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Old 07-17-2008, 08:40 PM   #1 (permalink)
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Date registered: Sep 2007
Vehicle: 1997 E420, 117,000 mls
Location: Victoria, BC, Canada
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PO301 code, Diagnostic Help Needed

Hello All:

I've replaced the plug, connector, coil and injector on cylinder #1 but I'm stilll getting PO301, misfire on # 1 cylinder. The misfire is very slight and only noticeable at idle. I'm wondering what else could be at fault ?

Cheers, Chato
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Old 10-23-2008, 05:59 PM   #2 (permalink)
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Date registered: Oct 2007
Vehicle: 2003 C230 Sport Coupe
Location: Ottawa, Canada
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I have the same problem with my 2003 c230. My car's idling low and it seems to bottom out at times, which leads to roughness and the check engine light comes on. I've changed spark plug seat as per the stealership (fixed for one day) then the plugs. Next is wires and coils I guess!
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Old 10-24-2008, 04:40 AM   #3 (permalink)
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Vehicle: 2006 CLK 350
Location: Fog City California
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Check the appropriate CAT converter and O2 sensor...
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Old 10-24-2008, 04:24 PM   #4 (permalink)
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I had this problem, finally it was the coil that was too tight.Don't overtighten it.
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Old 10-24-2008, 05:38 PM   #5 (permalink)
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Exclamation New Defective Coil !!!

I would return the coil as defective and get another one that works when tighten to the specified torque. If just tightening the bolt causes pressure on the epoxy resulting in a bad internal connection, then it will eventually fail or cause problems down the road.

Are the coils genuine MBZ or 3rd party source?
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