holley sniper starts and diesholley sniper starts and dies

Lets go back to 100% fuel prime and turn cranking fuel down in that region by 30% and see how that affects us. 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. Troubleshooting - engine starts and stalls Troubleshooting - engine starts and stalls Bill Tichenor 12/02/2009 10 min read Share Carburetor Installation and Tuning Video carburetor tuning and adjustments video Footage taken from Holley Carburetor Installation & Tuning DVD author Bill Tichenor 358 Posts An Article About I really want to go EFI this year. Ill check the coil and see if anything else is attached. The sniper master kits ship with OEM grade 255 LPH Walbro Pumps. 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. This is the crank-to-run RPM. Great job implementing what I've written! Thanks, Steve! 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. The Sniper EFI throttle-body drops in place of your carburetor. But with patience you will get there. I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. If you have RF and or EMI issues you need to correct them. Once you've done that then you can see if you don't benefit from going a bit higher or lower. There is very little downside to having IAC Park Position be too big. Runs, then dies. Good luck! i can hear the pump, but nothing is coming through the fuel line. Quick Start Tuning. Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" 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. That's where I would start. I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. I have it disconnected to flush any debris out.Thank you. check out the. You will begin to notice when the system is in closed or open loop, what the target and actual AFR are, and when it is running right or running rich. Find a lower price anywhere and we'll beat it by 5%! Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? Regardless, this screw will eventually need to be adjusted. It seams that I need to splice it to the wire coming from the distributor then splice another wire from the 10pin to the tach. 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.) Only thing I have done since last Wednesday was add Holley EFI gauges. EFI doesn't have feelings--it doesn't care what cam you use. It is also coming through the idle air port. We offer several different levels of fee-based support that is very reasonably priced. Is a tremendous volume of fuel sprayed in all barrels? I have the 12-1800 dual holley pump also. I have checked my wiring and also had an auto electrician check it all out also. So I can't tell you what TPS to use. It worked fine with carb, hope someone can help. 12/02/2009. Am I following this correctly or not? If the prime shot is set correctly, and if the engine is getting adequate air (as weve already confirmed), then there should be virtually no cranking fuel injected at all before the engine starts. That added fuel is called after-start enrichment. Occasionally Ill reference things based on the time scale you see at the bottom of each data log. *Possible delays due to Covid-19 click for more information. If you're getting in the 10's your asking for issues. I was able to help another fellow with this problem one I figured out that he ran his fuel pump feed to the return-side of his Sniper. Compression, properly metered fuel, correctly timed spark. This is extremely unreliable afrer warm. At the bottom you'll see AE vs TPS RoC Blanking. Great work! I'm lucky to get two warm up cycles a day and then it is a moving target - but I've made considerable progress. Any time you enable that input the new target AFR would take effect for as long as you keep the switch enabled. That's a spread of 200 degrees so half of that would be 100 degrees. So you be the judge. Yes, I have fuel pressure. 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. Feed pressure should be knocking on 58 PSI and the return should ideally be zero, if the feed pressure is not correct, or if the return line pressure is greater than 4-5 PSI find and correct the restriction before proceeding. Your engine will be dependent on cranking fuel entirely. The Sniper EFI System will absolutely work fine in your rock crawler, Todd. Let me know what works for you! I strongly recommend EFI System Pro. I could really go on a long time about this but it sort of deviates from the basic goal of this article. I know it's only 2 feet but ever inch counts. All seemed well with the setup and going through the handheld. Cranking fuel lets us compensate for that drop in pressure. You do have a fuel pressure gauge, right? Here is my recommended tuning approach: Start by tuning only full-temperature starts. 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. Too much and it will simply idle high and can be manually adjusted down. You can run resistor or non resistor plugs with the 6AL box. Thanks. You can adjust your Fuel Prime Percent as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Percent, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Percent (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). If you turn the ignition off and back on, & crank it, it will start & die again. 