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Old 11-15-2002, 10:27 AM
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Join Date: Oct 2001
Location: Canada
Posts: 298
400E idle oscillates after shift from D to P


I have a new situation now.

My car's idle oscillates between 600 rpm to 1300 rpm in a 1 Second cycle right after I shift from D to P, this always happens after I drive the car for half an hour, it has happened twice since last night. If I turn off the engine and start it once again, the idle returns to normal. Before I shift from D to P, I feel I need more brake pressure to stop the car from moving forward. The car is still smooth as silk when driving.

I had wiring harness replaced 2 months ago, where should I start the trouble shooting? BTW, I am running the last tank of gas before oil change, so as usual I added a bottle of Pennzoil fuel system cleaner to the tank, I hope it didn't kill my O2 sensor this time.

Looks like another busy weekend in the garage
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.
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Old 11-15-2002, 05:50 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Has the throttle "butterfly" been scrubbed?? & the air bleed hole cleaned out??
MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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