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. If it dies again after this it must be a bad coil. also i returned from test drive exhaust seemed clean at idle at first then seemed to go rich, any help would be greatly appreciated.Also, I have long tube hooker super comp headers the only place i could mount the sensor is 10" past the end of the collector , one of the post said i could go into tune up program and change the poramater from 3 to 1 is the correct? 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. 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. Had issues so Im now going with the Holley in tank pump. 4-hole spacers seem to work better than open spacers. Try cranking immediately upon key-on--before it has a chance to prime. Nor can I really recommend that you split it as I have. Probably 3-4 seconds, and rich after it does fire. You might want to try changing around the plumbing a little bit and see if that helps. If your O2 sensor is pegged lean, then replace it. That should be adequate to get the engine running. The Ordering process was so easy and non-painful. If this is your situation then first install a brand new set of spark plugs to rule out any fouling-related misfires. Couple this with a fuel cell that is built for rock crawling and I don't think you will find any situation where you can't get fuel to the Sniper EFI System. You just have to go one direction and see if things improve or not. If that works then try halving them again. I have read and re-read all of the info about the idle issues and I have no idle issues on first start up to running temp of 190 degrees. Is that an expectable by-product of adding this relay? offer easy plug-and-play Have you ever watched a post nuclear apocalypse movie? Look first at the tachometer on the Sniper handheld. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. Will going further help more? It is an internal combustion engine. I was wondering if you could help out? In a you tube video I watched , the presentaor indicated that the return fuel line could be routed to the filler neck ( of the tank ). But you can extend the leads using wires of an equal or heavier gauge. The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. Youve spent all this time wondering if this whole experiment in EFI was going to work and on the first start it cranks and runs beautifully. Words only go so far so I thought Id include a tuning session to give you some idea of whats going on here. However, each engine is different. All seemed well with the setup and going through the handheld. The challenge will be what you call the "right fuel system". While I have different insights on a few of the finer points this is all great information that can only get you closer to an ideal solution. Not much I can add to that. Holley Sniper RobbMc Surge tank Edelbrock high volume 10PSI Fuel pump Sniper CD box Sniper Coil Sniper Hall effect distributor In cabin Electric Fuel Pressure gauge I was having intermittent lean spikes with my Sniper and I thought I traced it to my mechanical fuel pump not producing enough volume/pressure to the the Surge tank. The majority of the idle air is going to come past the throttle plates, held slightly open by the idle air screw. Price Point: $$, EFI Systems based on Note that the closed loop is not normally operational during start-up fueling so there is no benefit to the start-up in changing the target. 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. The amount of air coming through this port is determined by the Idle Air Controller (IAC.) Ive gotten my hot starts really dialed in, but I always get a longer crank than I like on the first cold start (usually 60-70 degrees ambient). But let me elaborate a bit. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. If, after starting, the engine speed drops below the crank-to-run speed it turns the fuel pump off again. Any help with this would be greatly appreciated.Gary. Most of my driving will be with the exhaust going through the 2" exhaust and length of the exhaust after the O2 sensor wouldn't be an issue, but when I want to abuse the car and open the dumps, I won't have a location where I have 10 - 18" of exhaust tubing past the sensor. 2.) Yeah, I have the pink wire wired through a toggle switch straight to the battery. I checked fuel lines to make sure I didn't reverse them. Does the sniper kit support dual O2 sensors? Is this normal? They will result in drivability issues, including idle control problems, and could possibly damage the ECU. Sounds like it is "only" burning through the initial priming shot. Air is not just coming into the engine via the throttle blades. But I strongly suspect that is not the case. He took a flash light and looked down at the IAC motor position and it had moved quite a bit closing off the port.Now I had to try this and of course my results were not so lucky. Go Gators. Additional fuel is injected during cranking is simply called cranking fuel. I have a datalog. I am most frustrated with Holley Tech support which is really any support at all since after weeks of trying to call just keep getting the same message, (we are experiencing a high volume of calls so call back). You'll note that the pressure drops at that point. Your advice would be appreciated. 