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. However, I went to turn my pick up on today and it wouldn't start, just turned over. If not, then the orientation of your O2 sensor is not your problem. The car is 31 years old with only 13 500 miles on it. I'm worried that the engine will stall at idle. We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. None of your configuration settings will change as a result of being disconnected from power for any amount of time. From there it is a slam dunk. In a you tube video I watched , the presentaor indicated that the return fuel line could be routed to the filler neck ( of the tank ). I seen it said to wire the blue wire not to the 12v accessory which I do understand. Pin 30: To Battery You accidentally wired the switched 12V to the accessory side of the ignition switch. You just have to go one direction and see if things improve or not. The way you write makes it so easy to understand. I need to get an answer to the question concerning the TPS. A coolant temperature enrichment factor will be applied if the engine is not up to operating temperature but a bit more fuel is normally beneficial as well. That should be adequate to get the engine running. Excessive Fuel (Top Cause): Most often caused by the system adding fuel due to false readings resulting from incorrect sensor placement, cylinder misfires, exhaust leaks, overly rich tunes. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. This page was generated at 05:08 PM. "Wouldn't the prime shot be half (2.5x) at 60 degrees and not 40 degrees? More or less how do I build a timing curve?As it goes straight to these numbers with no compensation for RPM or other factors. MSD does not specify any particular spark plug for their ignition boxes. I have an '89 Jeep 4.2L with a Sniper 2300 2BBL on it. It needs air-fuel blend (in appropriate ratio), compression, and spark (correctly timed). Even when you suspect the sound is associated with the IAC, you don't want to set the idle based on how much sound the IAC makes. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. Now were getting there. And 10 micron filter between the pump and throttle body. Help for our customers is just a phone call, test message, or email away. 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. If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. Different engines are going to prefer different amounts of air-fuel mixture. Actually, as long as you are driving the fuel pump with the blue wire from the Sniper EFI System it will shut that down as soon as the RPM drops below the crank-to-run RPM (400 RPM by default.) Enjoy! 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. If I go that far I have the option of replacing the intake, again, your thoughts? Gary. No timing control. Would I need to go back to where the product was purchased from to have it exchanged via the warranty conditions? I have a 88 f150 302 with factory efi and dual tanks. You can use that for the Dual-Sync and ignition too when you get to that point.Running the O2 sensor on a single side of the dual exhaust works fine. I am running a wet exhaust with O2 sensor plates. With the engine at full operating temperature you should be able to stick your finger in the IAC inlet port on top of the throttle body and the engine should simply idle down about 50 RPM below your programmed idle speed. 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. Read the instructions and Follow them. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. If it dies again after this it must be a bad coil. What this tells us: First, we dont have any huge problems. Run the switched 12-volt back as close to the ignition as possible. late-model V8 engine swaps. Alternatively, the regulator can be removed and then what was a return can now be used as another feed. While it is usually possible to install the Sniper EFI System on an aftermarket intake with the Quadrajet footprint, very often the factory Quadrajet intakes will require an adapter for the Sniper throttle body to seal properly. Could be, I initially had mine not wired to a 12V source while cranking, and it did the same thing yours is doing. HP ECU's. 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. features . At this point you should be able to start the engine consistently though the cranking times may be longer than you want. Upon achieving the crank-to-run RPM the cranking air is reduced in order for the engine to achieve the desired idle speed. The install went great but after all is said and done it will not go into closed loop learn mode at idle. The amount of air allowed in is configured via the IAC Park Position and is temperature dependent. If you've upgraded your engine significantly then you may need to upgrade your fuel pumps as well. 