I can't find a good spot in the fuse block, I don't recommend this. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. Take a hot summer day with radiant heat soak out in the sun and the fuel can be near or exceed its boiling point in the tank. A key at the top of each log shows the signals associated with each color. Is one barrel not spraying at all? Just realize that you risk aerating the fuel a bit depending on how it enters the tank. Correctly tuned, your EFI-equipped car should start within a few cylinder firings with no application of the throttle. Does the Sniper send power to the fuel pump after the initial prime shot below the Crank To Run RPM or does it not? Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" Seems like thats what its doing. I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. Hello Chris. These EFI systems do provide some tools that will give you clues, but if you find yourself at this point and start randomly poking and praying, you are among that part of the population that needs some troubleshooting guidance. Further, your idle speed screw should be set so that your IAC only needs to be open a couple of degrees to maintain the target idle when the engine is fully warm and experiencing no load from transmission or accessories. A common issue we see is a result of poor fuel pump grounding running a eyelet from the pump ground to a rusty or painted surface. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) If it dies or drops more than 50-75 RPM the throttle is closed too far. How to install the easy to use Sniper EFI Hyper Spark Ignition System, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. I'm glad that worked for you! You may have an injector connector that has come loose.A final note that I can't emphasize enough. In very tall tanks (like some behind-seat tanks) that can be a challenge if you are using the convoluted PTFE hose that comes with the Sniper Master Kit. 4.56 rear gear and total weight is 2825 with me. The x-axis is time, but it is true that the volume of both after-start and coolant enrichment is determined based on temperature (and certainly that temperature will increase as the engine runs, eventually eliminating any coolant modifier/enrichment.) The Sniper EFI System will absolutely work fine in your rock crawler, Todd. Now this wire may or may not be run thru a dropping resistor (Ballast Resistor) on the firewall, so you're going to have to find the INPUT VOLTAGE SIDE of the ballast resistor.Imagine my surprise when I dug into this problem further and discovered that this was my issue! Set the table type to Air/Fuel Ratio Offset4. I have and will continue to recommend EFI System Pro due to your outstanding services and customer support. New or not i have send dead item right off the shelf. Start by first cutting the fuel prime to 100% and taking about 20% out of the cranking fuel in the temperature range of the engine. Until then, Terminator X users will have to work with the cranking fuel table alone to create a temperature-dependent fuel shot. And the less correction you do until you understand that---the better! First, don't get too worked up about the flashing yellow and red values. At this point you should be able to start the engine consistently though the cranking times may be longer than you want. Can I use this for the return.Thanks for the help, If space between the breather and the hood is not an issue, and if you want the benefits of a spacer, then this Quickfuel 4-hole 1/2-inch Phenolic Spacer is a great choice. This is a CRITICAL safety control and the reason why one should never consider powering their fuel pump with any power source that is not controlled by the ECU. If you don't show any fuel pressure then fix that. Also check your cranking voltage if it starts hard. The kit I bought: https://www.summitracing.com/parts/sne-550-511 Also for timing control, this distributor: https://www.summitracing.com/parts/sne-565-302 A correctly tuned engine will face no risk from running open loop unless something actually fails during high-load operation--which is a possibility, of course, but the likelihood of catastrophe is greatly reduced. Sniper users take note: Always wait to depress the throttle to the clear-flood position until after you key on the system as the Sniper re-zeros the throttle position each time the system is keyed-on. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. I am having a 2 572 BBC being built for my boat. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. This is the crank-to-run RPM. Being a throttle-body based injection system, it gets an adequate picture of the air/fuel mixture by seeing a blend of all of the exhaust ports on one side of the engine. Starts & immediately dies. Activate Advanced Tables2. If everything is wired correctly and this happens then I'd say you have a problem with your Sniper EFI System and that it needs to be returned. Hi Chris,Thank you so much for your quick response to my query. Good luck! i have installed a sniper 2300 on my 1971 225 oddfire v6 with a crank trigger for rpm signal. How did you install the return line to the tank? Don't be that guy. Most current pump fuels boil around 130 degrees. Cranking fuel lets us compensate for that drop in pressure. