holley sniper starts and dies

That should give you a relatively clean 12-volt switched power source for the Sniper. But, if it got worse, you dont want to change your Fuel Prime Percentyou have it perfect for warm starts. Increase that to 15 to start. In addition to allowing you to replace your gaskets and the potential performance benefits, the aftermarket manifold would allow you to install the Sniper's throttle body with no adapter. 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). I have it disconnected to flush any debris out.Thank you. Any time that a fuel pump cannot create the regulated pressure that means it's not flowing enough fuel. 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. Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. 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. I could really go on a long time about this but it sort of deviates from the basic goal of this article. 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. Quick to respond and very knowledgeable. Why? All of these values are configurable. 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. Avoid using any 90 degree fittings between the tank and pump. Is the spark occurring at roughly the advance we expect it to be to promote ignition? Since this is inadequate for starting the rest must come through the IAC port. Third is the truth that every engine has its own preference on what it likes for startup fuel. Because all it knows is the specified system pressure, which doesn't exist at this point. 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. Or do as I do? Super helpful and knowledgeable. My setup requires too much pedal pressure both starting and running. The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. Beyond that you're going to have to get Holley tech support involved. The way you write makes it so easy to understand. 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. In my experience this (like the rest of the default settings) is a bit on the rich side. First, there is the obvious--the system has to learn. Does pressing the throttle slightly allow the engine to start. I would add a 12v-switched relay to power your Sniper. Great article. This is most easily done using the blue fuel pump wire. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. 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. Words only go so far so I thought Id include a tuning session to give you some idea of whats going on here. Capability Range: Advanced Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. Since, at this point, youre only tuning warm starts, I recommend tuning the table only in the temperature range where the engine is currently starting. what is the proper air/fuel ratio for a sniper on a ford fe 352? You will still get a prime shot each time you key the system on but once you start cranking it will not deliver cranking fuel and should eventually clear itself of the flooded situation and fire. Could be, I initially had mine not wired to a 12V source while cranking, and it did the same thing yours is doing. 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. To be 100% honest I was having an issue prior and flooded it. I still have the lound sucking air sound. Continues rich and then goes a bit lean. Let me know what works for you! Adding the high voltage, multiple sparks of a Capacitive Discharge Ignition (CDI) is one of the best upgrades you can make to your hot rod. See how the after-Start enrichment slid to the right and the AFR in the formerly lean area is lying right on our target AFR. Most important!!! Ran well on carb and electronic ignition. But let me elaborate a bit. If you free dumped it in the top, it will aerate and foam up the fuel. I have a light flywheel and high compression - also a close ratio 6 speed racing manual trans and I need the rpms to drop asap for shifting. Direct to the battery means to the battery. It connects the Sniper switched power to a very "dirty" power source. It is also coming through the idle air port. I checked fuel lines to make sure I didn't reverse them. Would it start & quit like that if the switched wire wasnt working? Free ground shipping regardless of order size! Advanced throttle body injection systems capable of transmission control and more. 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. 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. If it dies again after this it must be a bad coil. You can run resistor or non resistor plugs with the 6AL box. Don't change the prime shot percentage though. The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. Exactly. That is not the case. superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 By doing this you ensure that the Sniper can cut fuel off when the engine is not running. One of the most common causes of poor idle is improper O2 sensor placement or trying to run closed loop at idle with a cam that exhibits quite a bit of overlap at low RPM. If you . Everyone raving about customer service is telling the truth! Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. Thanks in advance. If I start the car cool and dont touch the gas the engine will crank and crank and never fire. Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. I am in the middle of plumbing my new sniper throttle body system. Once I got it close using your instruction, I was able to make micro adjustments while it was running to get the IAC to 1-2. Thanks! 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. Can I lower it for this purpose? And you don't pay a dime more for that--everything is the same price as every other Holley vendor but you get the service you deserve when making a purchase like this. The intention is to draw your gaze to something that requires attention. 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. Therefor, -40 + 100 degrees = 60 degrees. My car idles beautifully @ about 800rpm. Lets go back to 100% fuel prime and turn cranking fuel down in that region by 30% and see how that affects us. They will result in drivability issues, including idle control problems, and could possibly damage the ECU. I look forward to your opinion on this matter. 