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Thread: Chasing vacuum leak, carb cleaner kills engine?

  1. #101
    Senior Member The Cub's Avatar
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    Enjoy, thanks for posting your success

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  3. #102
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    Quote Originally Posted by Manta Rallier View Post
    Awesome! If you get a chance, let us know what it vacuum level is at idle. Always good to have more data....
    Vacuum at idle measured at a port on the tree is zero. I also checked it with the DIY smoke machine and no leaks.

    I,ll drive it around more this weekend. Fingers crossed it is finally licked.

    Matt


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  4. #103
    Just Some Dude in Jersey The Scifi Guy's Avatar
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    Whaaaaaa...?

    Shouldn't vacuum be at it's highest at idle when measured at the manifold?

    I have an analog vacuum gauge in my dash and when I'm idling it's somewhere around 15Hg. I've had vacuum gauges in my dash for 30 years and they always read somewhere around 15Hg's at idle.

    It's when you step on the gas and let air in via the throttle that your vacuum drops to zero.

    This is the VDO kind that I always used in place of the clock:

    Vacuum gauge 001.JPG

    And this is the type, on the right, that is in my car now:

    Storage boxes 3.jpg

    The needles always stand straight up at 15Hg on both at idle.


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  6. #104
    Can Opeler Knorm65's Avatar
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    Quote Originally Posted by The Scifi Guy View Post
    Whaaaaaa...?

    Shouldn't vacuum be at it's highest at idle when measured at the manifold?

    I have an analog vacuum gauge in my dash and when I'm idling it's somewhere around 15Hg. I've had vacuum gauges in my dash for 30 years and they always read somewhere around 15Hg's at idle.

    It's when you step on the gas and let air in via the throttle that your vacuum drops to zero.

    This is the VDO kind that I always used in place of the clock:

    Vacuum gauge 001.JPG

    And this is the type, on the right, that is in my car now:

    Storage boxes 3.jpg

    The needles always stand straight up at 15Hg on both at idle.

    Vacuum should be around 17-22inHG at idle (you have a cam so 15 is fine). Vacuum is maximum under deceleration when you close the throttle at high rpm. It is only zero at WOT.

    If this guy is reading 0 at idle on the manifold then the manifold port needs to be cleaned out as it is completely clogged.

    The car would not be running with 0 at idle from the manifold.
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  7. #105
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    Quote Originally Posted by Knorm65 View Post
    Vacuum should be around 17-22inHG at idle (you have a cam so 15 is fine). Vacuum is maximum under deceleration when you close the throttle at high rpm. It is only zero at WOT.

    If this guy is reading 0 at idle on the manifold then the manifold port needs to be cleaned out as it is completely clogged.

    The car would not be running with 0 at idle from the manifold.
    Crud! Or I’ve killed another HFT vacuum gauge. I will check again tomorrow.

    Matt


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  8. #106
    Opel Rallier since 1977
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    Quote Originally Posted by mbasura View Post
    Crud! Or I’ve killed another HFT vacuum gauge. I will check again tomorrow.
    A HFT tool FAILING? Impossible! LOL
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  9. #107
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    Chasing vacuum leak, carb cleaner kills engine?

    Quote Originally Posted by Manta Rallier View Post
    A HFT tool FAILING? Impossible! LOL
    Mea culpa. The HFT vacuum gauge turned out to be fine. I had the hose connected to the vacuum advance port on the carb, which I think explains it (the car had only been running a minute or so when I took the measurement).

    Moved to the tree, the the gauge read about 17. The needle bounced a bit but was pretty steady.

    Matt




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  10. #108
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    Hey, that is a pretty good number! Tnx.

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