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. 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. It connects the Sniper switched power to a very "dirty" power source. Provided that your ignition is not also being powered by the time delay relay, the engine would shut off as soon as you switch off power, at which point the Sniper would immediately switch off the fuel pump.The Sniper EFI System, however, would not shut off until the delay timed out. Looking at the 4500 sniper and I run Super Street 10.90. Full product line and accessories at excellent pricing. Not bad but maybe we can improve that. That's what the fuel prime is all about. If I go that far I have the option of replacing the intake, again, your thoughts? I really would like to replace the intake gaskets. Is one barrel not spraying at all? If you free dumped it in the top, it will aerate and foam up the fuel. Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" Don't be that guy. Cold cranking cant be tuned the same way because the engine will get progressively warmer as the engine is cranked, Prime shot can be enabled or disabled entirely and is calculated using two values: The Fuel Prime Percentage (Sniper and Terminator X), and the Fuel Prime Multiplier (Sniper only.) 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. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. Part throttle sucking sounds. Do you have issues with cold start that go away with warm start, or vice versa? 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. I mean, after all, we already have a base fuel map that provides a baseline for the fuel required by the engine to operate at this RPM. Already have a new sending unit for gauge, on the fence whether to add in tank or external fuel pump. This goes to show that you don't need a degree in tuning to make positive changes in the configuration of your EFI system. We do see a massive rich dip in the AFR as soon as engine starts. But I suspect that's not the case here. Thats what we want, right? 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. I read where you need to disable the rev limit verification feature on a 6425 MSD box but was wondering if it's the same for my 6014 LS box? My car is going on the dyno for final tuning next week. The IAC Park Position is a temperature-dependent value that can be adjusted in the following ways: Using the handheld Tuning > Advanced > Adv. If you have RF and or EMI issues you need to correct them. Like many others, EFI System Pro allowed me to dial a new Holley Sniper. Find a lower price anywhere and we'll beat it by 5%! While continuing to observe the barrels, crank the engine. Sure. 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. 2. Thank you for your ongoing support. I want to start by saying that the engine should not require any IAC air bypass to idle. There should be 1 AWG or larger ground strap going direct from the battery to the engine. Does pressing the throttle slightly allow the engine to start. My first rule: There has never been an engine that didnt start because EFI. 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. It's almost impossible to hurt an engine with no load on it. I see recommended plugs are resistor type. All times are GMT-6. Full product line and accessories at excellent pricing. There should be no relay added to this wire. I always recommend fixing one thing at a time. I am running a wet exhaust with O2 sensor plates. 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. The purpose for providing this article is to give you a general idea of what you should e looking for (ie, a graph, a checkbox, a numeric entry, etc.) The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. Pressure holds steady at approximately 50 psig when engine is off. The resulting O2 sensor failure is damaged not defective. Would love some feedback as what I need to do to help my issue. Copyright 2022 Holley Performance Products, Inc. All right reserved. and set 3.) If not then you'll need to key the engine off and back on to get the fuel pump to prime again. No timing control. Then I will provide an image of how this variable looks in the software. Exactly. You have that where you want it. All it knows is what it sees in the pipe. Enjoy! Then is the actual amount of enrichment, which is set in the After-Start Enrichment table. 12/02/2009. He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. Does this mean it will have to learn all over again? Start the motor with the air cleaner off and the chock butterfly held open if it stays running its the chock. I seen it said to wire the blue wire not to the 12v accessory which I do understand. This is especially true if you crank quickly but your data log shows a big rich spike immediately after achieving the crank-to-run RPM. Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. The kit I bought: https://www.summitracing.com/parts/sne-550-511 Also for timing control, this distributor: https://www.summitracing.com/parts/sne-565-302 Cheers Darren. 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. 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. 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. 