Misfire/hesitation
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Northstar Engines and System Technical Discussion Discussion, Misfire/hesitation in Cadillac Engine Technical Discussion; Hi everyone. Rather new to this forum. I have a 96 STS with 94,000 miles. Bought the car in March ...
  1. #1
    1996STS is offline Cadillac Owners Member
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    Question Misfire/hesitation

    Hi everyone. Rather new to this forum.

    I have a 96 STS with 94,000 miles. Bought the car in March 03 with 54,000 miles. The car recently in the Candian Rockies started to misfire, and hesitate while going up a hill. Replaced plugs with factory AC delco plugs and replaced wires. All the ignition coils seem to be alright. Disconnected fuel injectors as well as plug wires one at a time to see if one did not change the way the engine ran, but no change. Did compression tests on all cylinders, came up with about 165. My dad will run a SCOPE test to try figure which cylinder is misfirng and narrow the problem down to one cylinder. Any thoughts?

    Thanks in advance.

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  3. #2
    OlManRivah's Avatar
    OlManRivah is offline Cadillac Owners Fanatic
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    Re: Misfire/hesitation

    Could be an injector. I would get an OEM injector and replace one at a time and see if still misses, If it does go to the next injector. You didn't mention if you're getting any codes that might help.

    Does it start OK cold? Does it start OK after warming up and setting for awhile?

  4. #3
    1996STS is offline Cadillac Owners Member
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    Re: Misfire/hesitation

    turned out to be a leaking intake manifold gasket. Nutin' else.

  5. #4
    Twilightcall's Avatar
    Twilightcall is offline Cadillac Owners Fanatic
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    Re: Misfire/hesitation

    How did you find the leak? Thanks for the info.

  6. #5
    1996STS is offline Cadillac Owners Member
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    Re: Misfire/hesitation

    Took it to a shop called Tune Tech. They had it for two weeks and charged about $300 to diagnose and fix the problem.

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