Question about 1999 Chevrolet Tracker

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My Tracker shakes like a wet dog when idling!!

When I come to a stop while idling the engine vibrates and shakes like it is going to cut off and sometimes does. It is quite violent when it's cold but as it warms up and I drive it for a while it gets "somewhat" better but never really goes away. The rest of the driving experience is good. What can I do to resolve the problem?

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  • Anonymous Oct 05, 2008

    was told it was the egr valve...very expensive to fix

  • yadayada
    yadayada May 11, 2010

    Have you cleaned the throttle valve and the idle speed control valve?

  • Anvilmaxima
    Anvilmaxima Nov 09, 2013

    The Idle Air Control Valve (I.A.C. valve) bypasses the air flow during a closed position of the throttle plate (idle) . I took my I.A.C valve apart and cleaned the deposits off from it. you can also separate the I.A.C valve housing and manually turn the magnet inside of it and visually see the piston moving in and out .also if you were to manually turn the magnet to position the piston all the way out you could test and see the rpm go back to normal after having to press on the gas at first during start up and eventialy the I.A.C will catch up and should bring the rpm back to 750 with out having to hold on the gas.


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My Tracker shakes at idle too. It shakes more when its in gear than when its in park. So i asked a friend who worked for GM about the shaking and he also said the EGR valve could be letting off some vacuum, if it had accumulated debris and or was stuck open. I took the intake off with the EGR still mounted to it and cleaned both. The EGR seamed to be internally intact and moving so i kept the EGR and changed the EGR gasket and intake gasket. The injectors were soaked in marvel mystery oil during the process. everything was blown out thoroughly with compressed air and put back together. The shake was about 70 percent gone which was a big improvement for me. I'm guessing chevrolet never would have attempted stacking champagne glasses on the hood of these models and I live with what little shake it does have.

Posted on Nov 04, 2013

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You could check to make sure the plug wires are all intact. If they are, try replacing the wires and plugs. It could also be that the idling is set too low. It could be the mapping sensor as well. Also try, Maybe the coil pack is going bad. It will cause the engine to misfire. The can be bought at Auto Zone or Advanced Auto. Some place like that...

Posted on Oct 18, 2008

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I know theres a few things I'm missing but,.. I have a major Headache atm so I'll get back to you with some more, when i can think better. :)

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