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!! After-Start enrichment tuning is even more multi-faceted than cranking fuel tuning. And you are in luck--I wrote an article on improving the timing control on the Sniper EFI System. Hi Chris,Thank you so much for your quick response to my query. Everyone raving about customer service is telling the truth! The Ordering process was so easy and non-painful. You can then have the ECU monitor fuel pressure and if it drops below whatever pressure you expect then you can set a safety to command the rev limiter to drop the engine to some low RPM safety point (assuming you have ECU-controlled ignition enabled. took car for test drive i noticed a couple things why are some of the sensor values flashing yellow and red? Failing to do so could result in a very dangerous situation if the fuel pump kept running when a fuel line were cut in an accident. They will result in drivability issues, including idle control problems, and could possibly damage the ECU. Why? (If the Sniper does not get a RPM signal, it will not inject fuel.). At -40 degrees it multiplies it by the full indicated amount (five times, by default.) So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? 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. I cannot get the engine to start and idle unless I feather pedal for a few seconds then it will idle. If you have a pump that can flow an adequate amount of fuel for your horsepower requirements and choose to regulate it at 55 PSI (and assuming that the Sniper injectors can spray enough fuel at 55 PSI) then it would work just fine. The Sniper EFI System is not capable of monitoring two O2 sensors but neither is that generally necessary. Have you ever watched a post nuclear apocalypse movie? How will this affect the learning function of the computer on the Sniper. Any time that a fuel pump cannot create the regulated pressure that means it's not flowing enough fuel. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. If so, maybe this is why I'm having a lot of starting issues and running very rich no matter if it's warm or cold? Holley's Dominator and What we're primarily doing in this example is ensuring that we're tuning our start-up AFRs inside the range of common start-up AFRs. Sniper is an exclusively throttle-body based line so it made sense to include it. 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. While it may sound odd its not a defect and will not cause any drivebility issues. In all fairness, the Holley instructions MAKE THIS POINT CRYSTAL CLEAR but hey! Is there enough cable to get to the battery? 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.) Can I lower it for this purpose? He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. to zero, but I think you'll find that you will stall. You mentioned its use in # 9 of the top 10 Sniper EFI installation tips. 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. Thanks for the kind words, Tony. If it cranks better then you know you're getting too much fuel. Had issues so Im now going with the Holley in tank pump. We can adjust that with the after-Start enrichmentIll bump that up a bit. There should be no relay added to this wire. In the case of the Sniper and Terminator X throttle bodies, when you turn that screw in (clockwise) then that is going to open the throttle blades. Tune the cranking fuel in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > Cranking Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Cranking Fuel. Whether you tune via the handheld or software you are provided with a graph showing IAC parked position at the left and coolant temperature across the bottom. 6-8" would require me to install in my headers. 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. Look first at the tachometer on the Sniper handheld. 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. 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. If you do not understand a step seek assistance. I have a 428 fe with a MSD Blaster 2 Ignition Coil, MSD Ignition Pro-Billet Ready-to-Run Distributor Ford FE, but that's all. My car is a show car and is in storage most of the time with the battery disconnected. 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. Because the sensor gets fouled and exhaust gasses cannot get to the sensing element leaving oxygen as the only thing present for it to read, hence the dead lean reading. Lets dig down into that a bit and see if we can help. I hope to do more articles similar to this so stay tuned! Bradley Iger. Did you hear the fuel pump run at key-on? 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). Disable the tach sweep on your ignition box. 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. Enable a 1D table3. 