The fuel pump should turn off after 5 seconds until the motor is started. Digital electronics like clean stable voltage. EMI is what wipes out all the electronics. A key at the top of each log shows the signals associated with each color. It is going on a 1966 coronet with 1964 413 wedge. I have it disconnected to flush any debris out.Thank you. Where do I start looking for the solution? I have a sniperstealth witch dui ignition and Holley in tank pump. But, even then, I would expect that the fuel management system will get fuel to and from the Sniper just fine. If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. So if the +12 Volts "goes away" during the crucial start cycle the EFI ECU is essentially "Brain Dead" seemingly at this point. While it may sound odd its not a defect and will not cause any drivebility issues. Help for our customers is just a phone call, test message, or email away. Have you ever watched a post nuclear apocalypse movie? 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. If you jump in the car, insert the key and in the same move start cranking, you will not get a fuel prime. Direct to the battery means to the battery. Most import. Good point. Many of these are completely normal with EFI. We trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs (4 second mark.) If it shows "Stall" instead of showing an RPM while you are cranking then you've lost your crank signal. Had issues so Im now going with the Holley in tank pump. It starts fairly well. This is a huge improvement over what we got initially. 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.) 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! Then draw the power for the relay directly from the battery. But what if it doesnt? I won't buy anywhere else. check out the. I've been running the super sniper 1250 on my 6.2 ls for several months now and am still fighting cranking issues. These EFI systems do provide some tools that will give you clues, but if you find yourself at this point and start randomly poking and praying, you are among that part of the population that needs some troubleshooting guidance. That delay is called After-Start Holdoff. I'm thinking now that I'm fixing something that's not broke ( my reasons for the purchase is, I stink of fuel and i have no choke so have to wait for the engine to get up to temp before i can drive it. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. Is the Sniper EFI system rev-limiter capable. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. I call this the Happy Dance moment. I have been looking at all efi units and I keep coming back to the Sniper. Price Point: $$, EFI Systems based on These are listed on the handheld in the same window as the IAC Parked position (as described above.) 03-14-2018, 07:03 PM. Would appreciate your input. I like to have the idle area of the fuel map about 14:1, the cruise area about 14.5:1 and the WOT area about 13:1. Also, if you have the IAC inlet plugged off and the throttle angle is set to your desired idle speed and it dies when you put it in gear with an automatic. But with patience you will get there. Here is my recommended tuning approach: Start by tuning only full-temperature starts. This page was generated at 05:08 PM. You see the battery voltage dip followed by the RPM (bright red trace) appearing from the bottom of the log at the point at which the ECU syncs to the crank signal. Pinched or Burnt O2 sensor Wiring: Keep it high, tight, and safe. But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. Super helpful and knowledgeable. Power glide with 1.80 first gear, 6,200 converter. But you can extend the leads using wires of an equal or heavier gauge. Car ran great prior to SNIPER install with 750 holley single pump single feed SAME radiator but since have upgraded to dual 11 fans 4400 cfm up from twin 10 at 3500 cfm. I am guessing you have some sort of current loop going on. While I reference the target AFR here I purposely don't call out the value. Need to add fuel pump for required pressure. You're not running your EFI system without a gauge are you? The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. Just make sure you do not have a vacuum leak between the TBI and the intake as this will result in a multitude of idle and drivability issues. The fuel pump should be powered by the heavy-gauge blue wire coming from the Sniper EFI System. 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. This circuit shuts off during crank and will obviously cause problems. If you have some part of the Hydramat in fuel it will wick that into the fuel filter. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. Is this normal? The amount of air allowed in is configured via the IAC Park Position and is temperature dependent. 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. If I let it prime twice, it starts much faster. :-). It connects the Sniper switched power to a very "dirty" power source. Any help with this would be greatly appreciated.Gary. 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. Is a tremendous volume of fuel sprayed into just one barrel? Thanks. I know it's only 2 feet but ever inch counts. I am letting it set over night, cleaned plugs as well. Hi Chris,Thank you so much for your quick response to my query. Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" Basically lean everything out by .5 and it should help a lot. O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) Free ground shipping regardless of order size! Don't change the prime shot percentage though. 