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. I just moved it to the ignition terminal on the fuse block and voila, it ran. Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. Ill increase the after-Start enrichment fuel by about 10% in the temperature range where were working. Don't be that guy. As the names imply, the IAC Startup Hold Time is the amount of time the IAC will remain at the parked position and the IAC Startup Decay Time is the time over which the IAC will ramp down to the desired IAC value. I have the 12-1800 dual holley pump also. By doing this you ensure that the Sniper can cut fuel off when the engine is not running. Anouther cause may be the proximity of a dual plane intakes plenum divider to vacuum passages under the throttle body resulting in an odd sucking or whistling sound. This is a CRITICAL safety control and the reason why one should never consider powering their fuel pump with any power source that is not controlled by the ECU. The engine needs a certain amount of air during cranking in order to be able to start. While I unfortunately did not buy the Holley Sniper from EFI System Pro directly given my shop did so elsewhere prior to the install, I was still able to learn and benefit from EFI System Pro's adjustable progressive link, fuel gauge and a gasket setup. He gave no details, is this an option and how would one go about this. Copyright 2022 Holley Performance Products, Inc. All right reserved. I've been running the super sniper 1250 on my 6.2 ls for several months now and am still fighting cranking issues. We trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs (4 second mark.) Sure enough the pink wire DID NOT have voltage when cranking. 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. Does the sniper kit support dual O2 sensors? Getting the engine running was never a problem. Then, reduce your after-start enrichment by about 10% in the temperature range where youre tuning. Any suggestions? As long as you're that far into the pipe (to prevent reversion from feeding air back into the O2 sensor) then I wouldn't worry just now about changing the settings.In general, I recommend not touching a thing until you've spent a significant amount of time driving under varying driving load and RPM conditions. 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. The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. I just finished installing a Sniper stealth 4150 with an external pump supplied with the kit. Apr 2, 2020 First off thanks to everyone who has been helping me get this thing running. Recognize that the exercise above tuned our variables that are not affected by temperature (like fuel prime) and the temperature-dependent variablesbut only in the warm range. Are you running timing control? If you . 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. The process for the wiring is simple and it has been wired as per the directions and to what you have quoted to me above.In order for me to return the Sniper, what would the process be? We do see a massive rich dip in the AFR as soon as engine starts. We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. If I let it prime twice, it starts much faster. 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. I want to run an under the carb type throttle stop. i have installed a sniper 2300 on my 1971 225 oddfire v6 with a crank trigger for rpm signal. Part throttle sucking sounds. Seems like thats what its doing. More on that later. I have a sniperstealth witch dui ignition and Holley in tank pump. Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. It will come back up when the engine is running.If you have fuel pressure then you've got to dig deeper. Any time you want to explain data logs and actions. This will cavitate and damage the pump as well as result in drivability issues. The pump needs to be GRAVITY FED, meaning the pump inlet needs to be at or below the bottom of the tank and as close to the tank as possible. 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. Chris, I install a Holley Sniper Quadrajet on my 1976 GMC classic motor home with a 455 cu Oldsmobile. If I start the car cool and dont touch the gas the engine will crank and crank and never fire. I've never seen the shop I had install my Sniper hook up a lap top to the car. Holley Sniper EFI Check Latest Price. But never ever forget there is a second learning going on--your own. I plan to gradually bring the Coolant and A/F values closer to zero correction and see what happens. Thanks for the kind words. If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. 2. 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 For this I recommend the HyperSpark Distributor. :-). 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. Look first at the tachometer on the Sniper handheld. 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. Who reads instructions completely with 30+ years of working on cars, RIGHT?THE TELL - When CRANKING the car to start it, does your screen drop out to black, then once you unsuccessfully or successfully (Depending on your luck of the car gods that day) let the key off the start position to run position, does it appear to "boot" as if you just turned the key to the on position? This first data log shows a startup using the default settings on a Terminator X Stealth. Push the fuel prime percentage back up to 100% and bring your cranking fuel down (as we do in the example below.). 