Fuel must also be added to start the engine. So here's how I'd do it:Pin 86: To your ignition switch (12 volts) 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. It appears to be in throttle body? I'm glad this approach worked for you. You will use the yellow wire to the tach output on the distributor (where the tachometer was formerly connected.) How efficient is your engine startup? The Ordering process was so easy and non-painful. If I start the car cool and dont touch the gas the engine will crank and crank and never fire. And the smell is just about gone. ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? Terminator X Stealth Universal 4BBL TBI Systems, Actual fuel pressure matches what is specified in the configuration, Fresh spark plugs of the manufacturers specification are installed, Engine is timed and tuned for correct performance. I want to run an under the carb type throttle stop. 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.) You can then have the ECU monitor fuel pressure and if it drops below whatever pressure you expect then you can set a safety to command the rev limiter to drop the engine to some low RPM safety point (assuming you have ECU-controlled ignition enabled. 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. Did you hear the fuel pump run at key-on? 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? I've been running the super sniper 1250 on my 6.2 ls for several months now and am still fighting cranking issues. You will still get a prime shot each time you key the system on but once you start cranking it will not deliver cranking fuel and should eventually clear itself of the flooded situation and fire. 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. Is one barrel not spraying at all? First, it is fake news that EFI doesn't like big cams. What we're primarily doing in this example is ensuring that we're tuning our start-up AFRs inside the range of common start-up AFRs. Let me know what works for you! Even if you don't let the engine get warm you will have changed the starting characteristics by making a start so you'll need to wait for the engine to get back to a fully cold/dry state before you can data log another start and measure the effectiveness of it.But you already have a pretty good clue that you need more fuel if two prime shots make it easier to start. And I've helped my share of folks with fuel pumps in empty gas tanks. Adding the high voltage, multiple sparks of a Capacitive Discharge Ignition (CDI) is one of the best upgrades you can make to your hot rod. I need to get an answer to the question concerning the TPS. Cranking fuel lets us compensate for that drop in pressure. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. Granted, car was not on but still seemed like a lot of fuel to be returning. May God's grace bless you in the Lord Jesus Christ. By going with an aftermarket manifold you avoid that issue entirely.Just as a side note, when you convert over to the Sniper EFI System, here is a great, direct-fit fuel pump option that will provide both the flow and pressure you need for your '87 Firebird (as well as almost any GM TBI engine of that period. You mentioned its use in # 9 of the top 10 Sniper EFI installation tips. But as you go farther back, it only gets better. 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. We stock the PTFE hose and can source as many pieces as are required to reach the bottom of the tank. 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. This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. So you be the judge. Holley Sniper First Start. This is the crank-to-run RPM. All times are GMT-6. 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. EMI is what wipes out all the electronics. The resulting O2 sensor failure is damaged not defective. Don't change the prime shot percentage though. Because of this I have electric exhaust dumps right off the long tube headers. 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). 4-hole spacers seem to work better than open spacers. 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. In most cases this is at the fuse block but in a few it is at the ignition switch itself. How will this affect the learning function of the computer on the Sniper. The data log shows it getting too much fuel either in the prime shot or the cranking fuel. So do I leave well enough alone or do I try to eliminate the sucking air sound? Find a lower price anywhere and we'll beat it by 5%! 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. Cheers Darren. Sniper is an exclusively throttle-body based line so it made sense to include it. Your advice would be appreciated. If not then stop and buy one now. Capability Range: Advanced I suspect that your ignition sense wire from your Holley system is connected to the crank wire that is hot during cranking and shuts off after you let up on the key. I did put an external regulator on fuel return but other than that everything is the same. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. If not, then the orientation of your O2 sensor is not your problem. I plan on converting to efi this coming spring. Capability Range: Moderate That is pretty straight forward. Thanks for the kind words. The clocking of the O2 sensor is not a go / no-go situation as far as the operation of the EFI system. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. To be 100% honest I was having an issue prior and flooded it. and set 3.) Is that an expectable by-product of adding this relay? Am I following this correctly or not? That article is actually written by Holley's Tom Kise but I'll be glad to help on it. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. Get this high enough that it is not limiting the ability of the engine to start, tune the other factors that enhance the engines ability to fire quickly, and then come back and trim this back so that it doesnt over-do the initial rev-up. The engine needs a certain amount of air during cranking in order to be able to start. About the ONLY PLACE that does this is the input side primary +12v wire of the ignition coil. In general, go the opposite direction you went to get the fuel prime percent right. Good luck! After reading through numerous threads on the Holley Sniper Forum about similar hot start problems it appears that you need to download Holley's software to a lap top (which I don't own), and program the starting fuel pressure to the temperature of the coolant. Full product line and accessories at excellent pricing. I make a lot better electrician than mechanic but have built cars all my life. Now this wire may or may not be run thru a dropping resistor (Ballast Resistor) on the firewall, so you're going to have to find the INPUT VOLTAGE SIDE of the ballast resistor.Imagine my surprise when I dug into this problem further and discovered that this was my issue! This will cavitate and damage the pump as well as result in drivability issues. Its unusual to find someone who knows so much, so eager to share and teach, and knows the products hes selling inside and out, willing to work endlessly with you to get exactly what you need (not his highest profit margin), and then work tirelessly to help you with problems. Thanks. Can I lower it for this purpose? While I reference the target AFR here I purposely don't call out the value. If I go to ignition switch it is the same wire just 2 away. Nice catch, Ken! The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. Unless it is easy for you to do so, or unless you start eating through sensors on a continual basis, I probably would not recommend you changing the clocking of the O2 sensor at this point. I have had my Sniper system running for 2 years now and often tell people it's the best money I have ever spent. 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. 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. That amount of air is determined by the IAC Park Position. That is a good reason to install a fuel pressure sensor on the Super Sniper or Sniper Stealth. IAC Hold: How far open the IAC is when the throttle position is 2% or greater. I'm trying to get this article done. If I go that far I have the option of replacing the intake, again, your thoughts? I have a 88 f150 302 with factory efi and dual tanks. Not much I can add to that. Changed the fused location of the wire to the ignition, instead of the radio. This page was generated at 05:08 PM. Best Overall. And 10 micron filter between the pump and throttle body. Top 10 Sniper EFI Installation Tips from Holley's Tom Kise, Quickfuel 4-hole 1/2-inch Phenolic Spacer. Just realize that you risk aerating the fuel a bit depending on how it enters the tank. So I can't tell you what TPS to use. Can I run the pink ignition wire to the coil positive? It's almost impossible to hurt an engine with no load on it. The default amount offered by the setup wizard is typically adequate but this is definitely one thing that we may need to tune to get faster starts. So, yea it gonna ALWAYS be hard to start!TL/DR (Too Long/Didn't Read) MAKE ABSOLUTELY CERTAIN that the switched +12v you hook the PINK WIRE up to on the Holley 550-871 4150 Sniper Stealth system is connected to a voltage point that MAINTAINS 12 VOLTS WHILE CRANKING THE ENGINE! Feed pressure should be knocking on 58 PSI and the return should ideally be zero, if the feed pressure is not correct, or if the return line pressure is greater than 4-5 PSI find and correct the restriction before proceeding. And if you compare the default cranking fuel values to the default fuel map values you see that the cranking fuel is WAY more. All it knows is what it sees in the pipe. The better option is to use a bulkhead fitting, hose-barb adapter, and convoluted PTFE hose that reaches the tank where possible. We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. 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. Starts & immediately dies. Full product line and accessories at excellent pricing. If you don't show any fuel pressure then fix that. Confession: My TPS is split and works well. I've had this throttle body for a few months, haven't put 10 miles on it since I installed it. 6-8" would require me to install in my headers. Lets dig down into that a bit and see if we can help. Super helpful. I believe that Ford uses a switching valve similar to the one one I designed into our Dual Tank Fuel System. Copyright 2022 Holley Performance Products, Inc. All right reserved. Sounds like it is "only" burning through the initial priming shot. I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. Getting the engine running was never a problem. 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. That's what the fuel prime is all about. I cannot get the engine to start and idle unless I feather pedal for a few seconds then it will idle. What this tells us: First, we dont have any huge problems. Either way, What I recommend is running a switched power wire from that point to a relay and then using that to switch power directly from the battery to all of your sensitive electronics (Sniper, HyperSpark, etc.). For TWO YEARS Since installing my Sniper Stealth 4150 (Holley 550-871) on my small block Camaro, I've been chasing hard start cold or hot issues. My car idles beautifully @ about 800rpm. Where do I start looking for the solution? It is also coming through the idle air port. I always recommend fixing one thing at a time. 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. 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.
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