M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

Auto Transmission Problem

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Old Apr 20, 2006 | 12:55 PM
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rednsx3's Avatar
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Auto Transmission Problem

The auto transmission on my 2002 August ML 270 Cdi "hangs" when I accelerate hard in the 1st or 2nd gear and release the accelerator before the gear can change. Then if I switch off the engine and start again the gear shifting is back to normal.

I got the oil and filter changed but the problem persists.

What could be the cause? How can I trouble shoot the problem?
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Old Apr 20, 2006 | 01:31 PM
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2010 ML550, 2010 E350 4M, 1966 Corvette Convt C2
Originally Posted by rednsx3
The auto transmission on my 2002 August ML 270 Cdi "hangs" when I accelerate hard in the 1st or 2nd gear and release the accelerator before the gear can change. Then if I switch off the engine and start again the gear shifting is back to normal.

I got the oil and filter changed but the problem persists.

What could be the cause? How can I trouble shoot the problem?
Its most likely caused by the non MB chip that you installed. Put it back to standard and it will most likely go away unless you have done some permanent damage.
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Old Apr 20, 2006 | 01:44 PM
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i doubt it, is this right when u first start the car? Usually it will hang if u release the accelerator because the computer keeps it in 1st cuz it thinks u are about to get right back on the gas.
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Old Apr 20, 2006 | 05:01 PM
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This hang up in 1st gear sounds a lot like the cold condition on the gas model. When the engine is cold, it holds 2nd gear for a while. Perhaps the diesel is more sensitive to cold conditions and there is a sensor problem? Esp since you say if you shut down and restart, all works well. Does your temp gauge work right?
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Old Apr 21, 2006 | 12:14 PM
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Auto Transmission Problem

Originally Posted by sosh
Its most likely caused by the non MB chip that you installed. Put it back to standard and it will most likely go away unless you have done some permanent damage.

I think you are right -- I never had this problem with the original chip. Will try it with the older chip.
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Old Apr 21, 2006 | 12:16 PM
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Originally Posted by cyeung65
This hang up in 1st gear sounds a lot like the cold condition on the gas model. When the engine is cold, it holds 2nd gear for a while. Perhaps the diesel is more sensitive to cold conditions and there is a sensor problem? Esp since you say if you shut down and restart, all works well. Does your temp gauge work right?

Im located in New Delhi , India and the temp here is quite warm - 35 degrees - doubt if this is a temp problem.
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Old Apr 21, 2006 | 12:18 PM
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Originally Posted by Kar don
i doubt it, is this right when u first start the car? Usually it will hang if u release the accelerator because the computer keeps it in 1st cuz it thinks u are about to get right back on the gas.

Probably is the chip -- I only had this problem after I changed the it. Will re-install the original and see.
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