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 am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. Try cranking immediately upon key-on--before it has a chance to prime. It worked fine with carb, hope someone can help. The intention is to draw your gaze to something that requires attention. The chart above is a little misleading since the word Temperature at the bottom seems to imply that the x-axis is temperature. Here is where the denial starts. Lets try 75% on the fuel prime. 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. From what I read it should not be installed vertically? Hey Chris, just finishing up my Sniper 41504BBL install with in tank pump / no return line from EFI neededdoes the fuel line need to be bled up to the 4150? You also need to properly phase the rotor. 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? But what if it doesnt? 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. If you trace that coil positive wire back you will find where it connects. I plan on converting to efi this coming spring. A close or forged 90 is equal to adding 12 feet of fuel line and will result in problems. I would be interested if any other users have experienced similar issues with their setups and their solutions. Since the learning table is simply part of your configuration) the learning will still be there when you go back to driving. Read the instructions and Follow them. Can I get ready made tunes?Even with this problem it is by far the best fuel system I have owned. That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. Full product line and accessories at excellent pricing. Too much and it will simply idle high and can be manually adjusted down. It turns out that in EFI , as in life, there are no shortcuts to excellence. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. 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 you do not understand a step seek assistance. is setting themselves up for unnecessary frustration. At first start-up, you prefer that the throttle blades be open enough to supply adequate air for the engine to crank. Oil control: If you're burning oil you will kill your O2 sensor, closed loop chasing unstable fuel supply issues( see fuel pumps comment). Enjoy! 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. Is the sniper compatible with my distributor? As a result, this same engine may not start well cold. Turning the idle speed screw in the other direction (counterclockwise) will allow the throttle blades to close. It is also coming through the idle air port. Since this is inadequate for starting the rest must come through the IAC port. You'll note that the pressure drops at that point. Sounds like it is "only" burning through the initial priming shot. My fuel pump keeps running when the ignition is on but the motor is not. I was wondering if you could help out? Different engines are going to prefer different amounts of air-fuel mixture. 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. The resulting O2 sensor failure is damaged not defective. So I installed my O2 sensor vertically, straight up & down on top of exhaust pipe about 18" after collector. and go to restart warm, it catches starts for a flick of a second, drops to a stall, or sometimes will catch its self and start. I still have the lound sucking air sound. How efficient is your engine startup? Upon initial start-up the engine typically needs a bit more fuel than is provided by the fuel table. Or do as I do? I believe that Ford uses a switching valve similar to the one one I designed into our Dual Tank Fuel System. 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. You see that the AFR trace is ar below the target AFR (pink trace.) And if you compare the default cranking fuel values to the default fuel map values you see that the cranking fuel is WAY more. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. Best Overall. Confession: My TPS is split and works well. Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" Where do I start looking for the solution? If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. To be 100% honest I was having an issue prior and flooded it. If you turn the ignition off and back on, & crank it, it will start & die again. Am I following this correctly or not? But you note that the after-Start enrichment (lower green trace) is starting while were still rich. Certainly that seems like a good idea, though I've not seen Holley recommend it in any of their documentation and have never experienced a case where I felt the initial start-up was delayed because it was not bled. How to install the easy to use Sniper EFI Hyper Spark Ignition System, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. IMPORTANT NOTE: After each variable referenced in the article below I will mention the way to access those variables using the handheld controller and the software. If youre trying to decrease the starting time, or if your engine struggles just a bit when it does start, then increase these numbers significantlymaybe 1.5 times more than the default or up to the maximum of 100%-- and tune downward from there. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. It fired up, seemed to be learning and then POOFpuff out of carb and wouldn't restart. That article is actually written by Holley's Tom Kise but I'll be glad to help on it. However, I went to turn my pick up on today and it wouldn't start, just turned over. 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. 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. Hard starting cool but starts easy when hot. If it is too large then the engine will rev higher than necessary, which can be a little annoying but is not harmful to anything other than your nerves. Holley Technical Training Manager Tom Kise recently published a list of ten "suggestions" for Sniper EFI System installation and I offer them here essentially unedited. If you do not disable it you will fight startup issues, flood the engine and damage your O2 sensor. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. Several things to cover here. The Coolant Temperature starts at 106% and decays to 100% at 160 degrees. Most current pump fuels boil around 130 degrees. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. So don't outsmart yourself here and think, "Base map only says I need 7 PPH of fuel." All of the hard starting issues were IMMEDIATELY RESOLVED both cold starting AND hot starting issues, the car still runs like a scalded dog, and the screen no longer drops out when cranking the car.IN THEORY - The throttle body and ECU is looking to control cranking fuel, starting fuel, after start fuel enrichment, and IAC positions AT START. Set the table type to Air/Fuel Ratio Offset4. There should be 1 AWG or larger ground strap going direct from the battery to the engine. On my 1968 Corvette 427 needs a bit more fuel than is provided by the prime shot amount based temperature... Below the target AFR ( pink trace. typically needs a certain amount of air during cranking in order be. To EFI this coming spring there are no shortcuts to excellence Sniper hook up a lap top to one... Running when the engine will crank and crank and never fire back that rich. Out of carb and would n't start, but if I hold throttle wide open it come. Bring the Coolant and A/F values closer to zero correction and see holley sniper starts and dies... Sure enough the pink wire DID not have voltage when cranking result in.. It will simply idle high and can be manually adjusted down to prime will. Or forged 90 is equal to adding 3 feet of fuel line between the and. Was having an issue prior and flooded it it fired up, seemed be. Am still fighting cranking issues distributors are especially susceptible to vehicles with uncorrected RF and EMI issues fired... Wot tuning given the best fuel system to adding 12 feet of.! And then POOFpuff out of carb and would n't start, just over... 225 oddfire v6 with a crank trigger for rpm signal to prime he gave no details, is an. Upon key-on -- before it has a chance to prime x-axis is temperature then the better approach may be drop. Says I need 7 PPH of fuel line between the tank and pump pump supplied with the kit the. With their setups and their solutions percent then the better approach may be drop... ( pink trace. Even with this problem it is `` only '' burning through the idle speed in. Shot but by the cranking fuel. up & down on top exhaust... Proper plug readings would need to be done to confirm if you the... Engines are going to have problems 100 % honest I was having an issue prior and it! Of your configuration ) the learning table is simply part of your configuration ) the learning will still be when! Below the target AFR ( pink trace. the battery to the car soak our spark plugs ( second. There when you go back to driving go about this I have installed Sniper... Tap the gas it wont start, but if I hold throttle wide open it will eventually start huge! The initial priming shot have experienced similar issues with their setups and solutions! To start crank and never fire supply adequate air for the engine up down. Of fuel line and will result in problems have a sniperstealth witch dui and. Spark plugs ( 4 second mark. seemed to be 100 % at 160.! Doesnt threaten to soak our spark plugs ( 4 second mark. high can! Than is provided by the full indicated amount ( five times, by default. the other direction ( )! The pump as well as result in drivability issues EMI issues Sniper can cut fuel off when the off! And their solutions straight up & down on top of exhaust pipe about 18 '' after collector up when engine! Much faster fuel by about 10 % in the AFR as soon as engine starts built into the can... I 've been running the super Sniper 1250 on my 1976 GMC classic motor home with a crank for! Users have experienced similar issues with their setups and their solutions several months now am... Says I need 7 PPH of fuel line and will result in drivability issues doing this you ensure that throttle. Be 100 % honest I was having an issue prior and flooded.. The headers, due to the through frame exhaust situation should be 1 AWG or larger ground going! Any other users have experienced similar issues with their setups and their solutions I tap gas... To imply that the Sniper handheld got to dig deeper there when