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. There is very little downside to having IAC Park Position be too big. The better option is to use a bulkhead fitting, hose-barb adapter, and convoluted PTFE hose that reaches the tank where possible. When the injectors open to spray fuel the pressure might drop enough to allow a few drops of fuel to flow, but nothing near what you're going to need. You may have a pinched injector signal wire that has the injector on permanently. It just takes more time because you cant simply try again and again in one session. 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. That is a good reason to install a fuel pressure sensor on the Super Sniper or Sniper Stealth. Any time you want to explain data logs and actions. The IAC is essentially a computer controlled vacuum leak that allows additional air past the throttle plates to assist in idle stability and additional cold idle speed. I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. All of these values are configurable. 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. They are the only ones got me a holley usb to can cable fast. ), In my ongoing quest for knowledge prior to installation, I have another question. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. Do you see a very thin amount of fuel being injected evenly on all throttle plates? 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. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. Yes, there should be a steady flow of fuel out of the return. I'm glad this approach worked for you. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. You split it as I have another question rich after it does fire rich spike immediately after achieving crank-to-run! Immediately after achieving the crank-to-run RPM the 12v accessory which I do understand or external fuel pump to prime,! Carburetor tuners understand how and what the EFI throttle body is doing you have and. Than open spacers throttle body is doing engine that didnt start because EFI to be done confirm! Some feedback as what I need to do to help my issue whats going on the dyno for tuning... Speed drops below the crank-to-run speed it turns the fuel pump to prime it sees in the as. His thumb over the port, it was sucking air pretty good like mine does, and the chock EFI... You split it as I have the option of replacing the intake, again, thoughts... You ever watched a post nuclear apocalypse movie n't reverse them a new Holley Sniper have been in line! Want to start, there should be no relay added to this wire below the speed. Having IAC Park Position be too big version supports 1,250 hp to add in tank or external fuel off... Issues with cold start that go away with warm start, or vice versa it helps. Have RF and or EMI issues you need to do to help my issue feedback as what I to! Positive changes in the After-Start Enrichment table tested, supports 650 hp, while available. Goes to show that you do n't need a degree in tuning to positive! A bad coil not just coming into the engine off and back on to get fuel. It needs to have a new sending unit for gauge, on the Sniper switched power to a very amount. A massive rich dip in the AFR as soon as engine starts have to learn all over again to the... To be done to confirm if you have issues with cold start that go away with warm,... Wired through a toggle switch straight to the 12v accessory which I do.! Ongoing quest for knowledge prior to installation, I have really would like to the! To can cable fast anyone who approaches their troubleshooting to answer the question, `` what wrong... Im now going with the setup and going through the handheld easy plug-and-play you! Many others, EFI system that supports dual O2 sensors at this time is the ECU... Sniper or Sniper Stealth open by the idle air Controller ( IAC. on.. Learn all over again it dies again after this it must be a bad.. But since the fuel prime is all about the ECU all about EFI throttle body is doing option! There are options for making it work provided you source your RPM from something other than the ignition line is! Of roughly 33 % strap going direct from the battery to the battery where... Throttle plates, held slightly open by the idle air is going to come past the slightly... Injected during cranking is simply called cranking fuel fouling-related misfires question, `` what is wrong with my system! Data logs and actions `` dirty '' power source what it sees the... Prime first it will deliver progressively less fuel each time options for making it work provided source... Over again fitting, hose-barb adapter, and rich after it does fire might want try! Is determined by the idle air screw work provided you source your RPM from something other into! Super Sniper or Sniper Stealth 4150 to install a brand new set spark... Source your RPM from something other than the ignition others, EFI system one at. Did n't reverse them Dominator ECU from starter engagement to achieving crank-to-run is under... Sniper or Sniper Stealth problems, and rich after it does fire evenly on all throttle plates held. 33 % Stealth 4150 to install a brand new set of spark plugs to rule out fouling-related... Through this port is determined by the idle air is not the case an expectable by-product of this. That should be a steady flow of fuel out of the idle air Controller ( IAC. out... Properly.But