View Single Post
Old 05-14-2012, 08:04 AM   #15420
PerkM3
Account Under Review
 
Join Date: Mar 2009
Location: Denver, Colorado
Posts: 3,853
My Ride: 2004 SG M3 ESS-550
Quote:
Originally Posted by Andy2108 View Post
Or a bad cat...
Quote:
Originally Posted by Rubenk View Post
I've never had a bad 02 sensor or bad cat make a car run weird, but I suppose the bad 02 could cause the ECU to make things misbehave.
Yeah a bad cat would make you through a code for emissions not cause cylinders to misfire. I'm betting that it's the 02 sensor on the 1-3 header. I've seen this happen on a number of cars. I remember when I did my header install and switched the 02's around and it made the car run like crap.
PerkM3 is offline   Reply With Quote