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Old 09-22-2012, 09:35 PM
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ztom ztom is offline
I gotta have more cowbell
Location: Thousand Oaks CA
 
Join Date: Sep 2007
Posts: 844
Mein Auto: 1997 528i
I also posted here
http://www.bimmerfest.com/forums/sho...ght=under+load

I now cleaned the icv & throttle body. Found the icv bracket was bent so icv not fully seated in the intake, but the misfire continued. I checked the tps & resistance variation when turned was ok, 0.9 to 5 kohms. Watched the stft & o2s in real time & ok, fast switching & no lean condition.

I now think the issue is a cracked head (which I already knew) & oil or radiator fluid leaking into cyl 3, because that plug is wet & showed damaged ceramic from detonation. With new plugs it seems to not misfire, so I think over time the plug gets coated & spark gets poor. Right now the car runs great, idle also very smooth, & good acceleration. I know I need to change the head, done that before.

Last edited by ztom; 09-22-2012 at 09:39 PM.
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