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 .
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.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
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27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

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

Sr1000hp.

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

__________________
Steve Danville
what i did myself.
CPS
rear shocks
MAS x 3.
SparkPlugs (twice)
Fuel pump & Filter
Window switch
replaced both failed horns with Honda horns.
Cleaned ERG Tube
Oil changes
Oil consumption Fix
Brake Pads
A/C Recharge
Anti-Freeze change X 2.
Front Shocks. Monroe. $90
Mercedes Warrenty Work:
Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s
Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles