how do i know that the cold start is dead on 1997 c280

Asked by Mar 24, 2013 at 09:40 PM about the Mercedes-Benz C-Class

Question type: Maintenance & Repair

1997 c280 started but won't stay running. Fuel  pump new and working, fuel relay checked and works
good, fuel filter replaced.

2 Answers

3,190

Air filter good?

4,975

I don't think these cars have a cold start selonoid. It has a computer controlled throttle body ( drive by wire) that opens slightly to increase idle when it's cold. Your throttle body is probably filthy with dirt build up and not allowing the correct about of air in when the throttle body is in the idle position. If you can remove and clean the throttle body with carb cleaner. I have a V6 so the throttle body was at the back of the engine facing the firewall and it was difficult to get at. You probably have the straight 6, should be easier to get at. You may not even have to remove it. Just removed the intake tube spray the carb cleaner at the throttle body butterfly. Open the butterfly with my finger and just wipe the area clean with a rag. If you are not getting a code for a faulty Throttle body then I'd say it's just dirty.

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