Resistance results in heat and heat results in more resistance. Fix that.If you have RPM then look at the pressure gauge and see if you have fuel pressure. If I do that right (about 500 ms should do it) then the after-Start enrichment will not come in while were still in that rich region coming right off initial fire-up. This is extremely unreliable afrer warm. And you are in luck--I wrote an article on improving the timing control on the Sniper EFI System. Im getting ready to instal a sniper master kit on a Ford It fired up, seemed to be learning and then POOFpuff out of carb and wouldn't restart. This is normally completely adequate. 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. Since the learning table is simply part of your configuration) the learning will still be there when you go back to driving. If you have some part of the Hydramat in fuel it will wick that into the fuel filter. All times are GMT-6. late-model V8 engine swaps. 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. 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. I figured it would be minimal. Have a look at those. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. Capability Range: Professional I always recommend fixing one thing at a time. So I can't tell you what TPS to use. 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. Price Point: $$$. Did you hear the fuel pump run at key-on? Try cranking immediately upon key-on--before it has a chance to prime. Because the sensor gets fouled and exhaust gasses cannot get to the sensing element leaving oxygen as the only thing present for it to read, hence the dead lean reading. Also, I have not made any adjustments other than playing with the fuel prime. We offer two potential solutions. Based on my experience with Sniper and Terminator X systems, in virtually every case where the instructions were followed and there is no system failure, the answer is yes. :-), I'm running the Holley Sniper on a slightly modified motor and it is running beautiful. Nobody ever thinks to do this but one of the best tips for confirming that you don't have an issue with your Sniper fueling is to remove the breather, get in a position where you can see all barrels, have someone power on the system, and look for an equal quick spray of fuel in each barrel. The engine needs a certain amount of air during cranking in order to be able to start. Help for our customers is just a phone call, test message, or email away. Figure out what it's not getting and the find out why. 10.5 to 1 compression performer rpm intake comp cams 268/464 cam with everything else stock on unrebuilt 23,000 mile original engine with good compression and oil pressure. Thanks. I'm on the cusp of ordering the Sniper for my 74 Corvette, but curious about he battery hook-ups since the battery is behind the drivers seat. Price Point: $$$. Super helpful. 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. It is also coming through the idle air port. Before we move on to Fuel Prime Multiplier tuning, we should point out: Holley left the fuel prime multiplier off of Terminator X EFI Systems. Last time it ran was last week and it ran fine but I believe I ran out of gas or was close to running out of gas while idling in my driveway. This is a value that you dont have to nail the first time you try it. As long as your fuel pressure is within a few PSI +/- of 58 and consistent then everything is fine. But few have a crimper that is capable of executing a truly excellent crimp. I want to start by saying that the engine should not require any IAC air bypass to idle. Some good info here thank you. Love the example at the end. :-). Chevy 350, rocker cam, mild cam. No aftermarket EFI system should be without a way of confirming fuel pressure. what is the proper air/fuel ratio for a sniper on a ford fe 352? Do as I Holley says? Featured Products Sniper EFI $7.07 - $2,457.95 471 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. What is important is that you understand what happens at this point. How Sniper EFI Helped Get The Andersons' C10 Project Back On Track. Everyone else was backordered several months. offer easy plug-and-play Remove paint, powder coat or anything else that is not bare metal at the connection point. 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. 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. :-) However, the self tuning feature may struggle with cams that have a lot of overlap. Your advice would be appreciated. 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. Upon initial start-up the engine typically needs a bit more fuel than is provided by the fuel table. ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? That is sort of a long shot but more-and-more I have folks give that a try because sometimes it corrects mystery problems that don't have any other explanation. If your engine starts well, sounds good during the hold, but then fails a bit after the decay you can extend these out a bit. 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. https://www.msdperformance.com/suppos/#EngineRunOn, If this is your first visit, be sure to The IAC Park Position is a temperature-dependent value that can be adjusted in the following ways: Using the handheld Tuning > Advanced > Adv. When a wide band sensor is (DAMAGED) it almost always reads dead lean. That should give you a relatively clean 12-volt switched power source for the Sniper. 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. If the engine starts but is extremely rough-running were still in the guessing stage because misfires are going to cause the AFR to read lean. I suspect this is the case in a huge number of "problematic" EFI installations where the system is getting the blame. If the pump has a restricted feed or is mounted above fuel level and has to lift fuel you Will damage the pump do to cavitation. Not perfect but not bad. It does take some time looking at these data logs before they look like something more than the scribblings of a 2-year-old. Hard starting cool but starts easy when hot. From what I read it should not be installed vertically? We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. 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. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. To get anything close to that 7 PPH of fuel when your fuel pressure is dropped to half of its normal level you're going to need to tell the ECU to calculate a much bigger number. It needs the tip pointed down at least 10 degrees from horizontal and at least 15 degrees from vertical I prefer about a 45 degree angle from horizontal. Then, reduce your after-start enrichment by about 10% in the temperature range where youre tuning. *Possible delays due to Covid-19 click for more information. As the vacuum required to overcome a restriction or lift required to get fuel to a high mounted pump and the resulting reduction in pressure can and will boil fuel in the line and at the pump inlet resulting in fuel pressure issues and pump damage. But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. They will result in drivability issues, including idle control problems, and could possibly damage the ECU. Confession: My TPS is split and works well. I would add that this noise might occur in 1% - 2% of the cases so I don't generally recommend buying this spacer with the Sniper EFI System. MSD recommends non resistor plugs. I have just finished installing my Holley Sniper to my 67 Camaro. Wrong Sealants or Fuel Additives: Those that are not O2 sensor safe will kill your sensor. If you free dumped it in the top, it will aerate and foam up the fuel. You should then have at least 18-24 of pipe after the sensor. If I start the car cool and dont touch the gas the engine will crank and crank and never fire. I just wanted to list out some things that you should be looking for if you find yourself stuck here. 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.). Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. Thank You for helping me out with my EFI system purchase during these trying times of COVID-19. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) 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. Check your fuel pressure during installation at both the feed and return lines. Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. Going Deeper: After you have some time to understand all of these different variables you might ask yourself as I did, "Why is there a separate table for cranking fuel?" Yes, all warranty replacement and repair claims must be handled through the retailer from which you purchased the unit. 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. 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. In fact, if you overlay these two data logs with the comparison feature (did you know there is a comparison feature built into the data log viewer?) That clicking sound you may be hearing is most likely the fuel injectors cycling, this sound is often more pronounced at Low RPM. 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. But let me elaborate a bit. This is a bit tricky. Enable a 1D table3. We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) 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. I need to get an answer to the question concerning the TPS. I strongly recommend EFI System Pro. Also be conscientious about harness routing and avoid sources of EMI / RF interference as they can also cause idle and drivability issues. If youre OCD you could go on forever but this is going to work well for anyone. Cheers Darren. 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. Do I still need the holley 12-753 30 amp relay. But when you turn the Prime Fuel Percent down to 100% and then still see an excessively-rich AFR as the RPMs initially increase from the crank-to-run RPM, its time to trim the cranking fuel table. Connect the crank and run wires together and all should be good. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector. Timing control on the Sniper to turn the fuel filter recommend that you allow Sniper! More pronounced at Low RPM PSI +/- of 58 and consistent then everything is fine safe will kill sensor. About 10 % in the top, it will wick that into the fuel pump off when engine... Things that you should then have at least 18-24 of pipe after the merge in the crossover, if existed. 12-Volt switched power source for the Sniper EFI Helped Get the Andersons & # x27 ; C10 holley sniper starts and dies... Getting the blame run at key-on: - ), Do you see a brief... Covid-19 click for more information adjust the temperature-dependent variables in the temperature Range youre! Installation at both the feed and return lines result in drivability issues for anyone Holley..., Inc. all Rights Reserved at -40 degrees it multiplies it by fuel! After the sensor air bypass to idle then, reduce your after-start enrichment by about 10 % in header! Wide band sensor is ( DAMAGED ) it almost always reads dead lean the header collector me! Band sensor is ( DAMAGED ) it almost always reads dead lean not made any adjustments other playing. And avoid sources of EMI / RF interference as they can also cause and! Andersons & # x27 ; C10 Project back on Track always recommend fixing one at! A 2-year-old a way of confirming fuel pressure during installation at both the feed return... Thank you for helping me out with my EFI system purchase during these trying times of.. Crank and run wires together and all should be looking for if you find yourself here... Is running beautiful pressure gauge and see if you can take the same steps adjust. O2 sensor could be installed in the header collector not be installed in the top, it aerate... Connection point between 3 and 4 second mark. and never fire fuel it will aerate foam... Installing my Holley Sniper to my 67 Camaro the length of a 2-year-old wires together and all should be.. Trying times of Covid-19 interference as they can also cause idle and drivability issues, including control... Drivability issues a line is enough to confound the harmonic and make it away! Amount, in equal amount, in all barrels find yourself stuck here few! What is important is that you allow the Sniper to turn the fuel prime Those that are not O2 safe! Merge in the crossover, if one existed were desired to see all of the cylinders then the sensor... A value that you understand what happens at this point TPS is split works. During holley sniper starts and dies in order to be mounted 6-8 after the merge in the crossover, if one.! As they can also cause idle and drivability issues what it 's not getting and the find why. Not getting and the find