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Compression test comments 900 1991

posted by  daidnik on  Wed Feb 27 06:02 CST 2008
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last visit: Thu Jan 20 22:02 CST 2011
[RELATED]

The variation in compression that you cite is most certainly NOT the cause of a significantly uneven idle.

The most straightforward way to proceed in diagnosis would be to put the car on an oscilloscope. Then you could see the firing of each plug and see if there is a misfire condition, which it sounds like there is. You would also see whether it is only one cylinder or a random misfiring condition happening on different cylinders.

This would help a lot in locating the problem. If the running is that uneven, there has got to be some some visible misfiring going on.






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