722.9 7-speed transmission problem. - Page 5 - Mercedes-Benz Forum

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post #41 of 87 (permalink) Old 04-09-2010, 10:02 AM Thread Starter
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Thanks for the advice.

This is also the reason that I still let the dealer to change the valve body this time, even though I have argument with them, and the price is about 1/3 higher if I ask the indp. guy to do the same work for me.
My mistake. I meant that dealer's price is 1/3 higher than the Indp. mechanic's quote.
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post #42 of 87 (permalink) Old 04-12-2010, 05:55 AM
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Cool Classic speed sensor..

in the valvue body.
Most handy people can diy.

Keep the car, replace the shop......

B

The finest example of automobile engineering in the world
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Stings like a BMR
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and.... all Mercedes Benz.
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post #43 of 87 (permalink) Old 04-12-2010, 06:07 AM
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in the valvue body.
Most handy people can diy.

Keep the car, replace the shop......

B
Try to buy a speed sensor for this transmission

ERIC.

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post #44 of 87 (permalink) Old 04-12-2010, 09:27 AM Thread Starter
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The car is still in the shop, and I will let you know what happen.
Two days with the car with a new valve body. The work statment says they perform the adaptation and so far the shifting quality is good.
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post #45 of 87 (permalink) Old 04-15-2010, 12:13 PM Thread Starter
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I notice sometimes with off-and-go traffic, the transmission jerks when downshifting. It usually happen like the following: when I press the gas a bit and the car moves from stop, then I release the gas padel because the trafic in front of me slow down, the tranny upshits and car still moving in low speed. Then I press the gas patel harder for a faster acceleration, I can see the tranny down shift and it is a noticable jerk or clunk from the car. However, when the car is stopping, no problem at all for all the down shifts, always.

Is it usual or problematic? I experienced this before the valve boday change, but not sure when it started to heppen. I did have the 2-1 downshift jerk problem at the beginning of the ownership and it was corrected by a SW update.
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post #46 of 87 (permalink) Old 04-15-2010, 09:58 PM
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Originally Posted by zhuorongdeng View Post
I notice sometimes with off-and-go traffic, the transmission jerks when downshifting. It usually happen like the following: when I press the gas a bit and the car moves from stop, then I release the gas padel because the trafic in front of me slow down, the tranny upshits and car still moving in low speed. Then I press the gas patel harder for a faster acceleration, I can see the tranny down shift and it is a noticable jerk or clunk from the car. However, when the car is stopping, no problem at all for all the down shifts, always.

Is it usual or problematic? I experienced this before the valve boday change, but not sure when it started to heppen. I did have the 2-1 downshift jerk problem at the beginning of the ownership and it was corrected by a SW update.
Ask them to run the adaptations again as it often needs more than one attempt to get it perfect.

ERIC.

___________________________________________
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- George Bernard Shaw to Winston Churchill.

"Cannot possibly attend first night, will attend second ... if there is one."
- Winston Churchill, in response.
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post #47 of 87 (permalink) Old 04-15-2010, 10:59 PM
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transmission fluid change and filter 1998 c230

i have a 1998 c230 with 148,000 miles on it i am original owner i have always been hesitant to do transmission service fluid and filter change on it.never had any problems.my question should i conside doing this at such high mileage on it .i have always heard different opinions on this.i am really hesitant now it has such high miles.

Last edited by almrkool; 04-15-2010 at 11:10 PM.
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post #48 of 87 (permalink) Old 04-16-2010, 04:22 AM
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i have a 1998 c230 with 148,000 miles on it i am original owner i have always been hesitant to do transmission service fluid and filter change on it.never had any problems.my question should i conside doing this at such high mileage on it .i have always heard different opinions on this.i am really hesitant now it has such high miles.
OMG Not many people could post this with honesty You have been one of the lucky few. I would not push my luck any further if I were in your shoes and get the transmission serviced soon.

ERIC.

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- George Bernard Shaw to Winston Churchill.

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- Winston Churchill, in response.
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post #49 of 87 (permalink) Old 04-17-2010, 03:05 PM Thread Starter
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Ask them to run the adaptations again as it often needs more than one attempt to get it perfect.
Eric, what is the adaptation really is?

Is it done by driving the car in certain way with transmission in special mode to let the transmission "learn" the value automatically, or the technician needs to manually input something via computer to set the transmission right?
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post #50 of 87 (permalink) Old 04-17-2010, 11:52 PM
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Eric, what is the adaptation really is?

Is it done by driving the car in certain way with transmission in special mode to let the transmission "learn" the value automatically, or the technician needs to manually input something via computer to set the transmission right?
Well, once the programing has been done, one tech will sit in the passengers seat with a laptop that is connected to the cars diagnostic socket. The test is then performed with another tech driving the car and each step of the test must be run according to certain parameters ie speed gear/upshift/downshift etc.

Once all the tests are complete the sds with give a fact sheet with a lot of numbers and each test has a correct number that it must reach to pass.

The test takes quite a long time to perform and is very tedious for the driver especially if you do not have the correct road conditions for each test. For example try driving the car at exactly 60kmph in a particular gear until the sds says test complete.

On one car I had to run the tests five times to get a pass from the computer and it took up half my day.

ERIC.

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"I am enclosing two tickets to the first night of my new play; bring a friend, if you have one."
- George Bernard Shaw to Winston Churchill.

"Cannot possibly attend first night, will attend second ... if there is one."
- Winston Churchill, in response.
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