Originally Posted by witeshark
Misfires would seem more of an ignition or fuel issue I think.
Right. I'm throwing a P0300 code and I found this info on the net...
A code P0300 may mean that one or more of the following has happened:
Faulty spark plugs or coil rubbers
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
I know my timing chain tensioner is bad and was wondering if that could cause the misfires. Plugs are new, OS Sensors are new. How do I check for a blocked EGR Valve? What are the coils on a BMW? Is that the black box the plugs go into?