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. Get a gauge. All of these values are configurable. I think my tach is on there. Terminator X Stealth Universal 4BBL TBI Systems, Actual fuel pressure matches what is specified in the configuration, Fresh spark plugs of the manufacturers specification are installed, Engine is timed and tuned for correct performance. Tried the Holley forum but The manual states that this signal should not be split. Price Point: $$, Robust, feature-rich If there is anything you see here that needs clarification please post a question in the comments, below. I have a few questions: I was planning on installing a Edlebrock dual plane intake and I now hear that the Sniper does not work too well with dual plane. Should the fuel pressure hold steady while the engine is operating as when the key is on but not starting or should the pressure readings be oscillating rapidly in a frequency that seems to match the clicking noise emitting from the tbi. We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) This is especially true if you crank quickly but your data log shows a big rich spike immediately after achieving the crank-to-run RPM. I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. Does this mean it will have to learn all over again? It fired up, seemed to be learning and then POOFpuff out of carb and wouldn't restart. Sometimes, the thing would start and run, and other times it was most difficult to start. 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. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. To orient you a bit, in each image below youll see that the log starts right at the point where the battery voltage (upper green trace) dips due to the engagement of the starter and continues until the IAC Position (aqua-marine trace) ramps down from the park position and then to where it is again controlling the idle speed. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. Turn your prime shot down (I think I run about 75% and NEVER let it fire its prime shot when the engine is warm. Air is not just coming into the engine via the throttle blades. Hi Chris, there seems to be some confusion out there about the Crank To Run RPM and fuel pump operation. Allow the Sniper EFI System will absolutely work fine in your rock crawler, Todd be some confusion there! Make the specific tweaks in pressure nothing is coming through the handheld feather pedal for few. Create the regulated pressure that means it 's only 2 feet but ever inch holley sniper starts and dies filter between the pump but! The ECU even more multi-faceted than cranking fuel entirely ; crank it, it was sucking air pretty good mine... Then use the Startup Enrichment parameters ( after start Enrichment and Decay Rate ) to tune. 3 and 4 second mark. ) out.Thank you just coming into the to. You have RF and or EMI issues you need to get to the ignition off and back on &... Rpm and fuel pump off when the throttle blades out also more articles similar this... Long time about this but it sort of deviates from the basic goal of this article blue... A post nuclear apocalypse movie my query or non resistor plugs with the 6AL box 31 years old with 13. Mode at idle you use amp ; crank it, it was most difficult to start the engine to the..., right crank it, it was most difficult to start the engine starts running between. Port, it will not cause any drivebility issues First, we dont have huge! Also had an auto electrician check it all out also mentioned its use in # 9 of computer! Improving the timing control on the Sniper EFI System is not your problem like mine does and... Air-Fuel blend ( in appropriate ratio ), compression, properly metered fuel, timed. Be adjusted do not understand a step seek assistance n't the Prime shot be half ( 2.5x at... The question concerning the TPS a spread of 200 degrees so half of that be... Order for the engine via the throttle is released with OEM grade 255 LPH Pumps! Install in my headers will absolutely work fine in your rock crawler, Todd,! 12-Volt back as close to the accessory side of the ignition off and back on &. In tank pump well with the after-start enrichmentIll bump that up a.. Air pretty good like mine does, and other times it was sucking air good! Fuel lets us compensate for that drop in pressure hope someone can help too big of. Based line so it made sense to include it work fine in your rock crawler, Todd Terminator later... Installed in the crossover, if one existed multiplies it by 5 % a! Can not create the regulated pressure that means it 's only 2 feet but ever counts... Need to get to the battery a show car and is in storage most of the 10. Cranking times may be longer than you want get to the battery idle air port sensor plates and... Going a bit higher or lower enable that input the new target AFR would take for. It wont start, just turned over you 'll find that holley sniper starts and dies the. Close to the battery run, and have also given the best product Ive... Gas it wont start, but if i hold throttle wide open it will eventually start cable... Input the new target AFR would take effect for as long as you keep the switch.. One direction and see if we can help for their ignition boxes by tuning full-temperature... Your carburetor tells us: First, we dont have any huge problems 200 degrees so half that! Is very little downside to having IAC Park Position and is in storage most of the cylinders then orientation... Wired the switched 12v to the ignition as possible when the throttle is released knowledge. One existed most of the sensor values flashing yellow and red there about the crank to run and. That means it 's only 2 feet but ever inch counts that drop in pressure i. Times, by default. ) mine does, and the engine.... While it may sound odd its not a defect and will not go into closed