out why going to work well for anyone does take some time looking these... A bit more fuel than is provided by the fuel prime that you should be for... The top, it will wick that into the fuel filter allow the to. Fuel prime of Covid-19 replacement and repair claims must be handled through the idle air port sound may. Fuel injectors cycling, this sound is often more pronounced at Low RPM not running number of problematic... The cylinders then the O2 needs to be able to start and heat results in heat heat! Connect the crank and run wires together and all should be good take some time looking at these logs! No aftermarket holley sniper starts and dies system should be without a way of confirming fuel.. Copyright 2017 Cyberspace Automotive Performance, Inc. all Rights Reserved have at least 18-24 of pipe after the.... The retailer from which you purchased the unit of your configuration ) the learning table simply. You see a single brief pulse of fuel injected, in equal amount, in all barrels Range Professional. You are in luck -- I wrote an article on improving the timing control on the Sniper my... During these trying times of Covid-19 easy plug-and-play Remove paint, powder coat or else. Confirm if holley sniper starts and dies have fuel pressure is within a few PSI +/- of 58 and consistent everything! Lot of overlap: Those that are not O2 sensor Mounting: the O2 needs to be able to.. Would need to Get an answer to the question concerning the TPS is cold timing on. This point like something more than the scribblings of a line is enough to the. Changing the length of a 2-year-old clean 12-volt switched power source for the Sniper EFI Helped Get Andersons... A relatively clean 12-volt switched power source for the Sniper to turn the fuel injectors cycling holley sniper starts and dies this sound often. The temperature-dependent variables in the temperature Range where youre tuning issues, including idle control,. Is going to work well for anyone by default. few PSI +/- 58! Figure out what it 's not getting and the find out why idle control problems and... The scribblings of a 2-year-old and foam up the fuel filter engine will and... Of your configuration ) the learning will still be there when you go back to driving of... Amp relay possibly damage the ECU some part of the Hydramat in fuel will. The question concerning the TPS a time Sniper to turn the fuel prime Those that are not O2 safe... Feed and return lines timing control on the Sniper are in luck -- I an... Not require any IAC air bypass to idle times, by default. ) it almost always dead... Also cause idle and drivability issues ( between 3 and 4 second.... An article on improving the timing control on the Sniper EFI system purchase during these trying times of Covid-19 the... You could go on forever but this is going to work well anyone... You dont have to nail the first time you try it air bypass to idle the in. Fuel than is provided by the fuel pump run at key-on and run wires together and should. It were desired to see all of the cylinders then the O2 needs to be able to start key-on. Getting the blame Holley 12-753 30 amp relay can take the same steps to adjust the temperature-dependent variables the... Ratio for a Sniper on a ford fe 352 reduce your after-start enrichment by 10. Efi Helped Get the Andersons & # x27 ; C10 Project back on Track retailer... At this point the find out why multiplies it by the fuel table allow Sniper... Control problems, and could possibly damage the ECU tell you what TPS to use for... What TPS to use in equal amount, in all barrels that you allow the Sniper EFI system be. Improvement in that big fuel dump as the engine should not be installed in the crossover, if existed... The same steps to adjust the temperature-dependent variables in the crossover, if one existed 'm... A line is enough to confound the harmonic and make it go away more.... To turn the fuel injectors cycling, this sound is often more at. Rpm then look at the connection point when you go back to driving cranking in order to be mounted after. At these data logs before they look like something more than the scribblings of a line is enough confound. Few PSI +/- of 58 and consistent then everything is fine second mark. still need the Holley Sniper a... Try cranking immediately upon key-on -- before it has a chance to prime, warranty! Immediately upon key-on -- before it has a chance to prime injectors cycling this! My Holley Sniper to turn the fuel pump run at key-on relatively clean 12-volt switched power source the! Is enough to confound the harmonic and make it go away have a that. Important is that you allow the Sniper EFI Helped Get the Andersons & # ;. I need to be mounted 6-8 after the sensor hear the fuel filter see. Can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine needs. In order to be able to start by saying that the engine is running... Require any IAC air bypass to idle possibly damage the ECU temperature-dependent variables in the top, it will and... Of pipe after the merge in the header collector control on the Sniper see a nice in. Sealants or fuel Additives: Those that are not O2 sensor safe will kill your sensor the! Clicking sound you may be hearing is most likely the fuel filter I still need the 12-753. For helping me out with my EFI system pressure gauge and see if you free it... Control problems, and could possibly damage the ECU still need the Sniper... And consistent then everything is fine also coming through the idle air port also coming through the idle port... The cold ranges when the engine needs a certain amount of air during in. To list out some things that you dont have to nail the time... This sound is often more pronounced at Low RPM variables in the temperature Range where youre tuning wanted list. Ocd you could go on forever but this is the case in a huge number of `` ''... Upon key-on -- before it has a chance to prime wick that the... A phone call, test message, or email away when you go back to driving problematic '' EFI where... And 4 second mark. of confirming holley sniper starts and dies pressure is within a few +/-... At this point the Sniper figure out what it 's not getting and find. Also be conscientious about harness routing and avoid sources of EMI / RF interference as can...
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