It seem I am getting them all this week!!!
This BMW is running rough when drive is engaged runs o.k on road just lumpy idle worst when cold.
Only fault codes multiple misfire cly 1,2 and 3. Replace plugs and swap coils But fault code still on 1,2 & 3 clys. Has what looks to be an aftermarket cat on said bank and was thinking that cat could be blocked.
Would this flag a misfire and how do I check for back pressure from the cat????
This one is doing my head in checked all the obvious like injectors air leaks etc etc..
MARK