1999 E430 722.6 rough shifts - Mercedes-Benz Forum
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post #1 of 35 (permalink) Old 05-30-2019, 02:11 PM Thread Starter
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1999 E430 722.6 rough shifts

Hello, benzers, since I got the car there was problem when shifting. About half of the shift are too rough, some of them I feel like a car hit me behind. More significant in downshifts and when the fluid reached its working temperature. I changed the fluid,filter, (no metal particles in the old fluid) reseted the adaptations and drove about 4000km, without result!
Then, I decided to take the valve body out for disassembling and cleaning. This time there were metal particles (I think aluminium) in the fluid. I cleaned the valve body (it was dirty), mounted SONNAX overlap control valve kit, poured in new fluid and went on a test drive. At first everything seemed okay, like I was driving a new car, after 30km the shiftings slowly came to what they used to be. Then I reset the adaptations and then every shift was like hit in the back, after 200km the situation returned to what it was. The local shops want 1500 Euros for repair without telling me where they think the problem is (with only 6 months warranty). I don't know what to do! There aren't any trouble codes from the transmittion! I checked the speed sensors, seem to work fine. I would appreciate every idea, mates! Thank you!
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post #2 of 35 (permalink) Old 05-30-2019, 04:31 PM
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Hello

Where are you located ?

Do you have a scanner that can look at all the codes from all the modules (including the TCU) ?

Bad or sticking shift solenoids (modulating solenoids especially) can cause problems like this. I am not saying this is the problem, but did you remove the solenoids and check them physically ? If you did , did you install them properly (sealing) ?
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post #3 of 35 (permalink) Old 05-30-2019, 07:16 PM
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Originally Posted by whili225 View Post
Hello, benzers, since I got the car there was problem when shifting. About half of the shift are too rough, some of them I feel like a car hit me behind. More significant in downshifts and when the fluid reached its working temperature. I changed the fluid,filter, (no metal particles in the old fluid) reseted the adaptations and drove about 4000km, without result!
Then, I decided to take the valve body out for disassembling and cleaning. This time there were metal particles (I think aluminium) in the fluid. I cleaned the valve body (it was dirty), mounted SONNAX overlap control valve kit, poured in new fluid and went on a test drive. At first everything seemed okay, like I was driving a new car, after 30km the shiftings slowly came to what they used to be. Then I reset the adaptations and then every shift was like hit in the back, after 200km the situation returned to what it was. The local shops want 1500 Euros for repair without telling me where they think the problem is (with only 6 months warranty). I don't know what to do! There aren't any trouble codes from the transmittion! I checked the speed sensors, seem to work fine. I would appreciate every idea, mates! Thank you!
What have you used to reset adaptations?

If have installed any modifications in valve body. Adaptations for fill time and fill pressure will have to be reset using SDS or equivalent. Then adapted using very specific driving pattern.

1972 280SEL 4.5
1999 ML320
2000 E320
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post #4 of 35 (permalink) Old 05-31-2019, 03:59 AM Thread Starter
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No trouble codes neither in the Transmission control module, or in the engine control module, engine and transmission mounts are new, the engine works like a dream. The diagnostic I use is Star diagnosis, the reset procedure was conducted with it also. This sonnax kit is not a modification, just a replacement for the overlap control valves to make sure they keep the pressure as they were new.
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post #5 of 35 (permalink) Old 05-31-2019, 06:55 AM
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Have you removed the solenoids from the conductor plate and checked them? You probably have some foreign matter left over that makes them stuck.
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post #6 of 35 (permalink) Old 05-31-2019, 07:00 AM Thread Starter
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Have you removed the solenoids from the conductor plate and checked them? You probably have some foreign matter left over that makes them stuck.
Yes, checked and cleaned them...
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post #7 of 35 (permalink) Old 05-31-2019, 07:17 AM
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You didn't replace the conductor plate right? If you go through the trouble of taking apart the valve body tenuous should have replaced the conductor plate to rule that out as a problem.

I assume you have double checked your fluid level right? Have you checked the readings from the transmission fluid temperature sensor? When you pulled out your solenoids where the o rings still soft?
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post #8 of 35 (permalink) Old 05-31-2019, 07:22 AM
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It may be ATF delivery issue. ATF filter not properly installed, plugged, ATF pump problems etc.

How about upshifts ? How does the car behave when you accelerate when the ATF is cold and when it it warmed up.

Do you have EGS51 or EGS52 Transmission control Unit ? You can access more information on the EGS52 (at least with my scanner)
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post #9 of 35 (permalink) Old 05-31-2019, 07:37 AM Thread Starter
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Originally Posted by illstplaya View Post
You didn't replace the conductor plate right? If you go through the trouble of taking apart the valve body tenuous should have replaced the conductor plate to rule that out as a problem.

I assume you have double checked your fluid level right? Have you checked the readings from the transmission fluid temperature sensor? When you pulled out your solenoids where the o rings still soft?
That's one of my concerns. Is it possible for the conductor plate to fail without any trouble codes and no signs of failure? Fluid level and temp. okay, checking them regularly. About the o rings they looked okay, I don't know how a new one should feel like. However, could these things explain the metal particles in the fluid?
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post #10 of 35 (permalink) Old 05-31-2019, 07:41 AM Thread Starter
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Originally Posted by mrboca View Post
It may be ATF delivery issue. ATF filter not properly installed, plugged, ATF pump problems etc.

How about upshifts ? How does the car behave when you accelerate when the ATF is cold and when it it warmed up.

Do you have EGS51 or EGS52 Transmission control Unit ? You can access more information on the EGS52 (at least with my scanner)
The car accelerates like a dream, in high rpm's upshifts are smooth, more like the upshifts under light acceleration (normal driving) are rough, expecially in 2-3 and 3-4. Downshifts are the bigger issue, expecially in 3-2 and 2-1. About the TCU, not sure.

I forgot to mention, when selecting D there is also a hit when the car is warm.
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