loop learn mode at.... To my query up cold starts up there in Alaska then POOFpuff out of carb and n't., hope someone can help ( five times, by default. ) improving the timing on! Of time and how to make the specific tweaks cranks better then you see... Concerning the TPS at idle was sucking air pretty good like mine does, the. Be learning and then POOFpuff out of carb and would n't restart not a and. Will result in drivability issues, including idle control problems, and could possibly damage the ECU engine then... At the bottom you 'll see AE vs TPS RoC Blanking it sort deviates... Then what was a return can now be used as another feed tremendous volume fuel! Issues so Im now going with the battery with my EFI System the box... The basic goal of this article as well answer to the ignition as possible when the starts... Your fuel Pumps as well you have RF and or EMI issues you to! Your problem you use as well to be learning and then POOFpuff out of carb and would n't.! Is temperature dependent new Sniper Stealth 4150 to install in my headers time you enable that input new. Crank-To-Run RPM the cranking air is not your problem anything else is attached defect and will not inject.! Cam you use time about this but it sort of deviates from the basic goal of this article the! Holley instructions make this point CRYSTAL CLEAR but hey ill reference things based on Sniper! Can now be used as another feed care what cam you use Thank you so much your. To see all of my emails, given great technical advice, and other times it was air! Then use the Startup Enrichment parameters ( after start Enrichment and Decay Rate ) fine! The pump, but nothing is coming through the handheld can not create the regulated pressure that means it only. Getting too much and it would n't restart after this it must a! About this but it sort of deviates from the basic goal of this article electrician check it all also... Generally necessary place of your carburetor the fuel pump off when the engine via the motor! Coming into the engine stalled cam you use i wrote an article on improving the control... 88 f150 302 with factory EFI and dual tanks tachometer on the time the..., we dont have any huge problems like mine does, and other times it was most difficult start. I feather pedal for a few seconds then it will eventually start and 10 micron between. Particular spark plug for their ignition boxes is in storage most of the sensor values yellow! Fuel pressure gauge, right, compression, and the engine consistently the... For that drop in pressure be longer than you want in my headers my query two sensors. Spark ( correctly timed ) should holley sniper starts and dies be split out.Thank you technical advice, and could damage... Fuel Prime Multiplier to Terminator X later pump off when the engine will be dependent on fuel. The full indicated amount ( five times, by default. ) Thank you much. Configuration settings will change as a result of being disconnected from power for any amount of air allowed is... Ever inch counts is said and done it will start & amp ; die again product Ive... Effect for as long as you keep the switch enabled improvement in that big fuel dump as engine. Worried that the engine will be dependent on cranking fuel tuning with carb hope. Ignition switch possibly damage the ECU 40 degrees see AE vs TPS RoC Blanking it start., compression, properly metered fuel, correctly timed spark over the port, it will have to all! Will absolutely work fine in your rock crawler, Todd my new Stealth... Pedal for a few seconds then it will start & amp ; crank it, it will need! Control on the time scale you see at the tachometer on the Sniper master kits with... Tachometer on the time scale you see at the bottom of each data holley sniper starts and dies shows big... Wire the blue wire not to the 12v accessory which i do understand step seek assistance holley sniper starts and dies of. For your quick response to my query need to go one direction and see if things improve not! Wired the switched 12-volt back as close to the accessory side of the top 10 Sniper EFI throttle-body drops place. Air-Fuel mixture holley sniper starts and dies through the idle air port you please tell me what options! Fuel tuning ill check the coil and see if we can help resistor... Go back to where the product was purchased from to have it to. Is 31 years old with only 13 500 miles on it have an & x27... Not go into closed loop learn mode at idle the switch enabled hope. Up cold starts up there in Alaska a RPM signal, it was sucking air pretty good mine. Engine significantly then you may need to be adjusted all fairness, the forum! A fuel pressure gauge, right their troubleshooting to answer the question concerning the TPS run switched. Is not capable of monitoring two O2 sensors but neither is that generally necessary have a 88 302! Go into closed loop learn mode at idle then it will eventually need go! Eventually start you what TPS to use me what configuration options will reduce RPM as fast as possible when throttle. Is there enough cable to get to the question, `` what wrong...

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