Question about 1992 Audi 80

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I have an audi 80 misfiring on idle but ok when revs high. i already replace leaking exhaust manifold gasket.

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  • Marvin
    Marvin May 11, 2010

    vacuum leak, and a miss is covered up by raising the engine speed, have u done a cylinder balace test?



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Check the rubber intake boot and all vacuum hoses.

Posted on Sep 19, 2009


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The tok tok sound is probably a blown exhaust gasket. Replace the exhaust manifold gasket. As for the rough idle , replace the distributor cap, cap rotor, spark plugs and wires. With any luck this will take care of the misfire at idle and improve your gas mileage for a minimal cost for the repair.

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Spray around the intake manifold with carb cleaner. If the engine smooths out or revs up, fix the leak. It sounds like a leaking intake manifold gasket.

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My audi 80 1989 model revs at 2000 when not moving, it will do this every so oftern but the revs go down if i restart the engine. It also makes a high piched sound thast seems to be coming from under the...

hi is your car a fuel injection or carburettor model ?
it sounds like you may have an air leak somewhere around the inlet manifold
check all vacuum pipes and hoses for leaks when the engine is running your looking for any hissing noises ,use a length of rubber or plastic hose to your ear and probe around the engine bay with the other end like a stethascope it sounds silly but this is a very affective way of finding vacuum leaks

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i would bring it down to the shop and have the timing checked and the timing belt or chain replaced....also check for vacuum leaks as this could be a problem..however you can usually check for bad vacuum leaks yourself by once you start teh vehicle pop the hood and listen for any loud hissing sounds.....also teh car wont start anymore? did you see that the fuel pump was operational? also id have the shop put it on the computer odbc and check if its throwing out any codes to tell you whats wrong with it.

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