I'm trying to solve engine codes P0303 and P0300, misfire in cylinder 3 and multiple cylinder misfire.

Replaced all the plugs and the code still comes up. Now I'm trying to pinpoint if the coil pack is bad.

1997 E420 with single spark plugs per cylinder.

What's the cylinder order in this Car ? which ones cylinder 3 ?

If anyone can help me with any advice on what could be causing these codes to come up, i'd greatly appreciate it.

Cylinder 1-4 is the passenger side

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thanks so much,

so is it counted sequentially from the front of the car or rear of the car ?

from the front.

__________________
David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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Thank you guys for all your help.

I'm going to swap the coils out right now to see what happens.

I've searched the code and some people have said that a clogged cat can cause a misfire code. So i guess that will be my next investigation.