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Lt1/t56 stumbling under load

This is a discussion on Lt1/t56 stumbling under load within the LT1 forums, part of the Vehicle Specific category; Hey guys and gals, I have a 94 camaro I recently swapped engine, pcm, harness and trans in. It was ...

  1. #1
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    94 Camaro

    Lt1/t56 stumbling under load

    Hey guys and gals, I have a 94 camaro I recently swapped engine, pcm, harness and trans in. It was an lt1/auto car and I swapped in a freshly built cammed lt1/6speed combo out of a wrecked 94 camaro. The parts car also was previously an automatic and was turned into a 6spd car. My Car now has a stumble after it reaches operating temp. I have replaced all of the following:
    Opti
    Plug wires
    Coil
    Icm
    Fuel filter
    Fuel pump

    Car has a ses light on but my scanner wont link up. And the scanner worked before the swap. Is it possible if the pcm wasn't tuned for the cam it would cause this problem? The guy that built the motor said the pcm was tuned but I don't believe everything im told when buying used stuff.

    Any help is greatly appreciated! Thanks!

  2. #2
    Member krese's Avatar
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    silver
    1996 Trans AM WS6

    since you are not stock it could be anything.....

    when you replaced the opti what brand did you use?

  3. #3
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    94 Camaro

    I believe the opti is a cardone new unit. I know it's no msd but its what was in stock in my area and has a lifetime warranty.

    If my pcm was not tuned for the cam could that cause all this? I bought the parts car and it had the cam installed already and it idles at 1000rpms and lopes pretty good.

    Big cam+no tune=car running like crap?

  4. #4
    Senior Member 5.0THIS's Avatar
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    95 Z28

    You need to know what the code is

  5. #5
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    94 Camaro

    Tried 2 more scan tools today with no luck.

    Also just found where my vibration is coming from, the balancer is wobbling all over the place at idle, when revved up a little it seems to straighten out but its bad at idle. Could that be causing any other problems?

  6. #6
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    94 Camaro

    Here are the codes and readings at idle.

    Code 22 tps sensor low voltage

    Code 44 left o2 sensor bank 2 lean condition

    Code 97 ignition system 4x sensor circuit problem.

    Injector pulse left-4
    Right-0

    KS count 1920

    KR was 3-4 at idle 11 at 2700 rpms

    Open loop maf gr/s 8

    Map "hg-17

    O2 left bounced between 20-110
    Right was a steady 480-500

    Spark advance was 17-20 at idle

    Lt fuel trim cl-16
    Lt fuel trim l-160
    Lt fuel trim r-128

  7. #7
    Junior Member smokestack's Avatar
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    2001 silverado

    I would say you need a tune.

  8. #8
    Junior Member ADICECCA21's Avatar
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    2000 Trans Am WS6 M6

    Quote Originally Posted by smokestack View Post
    I would say you need a tune.
    I second that one

  9. #9
    Former Mopar Man 2002ssslp's Avatar
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    02 Camaro SS, 04 GTO

    Send the PCM to Frost. It is the best 150.00 you can spend.

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