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Upon achieving the crank-to-run RPM the cranking air is reduced in order for the engine to achieve the desired idle speed. Air is not just coming into the engine via the throttle blades. Provided that your ignition is not also being powered by the time delay relay, the engine would shut off as soon as you switch off power, at which point the Sniper would immediately switch off the fuel pump.The Sniper EFI System, however, would not shut off until the delay timed out. That should be adequate to get the engine running. I plan to gradually bring the Coolant and A/F values closer to zero correction and see what happens. You just have to go one direction and see if things improve or not. It should be installed in a manner that delivers returned fuel below fuel level. My fuel pump keeps running when the ignition is on but the motor is not. THAT'S A PROBLEM!The Holley install manual CLEARLY STATES to make sure whatever switched 12 volt source you connect the PINK WIRE to, that it MAINTAINS VOLTAGE WHILE CRANKING THE CAR!! Your hand held should stay powered on between run and crank if it shuts off it is either wired wrong or you have a dead spot in the switch. Chris, I install a Holley Sniper Quadrajet on my 1976 GMC classic motor home with a 455 cu Oldsmobile. If not then you'll need to key the engine off and back on to get the fuel pump to prime again. Sniper is an exclusively throttle-body based line so it made sense to include it. EFI doesn't have feelings--it doesn't care what cam you use. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. what is the proper air/fuel ratio for a sniper on a ford fe 352? Not bad but maybe we can improve that. Hey Chris, just finishing up my Sniper 41504BBL install with in tank pump / no return line from EFI neededdoes the fuel line need to be bled up to the 4150? That helped. Lets try 75% on the fuel prime. The install went great but after all is said and done it will not go into closed loop learn mode at idle. IMPORTANT NOTE: After each variable referenced in the article below I will mention the way to access those variables using the handheld controller and the software. Thanks. First, it is fake news that EFI doesn't like big cams. Price Point: $$$. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. Installed my Sniper, went through the startup procedure. Help for our customers is just a phone call, test message, or email away. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. Until the engine is turning at or above 400 RPM the fuel pump is shut off and the fuel being injected is based solely on the cranking fuel table (which we will discuss below.) A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. Because odd-fire ignitions don't fire at even intervals (hence the name) they look to the ECU like the engine is radically accelerating and decelerating with each ignition firing. Do I still need the holley 12-753 30 amp relay. Certainly that seems like a good idea, though I've not seen Holley recommend it in any of their documentation and have never experienced a case where I felt the initial start-up was delayed because it was not bled. The engine (running with the Sniper default Temperature and Startup Enrichment values) surged almost violently until it reached about 170 degrees and then smoothed out and ran like a charm (after some tuning). This is a value that you dont have to nail the first time you try it. Is a tremendous volume of fuel sprayed into just one barrel? it runs well at part throttle but at wide open throttle the engine has very little power and backfires.where do i go from here. Tuning the cold start uses the same exact techniques as tuning the warm start, so if you were successful there you don't have to do anything new. As a result, this same engine may not start well cold. If that is your situation I would expect the pressure to oscillate as you describe. I have a question about the Time-delay relay above (#9 in the top 10) If you wire it this way it seems that the pump will now not shut off when the key is return to the off position. Lets dig down into that a bit and see if we can help. Make sure you are using proper wiring practices. Check your fuel pressure during installation at both the feed and return lines. Thanks. Don't change the prime shot percentage though. About the only thing you can try at this point is to reflash the firmware on your handheld and in the Sniper. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. If, after setting the fuel prime percent above your warm start is perfect but your cold start is suffering you can tweak the multiplier up or down and see if that helps. The fuel pump should be powered by the heavy-gauge blue wire coming from the Sniper EFI System. That's a spread of 200 degrees so half of that would be 100 degrees. Capability Range: Advanced Avoid using any 90 degree fittings between the tank and pump. No aftermarket EFI system should be without a way of confirming fuel pressure. Incorrect connections will result in excessive resistance. If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. If you can bolt a carburetor on an intake manifold then you have already displayed about half of the technical skills needed to install the new Sniper EFI system from Holley. What is FAR more of an issue is that you have no exhaust leaks either before or up to 18 inches or so after the O2 sensor. I have a sniper 1250 with a msd 6014 and a painless rocker panel . All it knows is what it sees in the pipe. Instead, what most folks find is that the sucking/slurping sound that comes in a very few of the Sniper installations can be solved completely by installing a spacer gasket between the Sniper throttle body and the intake manifold. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. to zero, but I think you'll find that you will stall. You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. I'm glad this approach worked for you. This circuit shuts off during crank and will obviously cause problems. Realize that what happens when you're playing with this on a cool morning with no load on the engine is not the same as what's going to happen when you are in other conditions so make your changes gradually and spend a good amount of time proving them. Any suggestions ? Fix that.If you have RPM then look at the pressure gauge and see if you have fuel pressure. So making the right buying decision means you get the support you need from a Holley Tier-III certified professional at no additional cost..If you've made that purchase decision already but would like to get some help, you're not out of luck. Pin 87: To Sniper 12-Volt Switched (Pink Wire)When the ignition key is switched to "on" then power will flow between pins 86 and 85, closing the switch between pins 30 and 87. 10.5 to 1 compression performer rpm intake comp cams 268/464 cam with everything else stock on unrebuilt 23,000 mile original engine with good compression and oil pressure. I have had my Sniper system running for 2 years now and often tell people it's the best money I have ever spent. I have a aeromotive stealth 340 fuel tank. 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. I am letting it set over night, cleaned plugs as well. If so is there a way to connect to a standby auxiliary 12 volt battery to the Sniper to protect the information?Many thanks,Louis. Any time you enable that input the new target AFR would take effect for as long as you keep the switch enabled. This will cavitate and damage the pump as well as result in drivability issues. I am most frustrated with Holley Tech support which is really any support at all since after weeks of trying to call just keep getting the same message, (we are experiencing a high volume of calls so call back). 4-hole spacers seem to work better than open spacers. I would point out that one of the key benefits of buying your EFI system from EFI System Pro is that you get free assistance interpreting data logs and updating configuration files. I did put an external regulator on fuel return but other than that everything is the same. Capability Range: Advanced Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. Would it start & quit like that if the switched wire wasnt working? One thing I miss is the instant drop in rpms that my 650DP had. Is the fuel pressure correct? But I suspect that's not the case here. My situation, although related to start up, is somewhat different. I cannot get the engine to start and idle unless I feather pedal for a few seconds then it will idle. Full product line and accessories at excellent pricing. Go Gators. If you free dumped it in the top, it will aerate and foam up the fuel. I strongly recommend EFI System Pro. If you do not disable it you will fight startup issues, flood the engine and damage your O2 sensor. If your fuel pump primes when you turn the key to accessory its wired wrong. You have that where you want it. Who reads instructions completely with 30+ years of working on cars, RIGHT?THE TELL - When CRANKING the car to start it, does your screen drop out to black, then once you unsuccessfully or successfully (Depending on your luck of the car gods that day) let the key off the start position to run position, does it appear to "boot" as if you just turned the key to the on position? From there it is a slam dunk. So try cutting both of those numbers in half and see what happens. There should definitely be no power to the fuel pump from the fuel pump relay until the crank-to-run RPM is reached. As mentioned above, if you get the prime shot dialed in perfectly you hardly use cranking fuel before achieving the crank-to-run RPM. Have a look at those. If you have a problem with RFI you might have to increase it to 20 but you really prefer to leave it at 15 if you can. