92 eldorado 4.9 touring idle/rpm problem
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 92 eldorado 4.9 touring idle/rpm problem in Past Cadillac Vehicle Discussion; Hello all, recently have done lots of work on the car, replaced the intake manifold and have had issues getting ...
  1. #1
    deaddorado is offline Cadillac Owners Member
    Automobile(s): 1992 eldorado 4.9
    Join Date
    Nov 2013
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    2

    92 eldorado 4.9 touring idle/rpm problem

    Hello all, recently have done lots of work on the car, replaced the intake manifold and have had issues getting it to run right since then. Just replaced the ISC and am wondering if there is something with the onboard computer to adjust that or where the adjustment screw should be set? it has an uneven idle, by which i mean it floats around a 1000, when you get on the gas hard it jumps up very high and flutters, also when you slow down at a stop it will drop very low. Thank you. any ideas would be greatly appreciated.

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    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
    Automobile(s): 89 Coupe DeVille, 95 Sedan DeVille, 03 SLS, two 02 DHS's
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    Re: 92 eldorado 4.9 touring idle/rpm problem

    Quote Originally Posted by deaddorado View Post
    Hello all, recently have done lots of work on the car, replaced the intake manifold and have had issues getting it to run right since then. Just replaced the ISC and am wondering if there is something with the onboard computer to adjust that or where the adjustment screw should be set? it has an uneven idle, by which i mean it floats around a 1000, when you get on the gas hard it jumps up very high and flutters, also when you slow down at a stop it will drop very low. Thank you. any ideas would be greatly appreciated.
    ------------------------
    there is a special procedure for setting up a new ISC motor -

    if you are having idle problems -
    you should also check the TPS - Throttle Position Sensor setting -

    you should find information for both in the TechTips forum -
    http://www.cadillacforums.com/forums...-tips-how-fix/

    or the 4.9 engine forum -
    http://www.cadillacforums.com/forums/ht4100-4-1-4-5-4/

  4. #3
    deaddorado is offline Cadillac Owners Member
    Automobile(s): 1992 eldorado 4.9
    Join Date
    Nov 2013
    Posts
    2

    Re: 92 eldorado 4.9 touring idle/rpm problem

    Thanks for the help, will try this and see if it helps. The water pump also just went out, its an older car so im assuming theres no relation between the two problems. Have looked up how to change it and doesnt seem too bad, any tips or tricks that we should know?

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