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Old 11-18-2003, 12:09 PM
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Join Date: Jul 2002
Location: KINGSPORT, TN
Posts: 197
1989 300se rough idle at times

My wife's 89 300se at times begins idling rough and almost to the point of missing. It has 191k miles on it and about 3-4 months ago had a valve job done and the injectors replaced. It does not do it all the time or any certain time. It will be running fine and all of a sudden it will run rough and almost hesitate when pulling out for maybe a minute or two and then it will straighten out and run smooth for a while. I have had a problem with consuming oil(yes, I am the one that has posted about the oil consumption problem) and once in the past I had to replace the plugs due to #2, 3, & 4 plugs getting oil into the hole and fouling it out. #2 was the worst. Could this be a plug problem that maybe fires ok for a while and then misses a few times and then fires ok? Any advise would be greatly appreciated.

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Old 11-19-2003, 04:42 PM
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Join Date: Jul 2002
Location: KINGSPORT, TN
Posts: 197
idle problem

Update: checked the plugs and 4 of 6 were fouled and I wonder how they could even fire with the carbon/oil build up on the plug. I am back to the oil consumption problem again. I changed plugs and voila, idle fixed.

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