2001 E320 Possible Torque Converter Issue After Conductor Plate Service - Mercedes-Benz Forum
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post #1 of 11 (permalink) Old 06-16-2019, 12:15 PM Thread Starter
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2001 E320 Possible Torque Converter Issue After Conductor Plate Service

Hello and I am new to the forum, I recently replaced the conductor plate on my 2001 E320 to correct an issue related to the speed sensor. When filling the car with fresh fluid, it seemed to go in and out of gear perfectly. When the fluid was filled to the correct level, I took it for a test drive and all seemed well until I got to the first stop. The car stalled on me at the intersection.. as if the torque converter would not slip. The car now makes a horrible grinding noise from the area where the torque converter lies (in park and neutral) and when attempting to put the car in gear it now stalls almost instantly. I am unsure if there is anything I may have missed when attempting to do this job. Any input on how to troubleshoot and correct something like this would be appreciated. I do have a scan tool that allows me to read/erase transmission codes but unfortunately the vehicle is not throwing any.

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post #2 of 11 (permalink) Old 06-16-2019, 12:52 PM
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Pan was clean? No metal on magnet? One thing that comes to mind is mechanically stuck open TCC solenoid.

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post #3 of 11 (permalink) Old 06-16-2019, 12:55 PM
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From what I read, the speed sensor error often is trigger by wet pilot bushing and I don't read you reporting the bushing replacement?
When you have shorts in computer wiring, all kind of Hell can happen.


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post #4 of 11 (permalink) Old 06-16-2019, 12:58 PM
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Check the attached link out.

First item

STAR TekInfo
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post #5 of 11 (permalink) Old 06-16-2019, 01:06 PM Thread Starter
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There were a few fine metallic particles present, but for a transmission with 160k it didn’t seem too offensive. I didn’t test the solenoids as there were no issues caused by them before the repair. I’ll most likely take it all apart again today. Is there a test I can run on that TCC solenoid to determine if that’s the culprit?

Thank you
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post #6 of 11 (permalink) Old 06-16-2019, 01:16 PM Thread Starter
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The pilot bushing was replaced. I bought a pretty neglected car unfortunately so the PO tried sealing the old one.. my transmission computer was flooded due to it and that has since been cleaned. None of those fixed the issue of a rough shift from 2nd to 3rd and occasionally a soft limp so I decided to investigate the conductor plate itself. The speed sensor on the conductor plate had a crack
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post #7 of 11 (permalink) Old 06-16-2019, 01:17 PM
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Quote:
Originally Posted by Green210 View Post
There were a few fine metallic particles present, but for a transmission with 160k it didnt seem too offensive. I didnt test the solenoids as there were no issues caused by them before the repair. Ill most likely take it all apart again today. Is there a test I can run on that TCC solenoid to determine if thats the culprit?

Thank you
Speck of dirt may have gotten into solenoid during plate replacement. Since o-rings for solenoids are not available from MB get o-ring kit here.

https://cobratransmission.com/MB-722...noid-ORing-Kit

Here is video for solenoid air check.


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post #8 of 11 (permalink) Old 06-16-2019, 02:51 PM Thread Starter
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That first line on StarTek Info sounds exactly like what’s going on. I picked up a used solenoid today (will test and clean before replacement) and ordered the new o rings and drain plug washer. Once I have everything apart I’ll probably opt to thoroughly clean the valve body as well this time. I appreciate all of y’alls help and will get back to y’all once everything is back together again
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post #9 of 11 (permalink) Old 06-16-2019, 05:07 PM
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You should replace the filter again as well. It has an o ring and it's not meant to be used more than once.

Also it's not a good idea to get a used TCC lock up solenoid. Out of all the solenoids on the valve body the TCC solenoid fails most frequently. Just buy a new one.
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post #10 of 11 (permalink) Old 06-16-2019, 05:57 PM Thread Starter
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I guess I figured those solenoids would be hardy, but a new solenoid and filter have been ordered. I really don’t want to do this job for a third time so I don’t plan on taking chances where I shouldn’t. I appreciate the input
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