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running rough S90-V90

posted by  smecky on  Wed Dec 20 09:56 CST 2006
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last visit: Tue Apr 14 04:55 CST 2009
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Hi Folks, My wife has a 1998 V90 with ~80k on it, and it has been running rough (particularly when cold), getting worse over the last 10k miles. No chk eng light or codes. Oil is 10w30, changed every 5K. It acts almost like a miss, so I finally did a compression test: 190-200PSI all around (higher than I would have guessed). I am thinking of looking at the coils next. Anyone have experiaence with this sort of problem? Would a cracked or carbon tracking coil snout trip a code? 200 PSI seems high, maybe a carbon buildup, or is this about right? Problem is not seasonal/ climate related. I also checked the color codes for the coil pack wires to make sure they were in the right holes (they were). Why didn't Volvo number them? Thanks, Tom






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