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. At this point you should be able to start the engine consistently though the cranking times may be longer than you want. Nor can I really recommend that you split it as I have. It drains the battery almost dead then will fire up. 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. I really would like to replace the intake gaskets. 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. Thank You for helping me out with my EFI system purchase during these trying times of COVID-19. And I've helped my share of folks with fuel pumps in empty gas tanks. 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. In fact, they may be terrible values when applied to your engine. 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. 3.) This is called the fuel prime shot. Engines require three things to run. The main thing is that you want to use the blue fuel pump wire as a 12-volt trigger for both of the fuel pump relays. I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. Fires up & runs perfect. 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. Find a lower price anywhere and we'll beat it by 5%! There is a correct setting for the idle and it sound should not be a consideration. That is not the case. 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. The engine needs a certain amount of air during cranking in order to be able to start. Sniper is working pretty well after using your idle setting procedures. A low air to fuel ratio means the mixture is rich. Capability Range: Advanced 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. Set the X Axis to RPM5. I prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually superior. 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! 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. Hi I am running a Hyperfuel pump part #40019 with a 58 psi regulator built in to the pump am I safe to run this with my holley xflow or should I be removing the fuel pump regulator and installing one on the return line? If you're getting in the 10's your asking for issues. While it is true that, ultimately, all of the 12-volt switched power sources are connected at some point, distance is your friend. ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. More on that later. In virtually all cases, this will be more than the amount of air it needs to idle. 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. Compression, properly metered fuel, correctly timed spark. Some good info here thank you. Do you get an RPM reading on the handheld while cranking? Too little opening and the engine risks not having enough air to start. Could be, I initially had mine not wired to a 12V source while cranking, and it did the same thing yours is doing. 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. 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. A throttle linkage extender and a progressive linkage kit. I plan to gradually bring the Coolant and A/F values closer to zero correction and see what happens. Note that while you can see an air-fuel ratio trace (sort of rust-colored) all the way across the data log that value is not to be trusted until the engine is consistently firing on all cylinders, roughly the point of the crank-to-run RPM or a bit after. I Had a holley sniper on this car with no issues whatsover. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. took car for test drive i noticed a couple things why are some of the sensor values flashing yellow and red? Price Point: $$$. Im getting ready to instal a sniper master kit on a Ford Yes, there should be a steady flow of fuel out of the return. I would add a 12v-switched relay to power your Sniper. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector. 2-Barrel Sniper EFI 2300 Sniper EFI C10. While setting the cranking air is simple (add a bunch and then tune it back where it doesnt over-rev) setting the cranking fuel is a bit more challenging. Yes, ensure the Sniper EFI switched +12V pink wire is powered in the "Run". Again, provided that you don't have anything else powered by the time-delay relay, that really only means the the Sniper display would stay powered for the few seconds that it is supported by the relay, and then it would shut off as well. I am running a wet exhaust with O2 sensor plates. Each time you key on the system longer than the four seconds or so that it takes to deliver the prime shot, a prime shot will be delivered. The sniper master kits ship with OEM grade 255 LPH Walbro Pumps. 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. Did your engine start the first time you turned the key after installing your EFI system? After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. Why? But I suspect that's not the case here. Maybe I am missing something here. If it dies add fuel right away thru the carb opening a few drops at a time if it runs its the fuel pump. Start by going after the fuel prime shotthe amount of fuel injected into the engine before cranking begins. Once you determine how much you adjust the cranking fuel in the warm range you can either leave the rest of the range alone to see how it starts cold or else just adjust the entire cranking fuel table by the same amount that youre using to create an efficient warm start. Please continue to write these type articles as they are invaluable to your customers. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. You see that the AFR trace is ar below the target AFR (pink trace.) If you're tuning a Sniper increase your multiplier and see how that affects you. 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. Thats what we want, right? The xflow instructions state it needs 60 psi. A couple of questions to ask yourself: Remove the air cleaner and have someone key the system on while you look down the throttle bores. Fyi both fuel pump rocker switches have momentary primes. it runs well at part throttle but at wide open throttle the engine has very little power and backfires.where do i go from here. 6-8" would require me to install in my headers. You can run resistor or non resistor plugs with the 6AL box. They are the only ones got me a holley usb to can cable fast. Price Point: $, Advanced throttle body Back to holley.com . Like many others, EFI System Pro allowed me to dial a new Holley Sniper. Connect the output of the crank trigger to the purple-green wire pair on the Sniper, set the ignition type to CD box, and you're golden. ), In my ongoing quest for knowledge prior to installation, I have another question. I could really go on a long time about this but it sort of deviates from the basic goal of this article. Both of these are easily corrected. But as the temperature decreases the IAC Park Position (and therefor the air allowed to pass) increases, all the way to wide open (100%.). Hi, I have a 1987 Firebird with 305 engine and Quadrajet carb. None of your configuration settings will change as a result of being disconnected from power for any amount of time. Nice catch, Ken! Here is where the denial starts. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Add fuel right away thru the carb opening a few drops at a time if it dies add fuel away... Rpm while you are cranking then you 've lost your crank signal change. Go any leaner WOT tuning a correct setting for the relay directly from the Sniper just.. A wet exhaust with O2 sensor plates to confirm if you have some sort of deviates from the goal... Sbc ), i have `` exhaust after the headers, due to the EFI. None of your configuration settings will change as a result of being disconnected from power for the idle and sound. That you split it as i have it disconnected to flush any debris out.Thank you have holley sniper starts and dies exhaust between... Terrible values when applied to your engine start the first time you turned the key after installing your EFI with... Intake gaskets other than the amount of air during cranking in order to be mounted 6-8 after headers... N'T call out the value of time i have a relatively restrictive 2 `` after! Grew up as carburetor tuners understand how and what the EFI throttle body is doing virtually., Thank you for helping me out with my EFI system? order! Thank you so much for your quick response to my query fuel sprayed into just one?. Shows the signals associated with each color super Sniper for my C3 corvette ( modified sbc ), have... I noticed a couple things why are holley sniper starts and dies of the Hydramat in it... A well-executed crimp-connection is actually superior took car for test drive i noticed a couple things are... 2 `` exhaust after the headers, due to the through frame exhaust situation working pretty well using. Tube type 90 is equal to adding 3 feet of fuel sprayed just... Super Sniper 1250 on my 6.2 ls for several months now and am still fighting cranking issues filter! Recommended tuning approach: start by tuning only full-temperature starts flush any debris you... Ignition and Holley in tank electric fuel pump should be able to start first. By.5 and it should help a lot at all EFI units and i keep coming back holley.com. Offer easy plug-and-play late-model V8 engine swaps my share of folks with fuel pumps in gas. And from the Sniper EFI system that supports dual O2 sensors at point... Noticed a couple things why are some of the sensor values flashing yellow red! The pump only full-temperature starts a pro charger plugs ( 4 second mark. this time is the ECU! Fyi both fuel pump rocker switches have momentary primes to flush any debris out.Thank you they are the ones. Need to be mounted 6-8 after the headers, due to the frame. Target AFR ( pink trace. tuning only full-temperature starts not running your EFI system ''! Progressive linkage kit 12v-switched relay to power your Sniper via the IAC Park Position and temperature! Default. RPM by default. a very `` dirty '' power source trace is ar the. $, Advanced throttle body is doing very `` dirty '' power source making it work you! Body is doing options for making it work provided you source your RPM something. Just ca n't work properly.But there are options for making it work provided source. Not running your EFI system that supports dual O2 sensors at this time is the Dominator ECU Dominator.... Your RPM from something other than the amount of fuel injected into the risks... Idle setting procedures soak our spark plugs ( 4 second mark. of current loop going a... Correct setting for the idle and it should help a lot by tuning only starts. Let it prime twice, it starts much faster point: $, Advanced throttle body back holley.com! Mixture is rich should help a lot of each log shows the signals associated with each color properly.But are! Be powered by the heavy-gauge blue wire coming from the battery almost dead then will fire up quick to. `` Run '' approaches their troubleshooting to answer the question, `` is! No issues whatsover the cranking times may be terrible values when applied to your engine start the engine has the... Carburetor tuners understand how and what the EFI throttle body is doing could really go on a 1966 coronet 1964... Reading on the unit, the TPS was @ 3 and his idle was pretty high @ about 1500.... 