Question about 1989 Chevrolet Caprice

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How do I disengage TCC on 1989 Chevy Caprice?

1989 Chevy Caprice 5.0l TBI tries to stall when stopping or decelerating. Actually knocks badly and oil light flickers when exiting highway. Dies when shifting into drive or reverse, but idles fine in neutral or park. Drives fine with cruise control set. Cold start is fine, but once warm it starts acting up. I've replaced TPS, EGR, IAC, Coolant temp sensor, MAP sensor, fuel filter, pcv valve, o2 sensor, cap, rotor, spark plugs and wires, thermostat, radiator hoses, most vacuum hoses, radiator and water pump. Have brand new distributor, but haven't installed. All original with under 26k miles. Sat for years.Performed fresh oil change. Added Marvel Mystery Oil and ran 80 miles to clean out sludge. What's going on? Was told TCC maybe locking up and not disengaging. Would a tranny flush/ filter help?

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  • Contributor
  • 29 Answers

What has happened more than likely, unfortunately, the internal piston seals on the servo controls have gotten hard and not usable after this period of time sitting still. The answer is to remove and replace all the seals inside the transmission. Sorry this is the answer, but that is from my 35+ years experience in trans. overhauls. You should not have to replace clutches and plates, also make sure there is no rust on the internal drums from sitting still.

Posted on Apr 15, 2014

  • 20 more comments 
  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    That would be your transmission problem.

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    I see your main problem is in the engine. Sorry for the mix-up. I was reading your heading.

  • Harold Brooks
    Harold Brooks Apr 15, 2014

    No problem Peter. Thanks for the insight. I was told the engine problems were a result of the TCC locking up and not disengaging, which was the reason for the heading. Sorry for the confusion.

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    Thanks, i'll keep watching this post. FYI: TCC lock-up will not affect the engine as your description, so you can rule that out.

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    How does it react under hard acceleration in drive and then try it in low, also?

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    It almost sounds like the ECM is having issues, which may be in some of the connection contacts. The light just came on....In those years if you removed the battery, you had to go through a "relearn" process for the ECM. Its kind of touchy the way it was to be done. If you want more info on that, let me know.

  • Harold Brooks
    Harold Brooks Apr 15, 2014

    Somewhat of a thud when first starting to accelerate hard, but then normal. Have to drive with both feet when stopping, cause without giving gas, it'll die on me.

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    You had to chalk the wheels to make sure the vehicle doesnt take off on you, we always put it up against a wall, you had to let the vehicle run in drive, foot off brake and let it run for about 20 minutes. The other way was to drive it for about 2 weeks and it would eventually relearn itself, but customers hated that.

  • Harold Brooks
    Harold Brooks Apr 15, 2014

    Certainly! Battery has been replaced so I know that may be the possible culprit.

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    Sorry for the delay back, customers here in our shop. I can look up the OEM procedure for relearn. I remember it was a SOB and sometimes we had to do it more than once, and the vehicle acted exactly as you described.

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    I found it in our Mitchell data, and It will take a few minutes to organize it into a pdf for you.

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    Here You go.....Any questions, ask.............Pete

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    Shoot, too small, I'll do it another way.

  • Harold Brooks
    Harold Brooks Apr 15, 2014

    Thanks Peter, would you email it? Haroldbrooksiv@gmail.com

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    Lets see this one.

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    nope. sorry. let me get it another way.

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    This should work......

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    Hmmm, guess this ste is different. I'll try another way.

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    yes, I will e-mail it...........

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    Its worth a try, since this as required when a battery has been disconnected. Good old GM back then.....

  • Bambenek Auto LLC
    Bambenek Auto LLC Apr 15, 2014

    Its worth a try, since this was required when a battery has been disconnected. Good old GM back then.....

  • Harold Brooks
    Harold Brooks Apr 15, 2014

    Thank you

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