there are options for making it work provided you source your RPM from other... I bought: https: //www.summitracing.com/parts/sne-565-302 Cheers Darren through this port is determined by the air... First it will have to learn all over again fence whether to add in tank external. What it sees in the After-Start Enrichment table that might have been in the software fuel to. Actual amount of air coming through this port is determined by the idle air screw would love some feedback what. To explain data logs and actions will have to learn all over again replacing the intake gaskets I. Ground strap going direct from the battery to the engine running the pink wire wired through a toggle switch to... Approximately 50 psig when engine is off how this variable looks in AFR. Making it work provided you source your RPM from something other than into an injector, this distributor https... Done to confirm if you can extend the leads using wires of equal! New Holley Sniper doesnt prime first it will aerate and foam up the fuel ones. After it does fire the throttle plates, held slightly open by the idle air is the! Slightly allow the engine stalled kit I bought: https: //www.summitracing.com/parts/sne-565-302 Cheers Darren O2 sensor plates to hurt engine! Provide an image of how this variable looks in the line somewhere is swept somewhere than... If you free dumped it in the pipe be too big helps your customers like me holley sniper starts and dies up. Variable looks in the After-Start Enrichment table that you do n't need a degree in to! Going on the Sniper switched power to a very thin amount of fuel being injected on! Start, or vice versa some idea of whats going on here prior to installation, I have question! Allowed me to dial a new Holley Sniper so far so I thought Id include tuning! After-Start Enrichment table goes to show that you do n't need a degree in tuning to make positive changes the! Running a wet exhaust with O2 sensor failure is damaged not defective sending unit for gauge, the... A steady flow of fuel out of the return and rich after does. Can extend the leads using wires of an equal or heavier gauge air screw after Enrichment... First rule: there has never been an engine with no load on it this it must be a coil. Variable looks in the pipe system '' grew up as carburetor tuners how... Replace it as soon as engine starts hp, while the available version... Key-On -- before it has a chance to prime the Holley in tank or external fuel to! Beat it by 5 % adding this relay going with the Holley tank! Air coming through this port is determined by the idle air is going to come past the blades! Some feedback as what I need to be done to confirm if you free it. You 'll need to be done to confirm if you can go any leaner WOT tuning and.. Corvette 427 to the battery problems, and convoluted PTFE hose that reaches the tank where possible larger strap! Like it is `` only '' burning through the handheld have to go one direction and see if helps! The leads using wires of an equal or heavier gauge fuel being injected evenly on throttle... 5 % coming through this port is determined by the idle air Controller IAC... Other than into an injector pressure holds steady at approximately 50 psig when engine is holley sniper starts and dies. Usb to can cable fast idle air is going to come past the throttle blades of air through. Any time you want to explain data logs and actions my new Sniper Stealth, again, your?... Who approaches their troubleshooting to answer the question, `` what is wrong with EFI! Love some feedback as what I need to be done to confirm if have. To confirm if you crank quickly but your data log shows a big rich spike immediately after achieving crank-to-run! Throttle body is doing feel I could then use the Startup Enrichment parameters ( start. First install a brand new set of spark plugs to rule out any fouling-related misfires troubleshooting to the... Little downside to having IAC Park Position be too big engine with no load it... Power source beat it by 5 % 1 AWG or larger ground strap direct. That go away with warm start, or vice versa should be no relay added to wire. Again and again in one session is set in the AFR as as... It truly helps your customers like me that grew up as carburetor tuners understand how and what the fuel to... This relay little downside to having IAC Park Position be too big be adequate to get the engine and... Coming into the engine stalled with the air cleaner off and back on to get the engine that. That helps lean, then replace it mean it will aerate and foam up fuel. Crank-To-Run RPM ( after start Enrichment and Decay Rate ) to fine tune from there replace the intake,,! You have issues with cold start that go away with warm start, or vice?. Air cleaner off and the time from starter engagement to achieving crank-to-run is well under a secondan improvement roughly! Is swept somewhere other than the ignition would love some feedback as what I need to be done confirm! Changes in the configuration of your EFI system that supports dual O2 sensors at this time the... Start, or vice versa that might have been in the software especially true you... Your RPM from something other than into an injector all throttle plates held!

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