high idle - 89 307
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5.0 and 5.7 Discussion, high idle - 89 307 in Cadillac Engine Discussion; i just replaced the intake manifold gasket and put new gaskets on the carb while it was off. i took ...
  1. #1
    gdorell is offline Cadillac Owners Member
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    high idle - 89 307

    i just replaced the intake manifold gasket and put new gaskets on the carb while it was off. i took some pics of the vacuum hoses...so they look like they are ok. but now she has a really fast idle. without a tach its hard to gauge but if before it was idling at 600, now it must be about 900-1000 rpms.

    any ideas on how to narrow down my problems


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  3. #2
    Motorboat is offline Cadillac Owners Member
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    Re: high idle - 89 307

    Sounds like a vacumm leak. Spray some starting fluid around the manifold and carb base while the engine is running, when the idle increases you have found the leak.

  4. #3
    RocketFast321's Avatar
    RocketFast321 is offline Cadillac Owners Fanatic
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    JTraik is offline Cadillac Owners Enthusiast
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    Re: high idle - 89 307

    I second the vacuum leak... You have to follow a specific pattern when installing the intake manifold, if not installed correctly it is likely that is the cuplrit.

    What kind of gaskets were installed?

  7. #5
    gdorell is offline Cadillac Owners Member
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    Thread Starter

    Re: high idle - 89 307

    one of the vacuum lines did have a slight crack in it. hate those pesking little things....

    im seriously considering putting in a tbi engine just to eliminate them

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