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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

 
 
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Old 11-17-2012, 09:54 AM
foaxaca foaxaca is offline
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Location: Rancho Cucamonga, CA
 
Join Date: May 2009
Posts: 21
Mein Auto: 1996 328is
Decided that it wasn't a fair test to try the +4 plugs with the pre-cat O2 sensor leads reversed. Switched the leads and reinstalled the +4's this morning and the car started, reached proper idle and ran fantastic. No misfires, no CEL and great power. Smooth and strong acceleration. I'm going to leave them in. Is it safe to assume that if I am not getting any post-cat O2 sensor codes, I shouldn't worry about changing them out also? Have about 3/4 tank of fuel with SeaFoam in it I have to finish off so I have some time left before retesting.
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