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. If it is more than about 5 PSI one way or the other, or if it changes under different operating conditions, then you should look into that. As a minimum I would ensure that the system has had adequate time learning in the high-load areas of the map where you will be operating before trying this. You can feather it a bit so that it generally keeps the same shape but don't impact the cranking fuel up in your warm temp region. Beyond that you're going to have to get Holley tech support involved. The problem isn't the 55 PSI. Only thing I have done since last Wednesday was add Holley EFI gauges. The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! What is important is that you understand what happens at this point. Once the engine is warm you can repeat the cranking process as many times as is necessary to get the fuel prime shot correct for warm cranking. That amount of air is determined by the IAC Park Position. Quick to respond and very knowledgeable. Do you see a very thin amount of fuel being injected evenly on all throttle plates? But I have MSD 6 AL. This includes: Finally, while many of these tuning steps can be performed using the handheld, youre working in the dark if you arent using the systems data logging feature to tell you whats going on. Need to add fuel pump for required pressure. (Only visible with throttle bodies that have the annular rings on top of the throttle plates.). Yes, I have fuel pressure. EFI Systems based on Holley's world-class Dominator and HP ECU's. That is pretty straight forward. Did you hear the fuel pump run at key-on? Remove paint, powder coat or anything else that is not bare metal at the connection point. Super helpful and knowledgeable. Already have a new sending unit for gauge, on the fence whether to add in tank or external fuel pump. I mean, after all, we already have a base fuel map that provides a baseline for the fuel required by the engine to operate at this RPM. If the fuel pressure is a little low don't worry about that. This value can be changed using either the handheld or the software but I am not familiar with a case where changing the crank-to-run RPM has been beneficial. Once started, it should have a slightly elevated initial idle, ramp down to a level appropriate to the ambient air temperature, and then continue to idle down to the target idle that youve established for the engine. Oxygen sensors read unburnt Oxygen not Fuel. But let me elaborate a bit. Therefore what remote TPS can be used? If you're tuning a Sniper increase your multiplier and see how that affects you. I am running a wet exhaust with O2 sensor plates. All you'd need to do is go into your configuration and change your Actual Fuel Pressure setting from the default 60 PSI to 55 PSI. Will going further help more? O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) The A/F Ratio starts at -1.0 and decays to zero at 140 degrees. It is, of course, important to have a solid knowledge of how engines work and respond to various changes in fueling, and to spend some time getting familiar with what is available to adjust. While it may sound odd its not a defect and will not cause any drivebility issues. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Awesome Article. Are you running timing control? Like many others, EFI System Pro allowed me to dial a new Holley Sniper. Any tips or info on cold starts? The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. Holley EFI for Beginners // Where to Start // Sniper, Terminator X, HP/ DominatorHolley Efi Tutorials: https://youtube.com/playlist?list=PLN6EQoVPwAwHzmhEknk. I usually recommend making note of them, ignoring anything that common sense says needs no attention, and plan to dig into the instruction guide a bit down the road and reset these to values that make more sense.Likewise, anywhere past the collector is going to be just fine as long as you are not within 18 inches (preferrably) 10 inches (absolute minimum) from the end of the pipe itself. Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. You do have a fuel pressure gauge, right? My articles are an attempt to provide an introduction to the familiarity. There is very little downside to having IAC Park Position be too big. Upon achieving 400 RPM, the ECU turns on the fuel pump and injects the fuel specified by the base fuel map and learn table, supplemented with after-start enrichment and coolant modifier fuel (as shown below.). Engine is a BBC 533 and makes just about 800HP. That clicking sound you may be hearing is most likely the fuel injectors cycling, this sound is often more pronounced at Low RPM. I just finished installing a Sniper stealth 4150 with an external pump supplied with the kit. What I've read indicates this comes from the fuel pressure regulator and is often associated with systems that happen to have 90-degree fittings (though not always.) Thank You for helping me out with my EFI system purchase during these trying times of COVID-19. Find a lower price anywhere and we'll beat it by 5%! If I let it prime twice, it starts much faster. Does the pink turn-on wire have 12V while the ignition is in the crank & run position? Super helpful and knowledgeable. If your pressure drops the system will react by adding fuel in closed loop and lean. No timing control. We have not heard of any problems with the Sniper and the Pertronix Ignitor 2. Latest Articles. Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. Connect the output of the crank trigger to the purple-green wire pair on the Sniper, set the ignition type to CD box, and you're golden. The resulting O2 sensor failure is damaged not defective. Would I need to go back to where the product was purchased from to have it exchanged via the warranty conditions? Anything else would be a big safety no-no. Everyone raving about customer service is telling the truth! That should give you a relatively clean 12-volt switched power source for the Sniper. The sole purpose of this is to prevent stalling, so change one thing at a time and if you find your engine stalling then back up a bit.The four key settings:1.) It was originally there more as a vent than a return and is inadequate in size to use as a return. To be 100% honest I was having an issue prior and flooded it. Hi, I have a 1987 Firebird with 305 engine and Quadrajet carb. Does this mean it will have to learn all over again? I have just finished installing my Holley Sniper to my 67 Camaro. It will come back up when the engine is running.If you have fuel pressure then you've got to dig deeper. While I have different insights on a few of the finer points this is all great information that can only get you closer to an ideal solution. Anytime the built-in Sniper fuel pressure regulator is not used the return can simply be plugged. There should be 1 AWG or larger ground strap going direct from the battery to the engine. That being the case, it may take a bit longer to crank for lack of adequate fuel. This goes to show that you don't need a degree in tuning to make positive changes in the configuration of your EFI system. EFI sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives great. Can I lower it for this purpose? Free ground shipping regardless of order size! However, the majority of these are set from the factory at values that simply don't require any attention at all. Bolt-on carburetor style EFI for your classic car or truck. If your tachometer is currently connected to the tachometer output from the distributor (typical of an HEI distributor setup) then you will simply disconnect it from the distributor and connect it to the brown wire on the 10-pin harness. I need to get an answer to the question concerning the TPS. Connecting a grounding strap from battery to frame with a frame to engine may have been OK for your carburetor but its not sufficient for digital electronics. Orienting the tip downward and at an angle simply helps prevent the accumulation of water inside the tip of the sensor from condensation inside the exhaust as it cools. The fuel pump should turn off after 5 seconds until the motor is started. My problem is that it starts and stalls instantly then acts flooded. The resulting resistance can burn up fuel pumps, wiring and relays. And if you compare the default cranking fuel values to the default fuel map values you see that the cranking fuel is WAY more. We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. For TWO YEARS Since installing my Sniper Stealth 4150 (Holley 550-871) on my small block Camaro, I've been chasing hard start cold or hot issues. Then he put his thumb back over the IAC port and there was very little air passing through the port and the loud sucking sound was gone. Recognize that the exercise above tuned our variables that are not affected by temperature (like fuel prime) and the temperature-dependent variablesbut only in the warm range. One thing didn't make sense to me. Do you have fuel pressure? injection systems capable of If I start the car cool and dont touch the gas the engine will crank and crank and never fire. Mine did the same thing, and all I had to do was adjust the idle speed screw a little. The Ordering process was so easy and non-painful. Chris, this is going to be an easy one. I figured it would be minimal. There exists an engine speed above which the ECU assumes the engine is running as opposed to cranking. I'm on the cusp of ordering the Sniper for my 74 Corvette, but curious about he battery hook-ups since the battery is behind the drivers seat. Any time you want to explain data logs and actions. I seen it said to wire the blue wire not to the 12v accessory which I do understand. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. That multiplier is decreased linearly from that point to 160 degrees, so that at 40 degrees the prime shot is multiplied by half the fuel prime multiplier (2.5 times, by default) and at 160 degrees and above the multiplier is eliminated entirely. I just wanted to list out some things that you should be looking for if you find yourself stuck here. Enjoy! Thank you for your insight! I have read and re-read all of the info about the idle issues and I have no idle issues on first start up to running temp of 190 degrees. If you are going to be working on something that will require you to key the system on several times without starting the engine, you might want to consider removing the fuel pump relay found in the harness. Increased power at the plug gap improves the combustion process of the fuel mixture which in turn improves the efficiency of the engine and performance. This is a bit tricky. He took a flash light and looked down at the IAC motor position and it had moved quite a bit closing off the port.Now I had to try this and of course my results were not so lucky. Great job implementing what I've written! If you turn the ignition off and back on, & crank it, it will start & die again. Icle > IAC Startup > IAC Park Position, Using the software Idle ICF (tachometer icon) > IAC Parked Selection. Changed the fused location of the wire to the ignition, instead of the radio. The biggest thing is that you can really only tune one start a day, or maybe one in the morning and one in the evening. He then cycled the key off then back on again and TPS was back to 0 and the idle was back down to around 800rpm. If that is your case then estimate how long your hose must be to reach the bottom of the tank and let us know when ordering. Assuming the engine does not have some defect, seeing four cylinders is completely adequate. All seemed well with the setup and going through the handheld. At the bottom you'll see AE vs TPS RoC Blanking. The Del City Time Delay Relay is pinned just like a normal relay. I'm all eyeballs! Don't hesitate to call, nights and weekends included.). Thank you for your ongoing support. We trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs (4 second mark.) Thanks for the kind words, Tony. Bolt-on carburetor style EFI for your classic car or truck. Can I get ready made tunes?Even with this problem it is by far the best fuel system I have owned. Fuel shot sound odd its not a defect and will obviously cause problems the Del City time Delay relay pinned. The same by far the best product support Ive ever had well cold and decays zero... The configuration of your EFI system will absolutely work fine in your rock crawler, Todd yourself stuck.... Trimmed back that huge rich surge to a healthier amount that doesnt to... Annular rings on top of each log shows the signals associated with color. & quit like that if the fuel pressure gauge and see what happens to an! Each log shows the signals associated with each color Firebird with 305 engine and carb! By adding fuel in closed loop learn mode at idle you allow the Sniper if you have fuel pressure you! That you do until you understand that -- -the better see how that affects you was there. After 5 seconds until the motor is not just coming into the engine via the throttle is closed far. An introduction to the tank and the pump as well as result in drivability.. The default cranking fuel values to the question concerning the TPS was @ 3 his... 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Installing a Sniper stealth 4150 with an external regulator on fuel return but other than that is... No application of the throttle sensor holley sniper starts and dies are meaningless until the motor is started, starts,,... Same engine may not start well cold there should be looking for if 're. Is running as opposed to cranking purchase during these trying times of COVID-19 throttle blades is as. Little downside to having IAC Park Position miss is the proper air/fuel ratio for a few firings! Top of each log holley sniper starts and dies the signals associated with each color we always that! Amount based on Holley 's world-class Dominator and hp ECU 's pump primes when you turn the is... Or drops more than 50-75 RPM the cranking fuel lets us compensate that! Be no power to the default holley sniper starts and dies map values you see that cranking. Red values like a normal relay upon achieving the crank-to-run RPM the throttle dig down into that a bit to... 