2004 c240 misfire 1,2,3 cylinder , I need help - Mercedes-Benz Forum

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Old 01-04-2013, 01:20 PM   #1 (permalink)
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2004 c240 misfire 1,2,3 cylinder , I need help

My c240 4matic has a 1,2,3 cylinder misfire that makes the car run like shit at idle or acceleration. I have checked the fuel system and the pressure at the rail is 40+ psi and the plugs & packs wires are fine. Plz if anyone can help shed some light on my problem I'd be very greatfull for any helpfull advice.
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Old 01-04-2013, 02:02 PM   #2 (permalink)
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see similar recent thread. check cats.
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Old 01-05-2013, 04:21 PM   #3 (permalink)
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Pull the Top of your Engine Cover off, Mine is Read and the Spark Plug Wires run into it.
Remove all your wires, CAREFULLY
Remove your Power Pack, CAREFULLY.
You may notice Water in there. Did you recently wash the engine with water? Or heavy rainful? Or something that introduced water?
Either way, Pull everything and Leave it Open, Overnight with a Fan to dry out the Wires and Electric Power Pack. Then Reinstall, Reset Codes and I bet this makes it all go away.
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Old 01-07-2013, 06:30 PM   #4 (permalink)
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bad cat ????
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Old 03-01-2013, 09:32 PM   #5 (permalink)
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I had this problem on my 2002 c230k, I had to replace all four coil packs, the previous owner had never changed the spark plugs and the coil packs all burned up trying to get the proper spark.
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Old 03-01-2013, 11:30 PM   #6 (permalink)
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Is there any more codes with recent misfires?

When misfires occur? During drive, after engine start, under heavy acceleration, after or during rain or car wash?

When plugs were changed? How did u determine that plugs and wires are OK? Have u been doing any works with air intake?
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Old 03-02-2013, 07:04 AM   #7 (permalink)
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if it is a v6 engine , missing codes on one bank is almost always caused by a bad catalyst converter on that side .[ common ]
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