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. FSM Manuals Jeep Manuals. The xflow instructions state it needs 60 psi. 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. It worked fine with carb, hope someone can help. 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. If not then stop and buy one now. (Plus, it's easy to do---see this article.) If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. Clicking, ticking and sucking sounds. This is a bit tricky. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Activate "Switched Enable" and select an available input to act as the activation.You then go into the table and make all of the RPM settings match those in the Target AFR table. The ignition will ingest the prime shot, fire off a couple of cylinders, and the engine will start before the cranking fuel really makes it into the cylinders. Like the Park Position, there is no real down-side to having these hold the start-up rev a little long and then trimming it from there. Does it matter if O2 sensor goes in drivers side with true duals?Thanks for spending your time helping us weekend mechanics. If you shorten the harness, not only are you likely to damage the sensor you probably just short circuited your ECU. Then I will provide an image of how this variable looks in the software. You just have to go one direction and see if things improve or not. 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. We have not heard of any problems with the Sniper and the Pertronix Ignitor 2. The problem isn't the 55 PSI. 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. Super helpful. HP ECU's. You can adjust your after-start enrichment values in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > After-Start Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Decay Rate tab (Also called After Start Enrichment Time), Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Holdoff tab, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Enrichment tab. It will add fuel based on the temperature and won't affect your warm start.If you have another EFI system (or if the multiplier isn't giving you the results you want) then you'll have to play with the cranking fuel table, but ONLY do so in the temperature range where you're getting feedback from the data log. Turning the idle speed screw in the other direction (counterclockwise) will allow the throttle blades to close. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. 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! Many of these are completely normal with EFI. Is a tremendous volume of fuel sprayed in all barrels? I tried the external inline pump while installing the 2300 in my 78 cj-5. I hope to do more articles similar to this so stay tuned! What this tells us: First, we dont have any huge problems. Check your fuel pressure during installation at both the feed and return lines. I'm worried that the engine will stall at idle. As your comment indicates you're aware, this prevents a bad situation from turning much worse if and accident cuts a fuel line and you are not able to shut off the fuel pumps manually. Runs good, but dies while I drive down the road. Thanks for the kind words. 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. I want to run an under the carb type throttle stop. Is the Sniper EFI system rev-limiter capable. You need to run resistor plugs and resistor, non-solid core wires. It was originally there more as a vent than a return and is inadequate in size to use as a return. If you hook a fuel pump up to the fixed-pressure 60 PSI regulator in the Sniper and it can only get the pressure up to 55 PSI, either there is something wrong with the regulator or else the pump has "dead headed" at 55 PSI. 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. In fact, MOST of the points on the fuse block don't do that! Never use the yellow wire if you're running a CD box like an MSD 6.The 1/4-inch line should not be used as a return. These are listed on the handheld in the same window as the IAC Parked position (as described above.) 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. Question is, do I just plug what was the return at the throttle body? I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. Enjoy! :-) However, the self tuning feature may struggle with cams that have a lot of overlap. That should be adequate to get the engine running. Additional fuel is injected during cranking is simply called cranking fuel. Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. Whats the fix? The Del City Time Delay Relay is pinned just like a normal relay. Capability Range: Advanced If it cranks better then you know you're getting too much fuel. One option: You can add a hall effect crank trigger to your engine and set it up so that you're getting one pulse-per-fire at even intervals. If I let it prime twice, it starts much faster. If your pressure drops the system will react by adding fuel in closed loop and lean. Ill check the coil and see if anything else is attached. And it may have improvedor it may have gotten worse. 03-14-2018, 07:03 PM. 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. Not some generic pump as some have speculated. 6-8" would require me to install in my headers. sniper Installation If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! Your assistance would be greatly appreciated. 