Mercedes 190e 2.0 auto idling problem | Technical matters | Back Room Forum

Thu 30 Dec 2004 21:09

Mercedes 190e 2.0 auto idling problem - steve

Car is a late 1991 2 litre auto. Starts fine hot or cold. When cold the fast idle starts at 1100 rpm (great) but if you press the accelerator then the revs will rise and not fall below 2000rpm. (tricky with an auto!) When the engine is hot the idle hunts between 500 and 800 rpm and has a tendency to drop too low - it seems like it is going to stall but then the revs rise again. I have checked out the temperature sensor and exchanged the rotary idle valve with another unit - no improvement. Any ideas?

Steve

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