1996 F350 5.8 EFI Upgrade ECM Problems?
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1996 F350 5.8 EFI Upgrade ECM Problems?
Hello everyone. I have a 96 F350 with a 5.8W. My factory EFI system is hasn't been running right for yrs, I 'm looking into putting a Holley or Edelbrock stand alone EFI system. If I do this, will I have problems with the factory ECM. I dont know if it runs other components such as the AC or dash or anything else on the truck. Can I just get rid of the factory ECM? Tks,,,Sam
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The computer only runs the engine and some automatic transmissions. Which transmission do you have?
How has it not been running right? Have you performed the Key On Engine Off self test to check for fault codes? If so, what did you get and were they active or stored codes? What have you done to correct these faults and did it help or not? Have you ever removed the PCM/ ECM to look at the circuit board for bad capacitors? Have you checked fuel pressure with and without the vacuum hose connected? What pressures do you have? It will be a lot cheaper to fix what you have.
How has it not been running right? Have you performed the Key On Engine Off self test to check for fault codes? If so, what did you get and were they active or stored codes? What have you done to correct these faults and did it help or not? Have you ever removed the PCM/ ECM to look at the circuit board for bad capacitors? Have you checked fuel pressure with and without the vacuum hose connected? What pressures do you have? It will be a lot cheaper to fix what you have.
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Thanks for the info. The tranny is the C6 so its not ran by the ECM. Ive had several mechanics look at it and they have done everything you recommended. Its runs good after a few months after the repairs then always eventually acts up. There are some smog components missing (not taken off by me) so maybe that may be contributing to the issues. Its now its missing and bucking when I accelerate but idles fine. It may be a spark issue but I'll get everything checked out. I'm just over the lack of reliability with it so that's why I was thinking about putting a new system in it and also getting rid of the smog equipment. Vehicle inspections are not required for the truck where i'm at so the smog equipment can go. Thanks again
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How well is your mechanical ability 1-cant mow grass, ---- 10-built remote control grass mower, the mechanics must be parts changers, verses fixing what is wrong, and you spending a lot of money for new EFI, isn't going to help them fix any issue on new system, just start changing parts on it, and your still out the expense of buying new EFI, and they cant keep it running either. There's plenty of our members that can/will help you figure out what is causing your problem, if you give them a chance, and can walk you through how to do it. How long have you had truck?
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My mechanical ability is a 2 or 3..lol. Im going to ask around for a recommendation to take it to. There are several Ford clubs and mustang clubs in the area so I'll hit them up to see who they recommend for me. Thanks
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Ive had it for five yrs. Previous owner put in a crate motor with aluminum heads and converted it to a MAF system.
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Fleet Owner
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There in lies the issue....someone else's project with who knows what pieces parts and inherited issues. You really need to dig into what computer is currently installed and whether or not there is a tuner chip installed or something else attached. Now that we know more of the story the path to resolution changes drastically.
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Fleet Owner
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Without knowing what is currently in the truck from an electronics view point introducing a ton of more variables with an aftermarket EFI system you are on a path to even more wallet thinning. At the very least pull out the computer (PCM) to find the catch code and other numbers on it. The most common factory MAF conversion computer is a Mustang A9* series. If there is no sign of a tuner then you know it has a stock tune and most likely the cause of your issues.
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Ok..tks. I just thought going to an entirely new EFI system with the ECM/PCM that comes with it would solve the issue. I'd pull all the emissions components out also. I'll check into the computer thats in it.