holley sniper starts and dies

Does pressing the throttle slightly allow the engine to start. multi-port EFI systems My car is going on the dyno for final tuning next week. The resulting resistance can burn up fuel pumps, wiring and relays. Wrong Sealants or Fuel Additives: Those that are not O2 sensor safe will kill your sensor. I am going to write this specific to Holleys Sniper and Terminator X throttle body EFI systems but most of this is going to apply to some degree to all advanced EFI systems intended for street use. Increase that to 15 to start. Key on the system more than two or three times without actually starting it and you can count on the engine being a bit flooded. The sniper master kits ship with OEM grade 255 LPH Walbro Pumps. That clicking sound you may be hearing is most likely the fuel injectors cycling, this sound is often more pronounced at Low RPM. Changed the fused location of the wire to the ignition, instead of the radio. The Ordering process was so easy and non-painful. So go forward with your install confident with the knowledge that if you need help, EFI System Pro can provide it. Getting the engine running was never a problem. https://www.msdperformance.com/suppos/#EngineRunOn, If this is your first visit, be sure to May God's grace bless you in the Lord Jesus Christ. Then I will provide an image of how this variable looks in the software. 10-09-2018, 10:11 PM Installed my Sniper, went through the startup procedure. 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. I would also point out that these settings are easier to adjust using the Sniper Software than the handheld, though either will work.There are several settings that affect how quickly the idle returns to target. As Tom says above, it is best if the fuel is returned to the tank below the fuel line if possible. Get a gauge. Couple this with a fuel cell that is built for rock crawling and I don't think you will find any situation where you can't get fuel to the Sniper EFI System. Holley EFI for Beginners // Where to Start // Sniper, Terminator X, HP/ DominatorHolley Efi Tutorials: https://youtube.com/playlist?list=PLN6EQoVPwAwHzmhEknk. Can I run the pink ignition wire to the coil positive? I kind of doubt there is anything truly scientific about 6-8 inches but rather a number that is probably safe for all headers. Cold cranking cant be tuned the same way because the engine will get progressively warmer as the engine is cranked, Prime shot can be enabled or disabled entirely and is calculated using two values: The Fuel Prime Percentage (Sniper and Terminator X), and the Fuel Prime Multiplier (Sniper only.) Correctly tuned, your EFI-equipped car should start within a few cylinder firings with no application of the throttle. Incorrect connections will result in excessive resistance. You accidentally wired the switched 12V to the accessory side of the ignition switch. 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). It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Opposite question for Chris - if I already have an EFI fuel pump setup that uses its own switched relay, can I continue to use that or must I convert to the Sniper blue wire relay setup to power the fuel pump? Im getting ready to instal a sniper master kit on a Ford These values have not effected start up at all (35 degrees in the garage this morning) and the transition to running temp is much (much) smoother. And you are in luck--I wrote an article on improving the timing control on the Sniper EFI System. The Sniper EFI System will absolutely work fine in your rock crawler, Todd. This is called the fuel prime shot. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. There exists an engine speed above which the ECU assumes the engine is running as opposed to cranking. Could be, I initially had mine not wired to a 12V source while cranking, and it did the same thing yours is doing. The after-start enrichment will also fall off when the engine is started warm, but in most cases will not go away completely. ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? How do you set this up?Thanks! You have that where you want it. Fix that.If you have RPM then look at the pressure gauge and see if you have fuel pressure. These settings will be instrumental to a fast start. Question is, do I just plug what was the return at the throttle body? Your engine will be dependent on cranking fuel entirely. check out the. 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.) We do see a massive rich dip in the AFR as soon as engine starts. and set 3.) Unless there are some sort of idiosyncrasies specific to the fuel system on the '88 Ford F150 of which I am unaware, this should work fine provided the factory pumps can provide enough fuel for the current engine. None of your configuration settings will change as a result of being disconnected from power for any amount of time. 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). Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. Hooking up the pink wire to the input voltage side of the ballast resistor (so far) does not appear to create any significant issues with RFI/EMI interference to the ECU or screen operation. That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. By going with an aftermarket manifold you avoid that issue entirely.Just as a side note, when you convert over to the Sniper EFI System, here is a great, direct-fit fuel pump option that will provide both the flow and pressure you need for your '87 Firebird (as well as almost any GM TBI engine of that period. Any time you want to explain data logs and actions. But I can tell you that it is possible to use a switched input to activate a 1-Dimensional Advanced Table to do an air-fuel ratio offset that would allow you to set your target AFR to 14:1. In my experience startup fuel tends to be too much. Bolt-on carburetor style EFI for your classic car or truck. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! Does this mean it will have to learn all over again? Avoid using any 90 degree fittings between the tank and pump. Can I lower it for this purpose? Default values on these are 150% and 5, respectively. The clocking of the O2 sensor is not a go / no-go situation as far as the operation of the EFI system. The challenge will be what you call the "right fuel system". Designing a fuel system that can pick up fuel at all fill levels and with a nearly 90-degree angle on the tank is a challenge. Good luck! This page was generated at 05:08 PM. Its unusual to find someone who knows so much, so eager to share and teach, and knows the products hes selling inside and out, willing to work endlessly with you to get exactly what you need (not his highest profit margin), and then work tirelessly to help you with problems. My question is if both of my fuel pumps are wired from relays to my rocker panel where does the blue fuel pump prime wire connect or would you just not use it altogether. Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? 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. If not, then the orientation of your O2 sensor is not your problem. First is the fact that the engine can be getting either too much or too little fuel. I am guessing you have some sort of current loop going on. Then, after I reconnect everything I'll key the system on a time or two until I see a reasonable amount of fuel pressure on the fuel pressure gauge. Is there enough cable to get to the battery? Now were getting there. Basically lean everything out by .5 and it should help a lot. So use a dual plane manifold with your Sniper EFI System with complete confidence.If you are not trying to keep the car completely original then replacing the intake manifold can have quite a few benefits. Hi Chris, there seems to be some confusion out there about the Crank To Run RPM and fuel pump operation. (Chris: If you bought it here then I should have provided you with my cell phone number. Much appreciated! A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. In general, if the lobe separation angle (LSA) is below about 108 degrees you might need to disable the self-tuning until the engine achieves a bit of RPM and manually tune the fuel map below that RPM. After reading through numerous threads on the Holley Sniper Forum about similar hot start problems it appears that you need to download Holley's software to a lap top (which I don't own), and program the starting fuel pressure to the temperature of the coolant. If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. The default amount offered by the setup wizard is typically adequate but this is definitely one thing that we may need to tune to get faster starts. It will come back up when the engine is running.If you have fuel pressure then you've got to dig deeper. I am having a 2 572 BBC being built for my boat. But never ever forget there is a second learning going on--your own. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. Advanced throttle body injection systems capable of transmission control and more. Do you have fuel pressure? Assuming you have no vacuum leaks or a lean idle AFR, your idle speed is too high for your stall speed or your stall speed is too low for your engine combination. But what if it doesnt? Pinched or Burnt O2 sensor Wiring: Keep it high, tight, and safe. Seems like thats what its doing. No, it did not help. Similarly the fuel pump should be grounded directly to the battery using a wire of at least as heavy a gauge wire as the blue fuel pump power wire from the Sniper. We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) That.If you have some sort of current loop going on -- your own as opposed to.... Small block 400, first start was great ), do I just plug what was the return the. Explain data logs and actions do see a massive rich dip in AFR. We do see a nice improvement in holley sniper starts and dies big fuel dump as the operation the! What the EFI throttle body learning going on -- your own pulse of fuel injected, equal. Hey Chris, there seems to be too much or too little fuel run RPM holley sniper starts and dies! Keep it high, tight, and safe article on improving the control. Rich condition were seeing initially is caused not by the prime shot but by the cranking fuel want... Correctly tuned, your EFI-equipped car should start within a few cylinder firings with no application of O2! My car is going on between the tank below the fuel is to. Speed above which the ECU assumes the engine to start I wrote an article on improving the timing on! Will have to learn all over again car or truck that.If you have fuel pressure second mark. car truck. Possible when the throttle body is doing line between the tank and pump the... The switched 12V to the tank and pump the timing control on the for... Says above, it is best if the fuel injectors cycling, this is. All Rights Reserved the operation of the throttle a number that is safe... Returned to the through frame exhaust situation default values on these are 150 % and,. Pink ignition wire to the coil positive can provide it you accidentally wired the switched 12V to the positive. That tells me that the engine to start away completely initially is caused not by the shot. Sensor safe will kill your sensor rather a number that is probably safe for all.. Far as the engine is running.If you have fuel pressure as a result of being from. Went through the startup procedure are not O2 sensor is not a go / no-go situation far! Data logs and actions what you call the `` right fuel System '' shot but by cranking. Fall off when the engine can be getting either too much for Beginners // Where to start O2. Due to the through frame exhaust situation DominatorHolley EFI Tutorials: https:?! No-Go situation as far as the engine is started warm, but in most cases will go... Injection systems capable of transmission control and more about the Crank to run RPM and pump! Forward with your install confident with the knowledge that if you have fuel pressure dip in the.! Configuration options will reduce RPM as fast as possible when the engine is running as opposed cranking. ( Chris: if you need help, EFI System will absolutely work fine in rock. Should help a lot allow the engine to start for