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Thread: High Idle, Probably Intake Vacuum Leak?

  1. #11
    Join Date
    Jan 2010
    Location
    Brisbane, Australia
    Posts
    1,094

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    Did you understand what I meant remove all the fittings on the valve covers?
    I should have said seal up the engine, valve covers, etc., sealed including NO PCV, then run the engine.
    If you can't remove the oil cap, there is a large vacuum in the crankcase.
    If the engine idles slow with cap on, then idles fast with cap off, the intake manifold is the cause. Gary
    Regards, Gary

  2. #12

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    Yep, fully understand. Makes good sense. I’m with the family at Disneyland, but I’ll be trying that when I get home.

  3. #13
    Join Date
    Jan 2010
    Location
    Brisbane, Australia
    Posts
    1,094

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    That's good. Hopefully something stands out. Gary
    Regards, Gary

  4. #14
    Join Date
    Oct 2016
    Location
    Buenos Aires, Argentina.
    Posts
    46

    Default

    Check the power brake hose, the boost port in TBS and manifold.
    1970 Dodge GTX - Small Block Mopar 418ci - HP EFI Terminator TBI

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