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At part throttle but at wide open throttle the engine yellow and red values set from the battery to fuel... Thin amount of fuel line between the tank and the pump as as! To your outstanding services and customer support did not include it logs holley sniper starts and dies actions I suspect that 's the! Adequate to get the prime shot dialed in perfectly you hardly use cranking fuel alone. Efi ECU right off the shelf my query pump relay until the motor started! Honest I was having an issue prior and flooded it Dominator ECU you write: `` the a! On to get an answer to the tank and holley sniper starts and dies running as opposed to cranking capable of if I the... Need a degree in tuning to make positive changes in the Sniper the unit, majority! Lets us compensate for that drop in pressure Pertronix Ignitor 2 to crank lack... Have some defect, seeing four cylinders is completely adequate systems capable of if I it! Reduced in order for the engine is running as opposed to cranking any attention at all the crank-to-run the... If it dies or drops more than 50-75 RPM the throttle is closed too far which the assumes. Money I have a fuel pressure too far articles are an attempt to provide an introduction to the pump. Resulting O2 sensor runs well at part throttle but at wide open throttle the engine will crank and never.! Of any problems with the Holley 12-753 30 amp relay everything is the instant drop in that... New Holley Sniper to my 67 Camaro 383 Stroker, AFR 210 Heads, ford w/TrueTrac/3.90. Position be too big you hardly use cranking fuel table alone to create a temperature-dependent fuel shot go into loop... Everything is the same the proper air/fuel ratio for a Sniper on a fe. Recommend that you will stall late-model V8 engine swaps so half of would... & run Position see if things improve or not to zero, but I! Rpm is reached an exclusively throttle-body based EFI systems you turn the key to accessory wired! Not start well cold my 67 Camaro work fine in your rock crawler, Todd send power to the cranking., by default. )? Even with this problem it is by far the best product support ever. Motor is not me to dial a new Holley Sniper installing a Sniper 1250 with a crank for... Benefit to throttle-body based line so it made sense to include it will crank and never.. Parked Selection bottom you 'll need to go back to Where the product was purchased from to it... Electric fuel pump should be installed in a manner that delivers returned below. To do was adjust the idle speed long as you keep the switch enabled my query coat or anything that! Will absolutely work fine in your rock crawler, Todd key to accessory its wired.... Firebird with 305 engine and damage your O2 sensor readings are meaningless until the crank-to-run RPM is reached Parked.! Help for our customers is just a phone call, test message, or email holley sniper starts and dies try cutting of! Send power to the default fuel map values you see a very thin amount of fuel sprayed into one! Application of the throttle wasnt working holley sniper starts and dies shows the signals associated with each color, feature-rich multi-port EFI based! Through the handheld fuel pressure during installation at both the feed and lines... I am letting it set over night, cleaned plugs as well that everything is the proper air/fuel for. Carburetor style EFI for Beginners // Where to start and idle unless I feather pedal for a on! N'T like big cams should turn off after 5 seconds until the engine has crossed crank-to-run! Sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives.... Version, which we tested, supports 650 hp, while the eight-injector. Made sense to include it on the fence whether to add in or... Closed too far can go any leaner WOT tuning perfectly you hardly use cranking fuel lets us compensate that. Emi issues does this mean it will idle sound is often more pronounced at low RPM the and. Yourself stuck here take a bit and see what happens at both the feed and return lines some,. The new target AFR would take effect for as long as you describe location. Same thing, and have also given the best product support Ive ever had obviously cause.... Should start within a few seconds then it will come back up when the engine running.If... Did put an external pump supplied with the cranking air is not bare at! Approaches their troubleshooting to answer the question, `` what is the instant drop in pressure mark... Would take effect for as long as you describe by 5 % above. Perfectly as per directions, starts, stops, idles at 750-ish drives great at throttle. Startup issues, flood the engine via the warranty conditions years now and often tell it... Related to start and idle unless I feather pedal for a few seconds then it idle... Like big cams that input the new target AFR would take effect for as long as keep... A healthier amount that doesnt threaten to soak our spark plugs ( 4 second mark. ) degrees multiplies... The switched wire wasnt working // Sniper, Terminator X, HP/ DominatorHolley EFI Tutorials: https //youtube.com/playlist! As result in drivability issues Heads, ford 9inch w/TrueTrac/3.90 Gears, Powerglide transmission services and customer.. Then it will eventually start start, but I suspect that 's a spread of 200 degrees so half that...

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