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S60 changed plugs: runs great except with occasional stumbling S60 2004

posted by  thaywood on  Sun Nov 15 04:37 CST 2009
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last visit: Sun Jun 29 08:38 CST 2014
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2004 S60 turbo, 73,000 miles. Changed plugs and the car runs great most of time. Occasionally at idle the RPM's drop, then engine surges a bit. Not a huge surge but seems like the engine realizes it is too slow and compensates.

At least one time at idle, in gear, stopped it did this in a regular pattern: about every 2 seconds the engine would drop about a hundred RPM's, then pull back to normal speed.

I know this doesn't help a lot but after a few days the CEL came on. I don't yet know the code, having misplaced the software key to my OBDII code reader program.

This has been going on for a week, car is driven several times a day. One time the engine stalled. No symptoms other than the engine speed drop/mild surge.

Thanks,






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