RE: 99 Cavalier Rough Idle issue -Update (Full Version)

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RE: 99 Cavalier Rough Idle issue -Update

99Cavalier -> RE: 99 Cavalier Rough Idle issue -Update (1/2/2007 7:17:37 AM)
The new wires didn't help. My cousin that works at a GM dealership brought over their OBD meter (lots of extra options on that one!). When the car is idling at 830-850 rpm you can watch the mis-fires on cylinder 4 going up. Take it up to 1000 rpm and they stop and the engine smooths out just fine. All the sensors are working correctly. So, I plan to take it up to his house in a week or two and we are going to pull the head. His guess is a burnt exhaust valve. He said he would do that before we put a used engine in it as otherwise mine is in great shape. If we pull it and its worse then we can go the used engine route.

Hawkez -> RE: 99 Cavalier Rough Idle issue -Update (2/16/2007 7:42:41 PM)
Any updates?

99Cavalier -> RE: 99 Cavalier Rough Idle issue -Update (3/14/2007 2:57:57 PM)
Yes, We worked on it a week and a half ago. We couldn't get the compression to come up on cylinder 4 (one with mis-fire). We pulled the head (hoping it was a valve). Valves looked like 128,000 miles but were OK; it wasn't a valve issue. This pointed to possibly compression rings etc; so I opted for a used engine (vs tearing this one down any further). We put an engine from a 2000 Cavalier that had 42,000 miles on it; car runs great now. Cost including labor was $1,500 and since the rest of the car is in great shape it still beats buying a new car.

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