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#1
11-25-2007, 01:11 PM
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Misfire Mystery
A shout out for help on a misfire mystery. My 1994 E320 wagon received a major 30,000 mile service recently.....new wires, coils, etc. Within days it started to sporadicly misfire. The engine would start on 4 or 5 cylinders(?), not sure how to tell how many were working, and run quite rough and very rich as I could smell gas quite easily. After taking the engine cover off and manually checking all coils and connections, the misfire went away. I did not find anything loose, but I did shake each coil a little before re-covering. Again, yesterday and today, it started rough with a definite cylinder not firing but after warm-up and a few minutes of driving the misfire disappeared. Throughout this mystery, the check engine light has NOT activated. Any suggestions as to what to look at next to try and solve this bothersome development?
__________________
 1994 E420, 1994 E320CE, 1994 E320TE and 1991 300SE
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#2
11-25-2007, 01:51 PM
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Did you change the plug connectors under the coils????????????????????????
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#3
11-25-2007, 01:55 PM
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A D ....thanks for the quick response, I didn't do the 30k major service so I will ask my MB indy your question. I am hopeful he did as he does nothing but MB/BMW work for the last dozen years or so.
__________________
1994 E420, 1994 E320CE, 1994 E320TE and 1991 300SE
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#4
11-25-2007, 02:18 PM
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Well , if he is hip to 104 HFM/SFI , then he will know about the 3 coil connectors...VERY COMMON fault on that waste spark system..and make sure he has F8DC4 plugs in there and NOT PLATS.
I would also ask him to check the engine wire harness insulation..another thing he should know all about. And lastly, ask if the OVP relay has been upgraded to the newer version..if no, then just do it.
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#6
11-25-2007, 02:31 PM
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