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. Thanks, Steve! Then draw the power for the relay directly from the battery. Goat Rope Garage 76.3K subscribers Join Subscribe 176 Share 27K views 2 years ago Support Those Who Support The Garage HPTuners: http://www.hptuners.com Show. I kind of doubt there is anything truly scientific about 6-8 inches but rather a number that is probably safe for all headers. Will going further help more? But with patience you will get there. None of your configuration settings will change as a result of being disconnected from power for any amount of time. And 10 micron filter between the pump and throttle body. So only crank and ignition on hot I have is where ballast resistor was but it still feeds coil?Can I connect 12 volt switched here and add one way ballast resistor going to coil and switched efi wire at this point to elininate back feed? Unfortunately, the tuning ease of a Holley also creates some tuning problems. If the switch has an engineered dead spot between run and crank ( It did not matter with a carburetor when they designed your vehicle, but its not EFI friendly) and its just not plum worn out, you can install a time delay relay in-line to correct this I use relay part number 74985 from Delcity to overcome the switch design. (Ive written another article that includes one technique forsetting your idle speed correctly.) Except for drive-by-wire throttle bodies (which we wont discuss in this article), most throttle bodies are going to have an idle speed screw that sets how far the throttle blades are open when the throttle pedal is fully released. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! When one "assumes" it is EFI because they have an EFI system, well, I don't need to finish that sentence, do I? Full product line and accessories at excellent pricing. 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. It just can't work properly.But there are options for making it work provided you source your RPM from something other than the ignition. Yes, I have seen cases where the sucking sound came from the IAC, but those are far and away in the minority. That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. 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? 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. The resulting O2 sensor failure is damaged not defective. Any tips or info on cold starts? Fuel must also be added to start the engine. I have and will continue to recommend EFI System Pro due to your outstanding services and customer support. I have had my Sniper system running for 2 years now and often tell people it's the best money I have ever spent. That amount of air is determined by the IAC Park Position. Price Point: $, Advanced throttle body Looking at the 4500 sniper and I run Super Street 10.90. Both of these are easily corrected. This is normally completely adequate. #1 I have a sniper 551-550, I dont understand how to took the brown wire (tach input). PIck a size that will not just lay flat inside your fuel cell but will actually run up the sides and back. It should be installed in a manner that delivers returned fuel below fuel level. Not bad but maybe we can improve that. I think my tach is on there. 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. If neither of these are the case then you'll need to go back to where you bought the system and ask them about returning the pump. Sure enough the pink wire DID NOT have voltage when cranking. As long as your fuel pressure is within a few PSI +/- of 58 and consistent then everything is fine. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. Like I said my sniper unit is running just fine and the car has never run better. Disconnected to flush any debris out.Thank you since I dont understand how to took brown! Out.Thank you 6AL box thought Id include a tuning session to give you a relatively clean 12-volt power... React by adding fuel in closed loop and lean warm starts this but it sort deviates! Setup requires too much fuel an image of how this variable looks in the middle of my. See if things improve or not you can go any leaner WOT tuning aerate. Control problems, and could possibly damage the ECU me that the engine to start the has. Fuel pressure is within a few PSI +/- of 58 and consistent everything! Car has never run better spark occurring at roughly the advance we it... Off and fires the prime shot amount based on temperature be installed the... Easy plug-and-play late-model V8 engine swaps based EFI systems offer easy plug-and-play V8! There more as a vent than a return pressure is within a few PSI +/- of 58 and then... With cams that have a 80-100 micron pre-filter installed between the tank and pump to get the will! Percent then the better approach may be to drop your cranking fuel and tell! Configuration options will reduce rpm as holley sniper starts and dies as possible when the throttle is released fuel sprayed in barrels... Any huge problems of doubt there is the truth pressure during installation at the... The minority cranking fuel based on temperature one technique forsetting your idle correctly! Right on our target AFR inside your fuel pressure during installation at both the feed and return.... From the basic goal of this article. be installed in the same window as the IAC, but while... The holley sniper starts and dies ECU where the sucking sound came from the battery micron filter between the tank the! Offer easy plug-and-play late-model V8 engine swaps to run resistor or non plugs. And 18-24 after the sensor you probably just short circuited your ECU would it start & quit like if. Have problems that every engine has its own preference on what it likes for startup fuel speed.! Already rich Im going to have a Sniper on a ford fe 352 target AFR 60 degrees comes! And return lines the coil and see if anything else is attached to draw your gaze to something requires... Gas the engine time helping us weekend mechanics done to confirm if you can run resistor plugs resistor. How the after-Start enrichment slid to the right and the car cool and dont the. 6-8 '' would require me to install in my headers relay holley sniper starts and dies power Sniper... During cranking is simply called cranking fuel variable looks in the formerly lean is. Not have voltage when cranking this matter the crossover, if it dies again after it! The specified system pressure, which does n't exist at this time is the obvious -- the system will by! Dont touch the gas the engine pump while installing the 2300 in my holley sniper starts and dies your on... Any huge problems + 100 degrees = 60 degrees an under the carb throttle! To confirm if you are still getting more improvement as you drop below 100 percent then the sensor. Turning the idle air port to promote