contact148

Ok my 2003 c240 4matic wagon 160,000km has for one week when you stop it idles very rough like its missing NO codes and it does not do it every stop but most times


plugs were changed 40,000km ago spark plug wires never changed orig MAF


after 1 week it did light a code cyl 3 misfire I cleared it and it has NOT returned if it does ill swap coils around to see if code moves


any ideas I don't want to throw $$ at it by just randomly replacing parts

Davis_C320

Make sure your air box is seated all the way down! Had same symptoms and that was the kicker for mine.

contact148

you mean the airfilter housing?


its tight and so is everything else intake related....

contact148

going to bump this as I solved the problem I don't use it much so at 165,000km I changed the spark plug wires put a bosch plug kit 09848 on today problem is gone