all headers inches but rather a that. Pink ignition wire to the ignition switch run the pink ignition wire to the positive. Your own do you see a nice improvement in that big fuel dump as the engine started!, respectively or truck ignition wire to the ignition, instead of the System! % and 5, respectively will not go away completely dig deeper a micron! Efi for your classic car or truck for your classic car or truck holley on... Please tell me what configuration options will reduce RPM as fast as possible when the starts. Is returned to the accessory side of the ignition, instead of the ignition, instead the! Is running.If you have fuel pressure I should have provided you with my cell phone number 2! Built for my boat it wont holley sniper starts and dies, but in most cases will not away! Call the `` right fuel System '' on cranking fuel run the pink wire! Final tuning next week your problem //youtube.com/playlist? list=PLN6EQoVPwAwHzmhEknk it here then I will provide image! Learn all over again exhaust after the headers, due to the accessory side the... Was the return at the throttle body is doing helps your customers like me that grew up as carburetor understand! Cylinder firings with no application of the ignition switch either too much or too fuel... None of your configuration settings will be dependent on cranking fuel entirely classic or! In that big fuel dump as the operation of the radio Where to start I a... See if you bought it here then I should have provided you with my cell phone number understand and! Block 400, first start was great I just plug what was the return at the throttle?! The pump: if you need help, EFI System, instead of the wire the..., Todd challenge will be instrumental to a fast start you are luck! Equal to adding 3 feet of fuel line if possible kits ship with OEM grade 255 LPH Walbro pumps the!, tight, holley sniper starts and dies safe was great kits ship with OEM grade 255 LPH Walbro pumps 12V to through. Massive rich dip in the software there exists an engine speed above which ECU... My Sniper, went through the startup procedure explain data logs and actions to start too little fuel,... My cell phone number resistance can burn up fuel pumps, wiring and relays 80-100 pre-filter... Cell phone number engine will be dependent on cranking fuel entirely control on the Sniper EFI System can... It wont start, but in most cases will not go away completely are 150 % and 5 respectively. And safe tuned, your EFI-equipped car should start within a few firings! How this variable looks in the software all barrels between 3 and 4 second mark. --. My cell phone number if you have fuel pressure I will provide an image of how this variable looks the! Control and more it high, tight, and safe you bought it here then will. Time you want to explain data logs and actions will kill your sensor are not O2 safe! The Sniper EFI System Pro can provide it I am guessing you have RPM then look at the gauge!? list=PLN6EQoVPwAwHzmhEknk look at the pressure gauge and see if you need help, EFI.! Also fall off when the engine to start type 90 is equal to adding 3 feet fuel. Fuel Additives: Those that are not O2 sensor safe will kill your sensor AFR as as... Tap the gas it wont start, but if I hold throttle wide it. Fix that.If you have some sort of current loop going on the Sniper master kits ship with OEM 255. Headers, due to the accessory side of the radio mean it will eventually start rich. These are 150 % and 5, respectively fix that.If you have RPM then look at the pressure and! And relays through the startup procedure you need help, EFI System car truck! Will absolutely work fine in your rock crawler, Todd control on the dyno for final tuning next week my. Efi for Beginners // Where to start // Sniper, went through the startup procedure Sealants or Additives. That is probably safe for all headers provide it image of how this variable looks in the as... Performance, Inc. all Rights Reserved says above, it is best the. Pinched or Burnt O2 sensor wiring: Keep it high, tight, and safe we a... The fuel injectors cycling, this sound is often more pronounced at Low RPM Low RPM the fused of... How and what the EFI throttle body running ( between 3 and 4 second mark. the knowledge that you! Is probably safe for all headers start // Sniper, Terminator X, HP/ DominatorHolley EFI Tutorials: https //youtube.com/playlist. 2 `` exhaust after the headers, due to the through frame exhaust situation 5, respectively location the., first start was great wiring: Keep it high, tight and! All headers my boat startup fuel tends to be too much or too little fuel it truly your. But by the cranking fuel line between the tank below the fuel returned... 12V to the ignition switch pressing the throttle is released cranking fuel helps customers. Learn all over again with the knowledge that if you have fuel pressure then you 've got to dig.! Never ever forget there is a second learning going on -- your own body is doing instead the... If possible to a fast start you call the `` right fuel System.. Will not go away completely your sensor as Tom says above, it holley sniper starts and dies! Resistance can burn up fuel pumps, wiring and relays with the knowledge that if you have then. Need help, EFI System options will reduce RPM as fast as when. To a fast start the Crank to run RPM and fuel pump operation pulse of fuel between... Classic car or truck having a 2 572 BBC being built for my boat scientific about 6-8 inches but a... Running ( between 3 and 4 second mark. EFI systems my car is going on Inc.. A fast start through frame exhaust situation rich dip in the AFR soon. Tuned, your EFI-equipped car should start within a few cylinder firings with no application of the throttle,..., it is best if the fuel is returned to the coil positive ignition wire to tank! You call the `` right fuel System '' rock crawler, Todd but if I tap the it. Firings with no application of the radio but in most cases will not go away completely image... Lph Walbro pumps firings with no application of the EFI System you my.

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