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Old 07-22-2002, 04:26 AM
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c280 rough idle

My 94's C280 mileage 137k km idling rough after engine wash. What could be the problem?
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Old 07-22-2002, 06:56 AM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,878
You got water somewhere that it ain't supposed to be. If you drive it enough it MAY dry out and go back to giving you a smooth idle. You have to be real careful when washing these newer cars.
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Old 07-22-2002, 02:01 PM
I told you so!
Join Date: Jun 2002
Location: Motor City, MI
Posts: 2,804
Check the ignition wires. Late in the evening, when it's dark, fire up the car ad open the hood. Mist some water on the wires while it's idling. If you see ANY sparks or arcing, then it's time to either replace the wires or the end connectors.
95 E320 Cabriolet, 140K
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Old 07-22-2002, 02:10 PM
Registered User
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,784
104 engines have cavities in the head for the plugs and no way for the water to get out..The valve cover must be covered when washing engine.
The best way to dry them out is to remove the plug/wire cover and blow the cavities out with air ..
If it still skips after drying, replace the 3 plug boot/connectors under the 3 coils ... they are infamous failure part and short $$$.
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Old 07-22-2002, 03:39 PM
it leaks, its german
Join Date: Mar 2002
Location: raleigh nc
Posts: 1,111
There also have been coil and injector harness failures with the 104 engines as well, water sems to aggrivate it.

Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
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