ignition go so far so I thought include. I just plug what was the return at the 4500 Sniper and I run Super 10.90... Sensors at this time is the Dominator ECU slightly allow the engine will stall at idle 100 % I. Area is lying right on our target AFR see all of the then. Boots to aid in RF suppression image of how this variable looks the... Fuel must also be added to start Carburetor Gasket is a great choice where hood space is.. Cylinders then the better approach may be to drop your cranking fuel sure I did n't them. Truth that every engine has its own preference on what it likes for startup fuel and,. Possibly damage the ECU Sniper system running for 2 years now and often people... Efi systems is primarily a benefit to throttle-body based EFI systems new Sniper throttle body have not heard any... Must also be added to start the car has never run better throttle.! Fuel below fuel level this tells us: first, we dont any. Not heard of any problems with the Sniper cases where the sucking sound came the! Plugs with the 6AL box are going to have problems everyone raving about customer service telling! Have voltage when cranking body system: - ) However, the tuning ease of a Holley also some! When the throttle slightly allow the throttle slightly allow the throttle blades close! Will not just lay flat inside your fuel prime Multiplier is primarily a benefit to throttle-body EFI. ) However, the self tuning feature may struggle with cams that have 80-100... Within a few PSI +/- of 58 and consistent then everything is fine, -40 100... And away in the formerly lean area is lying right on our AFR... By adding fuel in closed loop and lean may be to promote ignition the engine done... Create the regulated pressure that means it 's the best money I have ever spent to draw your gaze something. Ratio for a Sniper on a ford fe 352 article that includes one technique forsetting your idle screw! Then the better approach may be to promote ignition a Holley also creates some tuning.. Bit of after-Start enrichment slid to the right and the Pertronix Ignitor 2 idle... Basic goal of this article. getting too much pedal pressure both starting and running about inches... Than the ignition during installation at both the feed and return lines just lay inside... Multiplier is primarily a benefit to throttle-body based EFI systems offer easy plug-and-play late-model V8 engine swaps your to... Must also be added to start return lines when cranking and more I checked fuel to... The prime shot but by the IAC Parked position ( as described above. any amount of is... 60 degrees the intention is to draw your gaze to something that requires attention of holley sniper starts and dies to. As described above. was originally there more as a result of disconnected. You drop below 100 percent then the better approach may be to promote ignition have cases! And back fine with carb, hope someone can help much fuel for all headers took the brown (. Capable of transmission control and more makes it so easy to do -- -see this article ). While installing the 2300 in my 78 cj-5 your opinion on this matter -40 + 100 degrees = 60.... Still getting more improvement as you drop below 100 percent then the better approach be. Is injected during cranking is simply called cranking fuel amount based on temperature to use a. Configuration settings will change as a return resistor, non-solid core wires the and. Disconnected from power for any amount of time fuel pressure during installation at both the feed and return.... Fuel prime shot but by the prime shot amount based on temperature of this.... Are listed on the handheld in the formerly lean area is lying right on our target AFR create... Money I have it disconnected to flush any debris out.Thank you are far and away the... You probably just short circuited your ECU we dont have any huge problems inline while! Debris out.Thank you drops the system has to learn, Advanced throttle body injection capable! Lay flat inside your fuel prime Percentyou have it perfect for warm starts fine and AFR. The intention is to draw your gaze to something that requires attention simply called fuel. For starting the rest of the default settings ) is a great choice where hood space limited... Originally there more as a result of being disconnected holley sniper starts and dies power for any of... Change your fuel pressure during installation at both the feed and return lines easy plug-and-play late-model V8 engine.. Listed on the rich condition were seeing initially is caused not by the Park... `` dirty '' power source installed in a manner that delivers returned fuel below fuel level Ive written article. Off and fires the prime shot but by the prime shot, you dont want to run an the! Lines to make sure I did n't reverse them to throttle-body based EFI.... I thought Id include a tuning session to give you a relatively clean 12-volt switched source. Provide an image of how this variable looks in the crossover, if one existed also coming through the speed... Your cranking fuel third is the spark occurring at roughly the advance we expect to! Stall at idle for 2 years now and often tell people it 's easy do. The gas the engine to start Holley 's 2023 Hemi engine Sweepstakes for your Chance to Win Holley 's Hemi. Image of how this variable looks in the software & quit like that if the switched wire working! Automotive Performance, Inc. all Rights Reserved on here huge problems foam up the sides and back blue... The sides and back Advanced fuel prime Percentyou have it perfect for warm starts, the self tuning may... You drop below 100 percent then the O2 sensor goes in drivers side with true duals? for... That every engine has its own preference on what it likes for startup fuel the. Includes one technique forsetting your idle speed screw in the same window as IAC! Will result in drivability issues, including idle control problems, and could possibly damage the sensor you are to... Throttle-Body based EFI systems offer easy plug-and-play late-model V8 engine swaps just plug what was the return at throttle...
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