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Thread: Please Help! Out of Ideas!

  1. #1
    Fuel Injected!
    Join Date
    Jan 2015
    Posts
    111

    Please Help! Out of Ideas!

    ‘95 lt1 m6 formula longtubes and ram-air intake setup.

    ive been trying to nail down an issue for the past week. When the cars cold it runs great but when it gets up to normal temps when you put the pedal to the floor it’ll bog down like it’s cutting out, it’s just falls ok it’s face at. Only at higher rpms like 3000 and up. Seems to be very rpm and throttle percentage dependent.

    so far I’ve tried:

    installed another used Opti
    Swapped used coil and icm (re-thermal pasted everything)
    swapped PCM
    swapped TPS
    did a speed density flash to rule out faulty maf.
    Swapped to a new set of injectors

    All this resulted in no change.
    planning to check :

    wires
    plugs
    Fuel pump & fuel filter (both were replaced within the last year).

    It’s driving me crazy. Any input is appreciated, thanks.

    -Johnny B
    Last edited by johnny_b; 05-09-2020 at 12:19 AM.

  2. #2
    Fuel Injected!
    Join Date
    Mar 2013
    Posts
    1,470
    It does sound like all cylinders failure, rather than a single one.

    It could be fueling issue. Fuel pump or pressure regulator loosing it at higher temperatures.
    It could be bad coil, acting strange when heats build up.

    Mechanical failure is also possible, but that will be the last option you should look at.

    I just saw you changed coil, so that leads to fueling issue.

  3. #3

  4. #4
    Carb and Points! LS1thunder's Avatar
    Join Date
    Mar 2018
    Location
    DFW
    Age
    62
    Posts
    2
    Coolant Temp sensor might be acting up. Scan it to see what it shows for both conditions.

  5. #5
    Fuel Injected!
    Join Date
    Jan 2015
    Posts
    111
    Fuel pump was the culprit. I realized the issue would only occur during PE mode.

    Tank was nasty mix of dirt and rust and pump was missing the sock.

    New pump and filter, all is back to normal.

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