View Full Version : M52/M50 engine swap emissions story

07-31-2008, 11:16 PM
Well I just got the touring back from the M52/M50 swap. I had to etest it today and it passed! It was all good except for the HC reading it was 57 and the fail point was 58.

My question is the guy asked if my car was a 2.5L when he was setting up the test. But it is actually a 2.8 would that have made a difference on the test? I did not want to tell them it was a 97 328is engine with M50 intake.

My research says that it points to a rich running engine. Should I upgrade to hotter plugs to get better fuel burn? The CAT and O2 is new.

08-01-2008, 12:16 AM
Question answered Via PM.