Misfire P0303 ,P0302,P0301 Please Help
 

problems with my 98 ML320
Code shows P0303, misfire in cylinder 3 also # 2 ,#1 .
Got all new spark plug and fuel pump but still run poorly and (check engine light) Code shows up all 3 misfire .:confused:
Swap # 3 coil and # 6 coil today but still doing the same.

Do i need a new MAF (Air flow meter) ????
fuel filter ???




Please Help....

Thanks

since all of the problem is on the right side of the engine either have the fuel checked or the exhaust back-pressure checked on that side....poss bad catalyst.

Hi
M.B.DOC (thanks for the help)
My exhaust make a funny sound (something in side) but not a leak sound.
I will check on it today.
Do u think a MAF air flow problems and fuel filter too ????

Thanks

Well, what happened. ?
 

Sr1000hp.

Did you ever fix it ? ?
I have mis fires replaced fuel filter fuel pump, plugs, MAS. still misses.