Mechanics

BMW Z3 COMPRESSION PROBLEM

1998 BMW Z3 • 160,000 miles

My car misfires when hot, losses compression and is almost impossible to drive (after about 15 min of driving.) I did some research and found out that the catalytic converter may be clogged, so I cut it, and remove it from the exhaust. This action fix the problem temporally, but after I was convinced that I found out what was the problem, and that putting a new catalytic would definitely solve my issue, the car started to misfire and lose power again (now it drives for about 30 min). Now I have the car awaiting to be install a new catalytic but still don't know what is causing the misfire. Please help !
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Guest
February 14, 2013.



Why do you say compression is lost? Have you checked it? Have you checked fuel pump pressure when the engine does this? Have you check for trouble codes in the computer?