car surges badly when stopping
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HT4100 4.1, 4.5, 4.9 Discussion, car surges badly when stopping in Cadillac Engine Technical Discussion; after driving on freeway for short period of time and coming to stop car surges and tries to speed up, ...
  1. #1
    85silvereldo is offline Cadillac Owners Member
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    car surges badly when stopping

    after driving on freeway for short period of time and coming to stop car surges and tries to speed up, put in neutral and settles down, idles high at 1000 rpm or so. it is a 85 with the pig motor 4100 v8, anyone got any ideas on this???? thanks a bunch guys/gals.

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  3. #2
    awadecki is offline Cadillac Owners Enthusiast
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    Re: car surges badly when stopping

    If the ISC is OK, it may be a worn distributor gear. This was causing a similar surge in my 85 Deville. The worn teeth cause erratic idle timing, which confuses the computer.

  4. #3
    cbloveday's Avatar
    cbloveday is offline Cadillac Owners Connoisseur
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    Re: car surges badly when stopping

    Make sure your gas is ok, and check to make sure there are no gasket leaks.

  5. #4
    peteski is offline Cadillac Owners Enthusiast
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    Re: car surges badly when stopping

    Could also be stuck TCC solenoid. If you search this forum for TCC you'll find lots of info. I have this problem on my Eldorado. Easiest way to tell if it is TCC is to drive your car on the highway while in 3rd gear (and not in Drive). That won't allow the TCC to engage and the car will idle smooth when you exit the highway and stop. That'll be your clue. BTW, it is ok to have it in 3rd gear on the highway. The engine will just rev a bit higher and your gas milage will be lower. But you're doing this just for this test, so it's ok.

    Peteski

  6. #5
    awadecki is offline Cadillac Owners Enthusiast
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    Re: car surges badly when stopping

    BTW, the TCC does engage in 3rd gear on THM440-T4 transmissions (the ones used in the FWD Cadillacs).

  7. #6
    Chicano-Mexicano's Avatar
    Chicano-Mexicano is offline Cadillac Owners Fanatic
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    Re: car surges badly when stopping

    Sounds like your timing has slightly advanced or is the distributor as mentioned by awadecki.

  8. #7
    awadecki is offline Cadillac Owners Enthusiast
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    Re: car surges badly when stopping

    If you've checked everything, I'd pull the distributor and check the gear. You can just buy a new gear, you don't need a new distributor assembly. You simply punch out the pin on the bottom of the housing to remove it.

  9. #8
    peteski is offline Cadillac Owners Enthusiast
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    Re: car surges badly when stopping

    Quote Originally Posted by awadecki View Post
    BTW, the TCC does engage in 3rd gear on THM440-T4 transmissions (the ones used in the FWD Cadillacs).
    I don't readily recall what type of tranny my 85 FWD Eldo has but on mine the TCC does not engage while in 3rd gear. Only in 4th over 50MPH.

    Peteski

  10. #9
    awadecki is offline Cadillac Owners Enthusiast
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    Re: car surges badly when stopping

    I think yours is a THM325c

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