Date registered: Dec 2007
Vehicle: 1997 E320
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E320 1997: Transmission up-shifting delay trouble after parking a few hours
I purchased a Mercedes Benz E320 1997 two months ago. There are only 140k kilometres on it, but the transmission has a big up-shifting delay problem when it is cold (after parking for several hours or longer). The phenomenon is:
Everyday when I start to drive in the morning or after work, the car keeps at shift 1 (or shift 2 if with “W”-Winter mode) and low speed (<= 20km/hr) for a few minutes. During this period, if I step on the acceleration pedal hard, the engine would roar to about 2.5K+ RPM with noise, but the speed doesn’t change much; if I release the acceleration pedal, the speed would decrease dramatically to about 10mph. After being driven 400 meters or more, the transmission would suddenly shift to 2nd(or 3rd ), then to … till 5th gear, and everything becomes fine as long as I continue drive it.
The manual says up-shift delay happens when the engine is cold (<= 35 C degrees). However, for my car, it seems the transmission temperature is more critical. Its up-shifting still can not function properly by turning on the engine and letting it warm up for 10+ minutes before driving. The only way I may let it work is to walk the car/transmission (do not press gas pedal) for about 400 meters first, and then accelerate and go.
I sent the car to several transmission specialists for diagnosis. One said the transmission liquid was full but there was some pressure loss, and certain error codes were received even after warmed up; but the others could not find anything wrong.
It’s really annoying and frustrating. Should I abandon this car, or you have any good idea?