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Thread: Vacuum Leak,

  1. #1
    Beginner kablea's Avatar
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    Vacuum Leak,

    Howdy all

    i think my GQ 4.2 carby has developed a Vacuum leak in the manifold area somewhere.
    wondered if there is a common area to look or if i needa rip it all apart and replace all gaskets and seals. (i Surley hope not ) lol...

    thanks
    Aaron.

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    Administrator AB's Avatar
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    Hi Aaron, you can spray around the manifold gasket when your engines running with a can of water dispersant to find out where its leaking.

    If theres a leak then it will suck it in and your engine will rev slightly higher too then you know where the problem is.

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    Ok there is a simple way to find this if you have one......

    Grab yourself a can of CRC or WD40 (with the little tube) & spray around the gaskets, vac hoses & joins (not all over the place just one area, join or vac hose at a time). If you have a rough idle coursed by a vac leak it will smooth out if you hit the leak until it sucks up the spray then it will start to idle rough again & to confirm spay it again & it should do the same & you will have found your leak.

    Good luck

    Cheers
    Paul

    p.s Good onya Andy no posting what Im posting.......lol
    Last edited by patch697; 9th August 2010 at 02:56 PM.

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    Administrator AB's Avatar
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    p.s Good onya Andy no posting what Im posting.......lol
    Beat ya!!!

    Same time though, mustve just snuck in..haha

    But yours is probably better as everyone has wd40 or crc...hahaha

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    Quote Originally Posted by Andy View Post
    Beat ya!!!

    Same time though, mustve just snuck in..haha

    But yours is probably better as everyone has wd40 or crc...hahaha
    It all works the same way in principle so yeah what he said to kablea.....lol

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    Beginner kablea's Avatar
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    lol... Thanks Fellas.

    i'll give it bash when i get home

    Aaron

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    Beginner kablea's Avatar
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    Howdy guys,

    I spent Ages checking every gasket, hose, ect ect ect... stil no luck... But one thing i did notice is if i take one of the vac hoses off the manifold, the idle jumps up and she seam to run good, cept for the 1100 Rpm, on gas,

    But on petrol, she wont idle at all ever... with out a bit of throttle. Vac hose on or off seamed to make no difference.

    So i'm thinking it might not be a vacume leak.

    Any advice would be great. Cant get it to my mechanic for a week... so i hope i can fix it this w/end. or at least figure out what it it doing...

    Thanks In advance
    Aaron.

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    Without see it in person I'd say the carby sounds like it needs a rebuild. What you have described is not an uncommon problem with TB42s running duel fuel & I've come across it quite a few times.

    Cheers
    Paul

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    Patrol God Finly Owner's Avatar
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    Hi and welcome Aaron. Do they have a PCV, it may be blocked? or am I totally ooff track? head tired tonight.

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    Beginner kablea's Avatar
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    Quote Originally Posted by Finly Owner View Post
    Hi and welcome Aaron. Do they have a PCV, it may be blocked? or am I totally ooff track? head tired tonight.
    Just checked the PCV Hoses, They are all ok, (Almost lost my finger down the hose) ROFL!


    Aaron.

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