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Old 12-10-2003, 07:04 PM
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blackmercedes blackmercedes is offline
Just a guy
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
There is no CE light? Probably not an O2 sensor, and I think the above statement is true, as the sensor is not in play during a rich cold-start.

I'm not familiar with the fuel delivery systems on the C230 (it's my own car, guess I better bone up) so I'm not sure if the car has a fuel pump relay (I suppose it does) and that would be a suspect.

Things to check:

Ignition: Plugs, plug wires.

Fuel: Pump, pump relay, filter.

There might be some stored codes even without a CE light, you might want to have them read.

The beating noise would have me suspecting the fuel pump.
John Shellenberg
1998 C230 "Black Betty" 240K

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