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What Could Cause Rough Idle (Not Too Rough But Noticeable Vibration) 850 1995

posted by  Anatoli on  Mon Mar 15 18:29 CST 2010
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last visit: Mon Nov 4 21:52 CST 2013
[RELATED]

So I have 2 850:

1) 95 855 N/A 5 speed that has somewhat rough idle I was trying to figure out. After the car warms up I could feel the vibration in the body and in the steering wheel. It's not stalling and no hiccups or anything of that sort. It's just that the engine vibrates somewhat more then I expect with an 850. Tuneup is pretty recent, new Champion plugs gapped at .028, URO front engine mount, yellow poly firewall mount, scantech mount that goes into the firewall, cleaned AIC valve, MAF, throttle body. car has 196K miles.
2) 97 854 GLT LPT turbo that i compare car #1 against. It's idle is quiet. No noticeable vibration is felt. car has 194.5K miles.

So what could be the cause of the rough idle on car no 1? I know it's a bit more than normal, because a local volvo indie took a look at hos it started and idled while warming up and said that the engine moves somewhat more than he would expect.






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