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Old 12-05-2008, 08:44 AM
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Join Date: Jan 2006
Location: Herndon, VA
Posts: 27
C230 #4 misfire

Car: 97 C230, 145K miles

Problem: a couple of weeks ago my C230 suddenly experienced a CEL, ran rough.. no power..

I borrowed a OBD-II meter > the CEL code read that #4 was misfireing. I subsequently replaced all spark plugs [they had better than 80K on them] and seemingly all was fine .

A few days later > car experienced another CEL, code read #4 misfire . I replaced the spark plug boot and thought all was fine

Car ran great for a few more days .. then yesterday > same thing.. car > when cold runs great for about 30 min.. then it MIGHT suddenly misfire > #4 misfire and it chugs along on 3 cylinders.

Why does it do that?? I've replaced the spark plug and the spark plug cap..

Is it the coil?

recommendation for fix??

Kim Langley
97 C-230
80 911 SC
73 2002Tii
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Old 12-05-2008, 09:46 AM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Swap that coil with the other and see if the code follows the suspect coil..
A Dalton
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Old 12-05-2008, 01:33 PM
pawoSD's Avatar
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,282
I too would bet on it being the coil.....if you've made sure all other items are good, it'd have to be.

-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 89k - mine - (OC-91,200)
'17 Metris(VITO!) - 17k - wifes (OC-17k)
'01 E320 Wagon - 160k - mine (OC-160,000)
'01 E320 - 180k - dad's (OC-182,500)
'07 E350 Wagon - 133k - dad's (OC-139,500)
'01 SL500 - 54k - dad's (OC-59,000)
'16 E400 4matic Sedan - 78k - Brothers (OC-80,000)
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