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Old 07-12-2000, 11:03 PM
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Join Date: May 1999
Location: Calgary, Alberta, Canada
Posts: 190
I have a 1994 C220 with a surging problem at idle. It does not seem to be doing anything pecuilar at higher engine speeds. Anyhelp would be appreciated. Also engine light has been coming on. Is there a way to run diagnostics on this model?
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Old 07-13-2000, 07:14 PM
Mike Murrell's Avatar
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Join Date: Feb 2000
Posts: 2,141
Steve - I experienced a VERY similar problem with a '91 300-SEL - M103 6 cyl gas engine about a yr. ago.

I changed my own plugs which I've done dozens of time over the yrs., yet still managed to hose up the installation of the #5 cyl plug. The plug recesses in the head are sorta deep and I apparently "bumped" the side electrode enough to reduce the size of the gap. You'd think I would have felt this, but I didn't. After starting up, the car idled pretty shabby and the engine check light came on. The check light really threw me. I always coat the threads of the plugs with anti-seeze compound to protect the head threads and facilitate removal next time around. I took the car to a pro; he found the #5 plug to have too small a gap. Nothing was mentioned about the anti-seize compound.

It's possible your plugs are improperly gapped. My 2 cents. Regards.

Mike Murrell
'91 300-SEL
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Old 07-13-2000, 09:43 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Two things on this car... The air intake hose will slip off if over or under tighened...Also the throttle cable has to be adjusted properly.

Donnie Drummonds
1991 GMC Syclone
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