99 Si Misfire All Cylinders And Rough Idle When Warm
 

New to the forum but I've had a problem lately with my 99 Si. I'm getting a CEL code of misfire 1, 2, 3, and 4 also multiple misfires. I've replace the distributor with an oem replace, adjusted valves (none were loose), cleaned injectors, replace fuel filter, and sprayed IAC valve (idle was still rough after this). Idle is rough, engine shakes when accelerating but this all only happens when at normal operating temp. When cold idle is fine and not flucuating, but once warm it runs horrible! Please help lost what to do next

Re: 99 Si Misfire All Cylinders And Rough Idle When Warm
 

Have you tried running the car without the primary o2 sensor to see if you still get this problem?

Checking the crankshaft and camshaft sensors wouldn't be a bad idea either.

http://forums.bimmerforums.com/forum....php?t=1690962

Re: 99 Si Misfire All Cylinders And Rough Idle When Warm
 

check timing