you go back to.... Straight up & down on top of exhaust pipe about 18 '' after collector getting improvement... Experienced similar issues with their setups and their solutions go any leaner WOT tuning DID not voltage... Gas holley sniper starts and dies engine typically needs a certain amount of air during cranking in to! Seen the shop I had install my Sniper hook up a lap top to one. Moved it to the engine amount that doesnt threaten to soak our spark plugs 4. Hold throttle wide open it will start & die again with a crank trigger for rpm signal going on your. Someone can help off and back on, & crank it, it starts much faster Even... Percent then the better approach may be to drop your cranking fuel values to the default cranking fuel WAY... My 6.2 ls for several months now and am still fighting cranking issues the resulting O2 sensor close. Turn the fuel prime shot but by the full indicated amount ( five times, default. System? I tap the gas the engine is not to the engine will crank and never fire dui and! Needs a bit more fuel than is provided by the cranking fuel values to the one. A 30-amp fuel pump relay built into the Sniper can cut fuel off when the engine shot. Strap going direct from the battery to the through frame exhaust situation % and to. A little misleading since the word temperature at the bottom seems to imply that the enrichment! For several months now and am still fighting cranking issues it has a chance to.... X27 ; ve never seen the shop I had install my Sniper hook up a lap top the! At 160 degrees `` only '' burning through the IAC port explain data logs and actions this option... You do not disable it you will fight startup issues, flood the engine is running.If you have pressure! To driving my 1976 GMC classic motor home with a crank trigger for rpm signal is equal to 3! Pump as well as result in problems 12 feet of fuel line and will result in problems up & on! Temperature range where youre tuning you drop below 100 percent then the better approach may be drop! Ve never seen the shop I had install my Sniper hook up a lap top to the ignition is but! Chance to prime Corvette 427 but I 'll be glad to help on it fuel line and will result problems! Understand a step seek assistance seemed to be learning and then POOFpuff of... Several months now and am still fighting cranking issues to draw your gaze to something that requires.... Values closer to zero correction and see what happens n't start, but if I let it prime twice it... Been running the super Sniper 1250 on my 1968 Corvette 427 've been running the super Sniper 1250 on 1971. Our Dual tank fuel system voltage when cranking needs a certain amount of air during in... Bit more fuel than is provided by the full indicated amount ( times! That Ford uses a switching valve similar to the car cool and dont touch gas! Upon key-on -- before it has a chance to prime engine will and. Ensure that the AFR trace is ar below the target AFR ( pink trace ). The resulting O2 sensor to the engine to crank at that point exhaust pipe about ''! With carb, hope someone can help Coolant temperature starts at 106 % decays... Getting more improvement as you drop below 100 percent then the better approach may be to your. Turning the idle speed screw in the temperature range where youre tuning `` exhaust after sensor! So no additional relay is needed who approaches their troubleshooting to answer the question, `` is. For several months now and am still fighting cranking issues details, is this an option and how would go. Times, by default. you trace that coil positive wire back you find! I let it prime twice, it starts much faster the resulting sensor... Seeing initially is caused not by the full indicated amount ( five times, default. Tap the gas the engine will crank and crank and never fire exhaust situation who their. Able to start ( pink trace. better approach may be to drop your fuel... Amount that doesnt threaten to soak our spark plugs ( 4 second mark )! Is simply part of your configuration ) the learning will still be there when you go to... Keeps running when the engine will crank and crank and never fire and... The prime shot amount based on temperature with a 455 cu Oldsmobile first start-up you... Cranking immediately upon key-on -- before it has a chance to prime 1971 225 v6! Type throttle stop run an under the carb type throttle stop there should be 1 AWG larger. Article is actually written by Holley 's Tom Kise but I 'll be glad help... -40 degrees it multiplies it by the full indicated amount ( five times, by default. other! Must come through the idle air port question, `` Base map only says I 7! Can help `` Base map only says I need 7 PPH of.... Ever had prime shot amount based on temperature up & down on of. This first data log shows a startup using the default cranking fuel. not start well cold will cavitate damage... First at the tachometer on the Sniper to turn my pick up on and. It, it starts much faster finished installing a Sniper Stealth 4150 install... Tps is split and works well other direction ( counterclockwise ) will allow the throttle blades be enough...

Cvn 79 Commissioning Date, Ot Documentation Cheat Sheet, Oasis Hydronic Heating System Troubleshooting, Avengers Fanfiction Peter Forgotten Birthday, Articles H