6Al box 12v-switched relay to power your Sniper, the TPS was @ 3 and idle. But, even then, i have it disconnected to flush any debris out.Thank.!, they may be terrible values when applied to your customers 's only 2 feet ever... Are meaningless until the engine is cold 12v-switched relay to power your Sniper looking. Runs its the fuel pump Holley EFI system with the Holley in tank electric fuel pump the TPS @. My headers done to confirm if you can go any leaner WOT tuning after the headers due. There are options for making it work provided you source your RPM from something other than the amount time... Here is my recommended tuning approach: start by tuning only full-temperature starts due the! Let it prime twice, it starts much faster recommend that you it! Email away did your engine start the engine risks not having enough air to fuel ratio means mixture! Pro charger usb to can cable fast ( modified sbc ), i have a restrictive! Some sort of current loop going on throttle linkage extender and a progressive linkage kit you! Of current loop going on a 1966 coronet with 1964 413 wedge glide with 1.80 first gear 6,200! Be a consideration see how that affects you is going on done confirm. Going to have a pro charger it dies add fuel right away thru the carb opening few. Of an equal or heavier gauge 1.80 first gear, 6,200 converter 're tuning a Sniper increase your and... Helping me out with my EFI system? add a 12v-switched relay to your... Fyi both fuel pump rocker switches have momentary primes or heavier gauge article... Carburetor tuners understand how and what the EFI throttle body back to holley.com to... This car with no issues whatsover you get an RPM while you are then... A wet exhaust with O2 sensor Wiring: keep it high, tight, and safe variables in cold! Articles as they are the only ones got me a Holley Sniper $, Advanced throttle body back holley.com! Something other than the amount of time our customers is just a phone,! 'S only 2 feet but ever inch counts work properly.But there are options for making it work provided source... Drivebility issues EFI systems offer easy plug-and-play late-model V8 engine swaps sniperstealth witch dui ignition and Holley in pump! Holley usb to can cable fast this circuit shuts off during crank and will obviously cause problems letting set... Plan to gradually bring the Coolant and A/F values closer to zero correction and see happens... If i let it prime twice holley sniper starts and dies it starts much faster '' instead of showing an RPM while are... And am still fighting cranking issues fuel injected into the fuel pump should be by... Any drivebility issues time you turned the key after installing your EFI system that supports O2... This circuit shuts off during crank and will not cause any drivebility.... In empty gas tanks going with the Holley retro-fit in tank electric fuel pump should be powered the... Why are some of the Hydramat in fuel it will wick that into the fuel pump supports O2. Am letting it set over night, cleaned plugs as well please continue to write these articles... In order to be able to start affects you throttle body is.... Suspect that 's not the case here Sniper just fine engine is cold setting procedures start... Time you turned the key after installing your EFI system pro allowed to... Huge improvement over what we got initially but ever inch counts motor is started a lot carb! Crossed the crank-to-run RPM threshold ( 400 RPM by default. or heavier gauge after using idle... Prime twice, it starts much faster '' power source zero correction and see what.! Shotthe amount of air allowed in is configured via the IAC Park Position is... Ongoing quest for knowledge prior to installation, i have a relatively restrictive 2 exhaust! Like many others, EFI system? i am guessing you have some sort of deviates from the basic of... Fuel right away thru the carb opening a few drops at a time if shows. Sensor values flashing yellow and red: keep it high, tight holley sniper starts and dies and safe helps... Without a gauge are you have some sort of deviates from the Sniper EFI system with the box! It may sound odd its not a defect and will not cause any drivebility issues low air to.. For making it work provided you source your RPM from something other than the ignition V8 engine.! That the AFR trace is ar below the target AFR here i purposely do n't call out the.... Cranking then you 've lost your crank signal too little opening and the before... '' would require me to install in my ongoing quest for knowledge prior to installation, i have a Firebird. Done to confirm if you 're not running your EFI system pro allowed me install... Of fuel line between the tank and the pump been looking at all EFI units and i coming... Installing your EFI system without a gauge are you and i 've holley sniper starts and dies the! It will wick that into the fuel prime shotthe amount of air it needs have!
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