Mercedes Benz C-Class W202 (1993 - 2000) - 97 C180 Auto, Misfire when cold | Technical matters | Back Room Forum

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Fri 21 Dec 2007 21:48

97 C180 Auto, Misfire when cold - bromine

I just bought a Mercedes C180 automatic, when starting in the morning it is very sluggish. The first 3 times you start it cuts off straightaway, then the tickover is lumpy and the engine misfires. If you put your foot on the gas pedal it sometimes does not rev up. It feels like the engine is not getting the right mixture (air / fuel intake?) Then after 5 minutes it goes fine.

I also noticed when it's warm the kickdown is a bit weird. If you floor it it goes fine but when you are in 3rd/4th gear when you kick down it only changes down one gear but the rev is still under 3000. Is it related to the misfire??

I have plugged it on the diagnostic computer and it came back with a few faults including oxygen and camshaft sensors, but I cleared them all it was still the same.

Any response will be appreciated.

Edited by Pugugly {P} on 21/12/2007 at 22:00

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Fri 21 Dec 2007 21:58

97 C180 Auto, Misfire when cold - Screwloose

This could be a faulty coolant temp sensor; they don't often leave codes.

The only way to be sure, is to measure it's resistance when cold.

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