Question about 1992 Mercury Topaz

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Erratic idle and misfiring problem

I have a 92 Topaz with a 4 cylinder engine. I will give a run down of the history of the problem. Upon starting the engine, it would misfire and shake around a bit until I hit the gas pedal and brought the rpm to 2k or more then it would usually be ok. However sometimes it would surge and lose power while driving for the first few minutes. I changed all but one spark plug (I needed a swivel extension to get to it). The spark plugs were oily and corroded. This seemed to fix the problem. The car ran wonderfully. I finally got the tool I needed and changed the other plug a month later. The next day, the old problem returned. When starting, it sputters and misfires until it is reved. Also the idle is half of what it was. It was idling at 1k, now it's at 500 rpm. I've checked for vacuum leaks, but don't know where to look. The valve cover gasket has always been leaky. I've changed it and it still leaks a little. I followed the manuals instructions. How could changing a spark plug make your car run worse?

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  • tommy81 Apr 13, 2009

    No, I didnt bump the distributor. Its in the same position it always was. You would have to loosen the hold down bolt anyway to move it.

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When you changed the valve cover did you bump the distributor a bit? If it has a distributor mounted on the head you can loosen it and turn it to advance the timing. it may solve your problem.

Posted on Apr 12, 2009

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http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

-----------
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http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
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http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

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This will help.

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