W204 C63 722.9 rev match/blimp issue
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W204 C63 722.9 rev match/blimp issue
Hey guys i recently blew up my 722.9 trans. Brought it to a shop and they recommend a used trans. So I agreed and they installed a used trans, after they had installed the trans my mechanic said he will use my old conductor plate. After installing the transmission and conductor plate I took the car on a test drive. The car down shifted perfectly with the rev match/blimp but the trans was slipping when upshifting. Then when I got back from the test drive I told the mechanic what is happening, and we tried to figure out why it was slipping and we couldn’t figure it out. So we both agreed to get another used trans. My mechanic also said he won’t use my original conductor plate and said he’ll use the conductor plate that comes with the new used trans. After installing the second used trans and conductor plate I took the car on a test drive once again and the car at first seemed fine. It upshifted perfectly fine, but the rev match/blimp down shifts were gone. And also when aggressively driving the car the tires would chirp which is not normal for my car. Can anyone please help me out with this.
Out Of Control!!
Joined: Apr 2019
Posts: 11,921
Likes: 6,775
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
poor shifts...
The engine and tranny need to co-operate. After the 3rd tranny perhaps you can concider tranny is not responsible for your poor shifting issues.
Without going any further, tranny should be paired to engine with a single set of adaptations. Tranmy should be able to self-tune beyond that.
Once that is out of the way, you can scan your whole chassis looking for issues bugging your ECU-TCU networking.
Without going any further, tranny should be paired to engine with a single set of adaptations. Tranmy should be able to self-tune beyond that.
Once that is out of the way, you can scan your whole chassis looking for issues bugging your ECU-TCU networking.
Last edited by CaliBenzDriver; Nov 5, 2024 at 01:31 AM.
Thread Starter
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Joined: Sep 2024
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My mechanic said he unplugged the battery for 5 minutes and plugged it back and said that’s how you can also reset the adaptation, do you think this is true? And also if I bring the car to mb and they update my tcm software, reset the adaptation, and fix the shift point for the car, will I get back my rev match/blimp?
Last edited by Dannyyyc63; Nov 5, 2024 at 09:24 AM.
Thread Starter
Newbie
Joined: Sep 2024
Posts: 3
Likes: 0
The engine and tranny need to co-operate. After the 3rd tranny perhaps you can concider tranny is not responsible for your poor shifting issues.
Without going any further, tranny should be paired to engine with a single set of adaptations. Tranmy should be able to self-tune beyond that.
Once that is out of the way, you can scan your whole chassis looking for issues bugging your ECU-TCU networking.
Without going any further, tranny should be paired to engine with a single set of adaptations. Tranmy should be able to self-tune beyond that.
Once that is out of the way, you can scan your whole chassis looking for issues bugging your ECU-TCU networking.
My mechanic said he unplugged the battery for 5 minutes and plugged it back and said that’s how you can also reset the adaptation, do you think this is true? And also if I bring the car to mb and they update my tcm software, reset the adaptation, and fix the shift point for the car, will I get back my rev match/blimp?
Out Of Control!!
Joined: Apr 2019
Posts: 11,921
Likes: 6,775
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
GOING FWD!!
My mechanic said he unplugged the battery for 5 minutes and plugged it back and said that’s how you can also reset the adaptation, do you think this is true?
And also if I bring the car to mb and they update my tcm software, reset the adaptation, and fix the shift point for the car, will I get back my rev match/blimp?
And also if I bring the car to mb and they update my tcm software, reset the adaptation, and fix the shift point for the car, will I get back my rev match/blimp?
Lets get a few things straight:
-- Unplugging power does absolutely NOTHING to tranny ADAPTATIONS or engine FUEL TRIMS. These data are preserved no matter what.
-- What cycling power does is restart computers that are otherwise running 24x7 non-stop transacting network data that lead them to instabilities.
-- Rebooting helps temporarily restore ECU-TCU timings that cause delayed shifts.
-- The sleepless modules are [SAM + CGW]
-- The troublemakers are [ESP, SCM, EIS, ISM,...]
-- Dealer visit would be a very welcomed improvement to train Tranny adaptations.
Understand this...
-- Dealer service will bring your shifts up to a level where TCU will keep improving shifts towards perfection.
-- TCU always keeps learning from previous historical shifts... this is what's called self-adaptations.
-- ECU that act poorly is what screws up the tranny adaptations besides overheated thin ATF disables ability to shift well.
++++ LOL ....
> Don't blame tranny for engine own wrong doing.
This is like dancing with my wife... every wrong shifts are my fault. Never herself!
The goofy engine computer is the bad leader! It leads the whole powertrain. TCU tries to learn to match moody engine...
MBWorld Fanatic!
Joined: Dec 2011
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From: Spain UTC/GMT +2 hours
W213 All-terrain
My mechanic said he unplugged the battery for 5 minutes and plugged it back and said that’s how you can also reset the adaptation, do you think this is true? And also if I bring the car to mb and they update my tcm software, reset the adaptation, and fix the shift point for the car, will I get back my rev match/blimp?
You just need a guy with decent MB experience or we can guide you if you are willing to learn and you can invest 100-200$ for a Xentry system.
Joined: Nov 2016
Posts: 7,847
Likes: 3,496
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
My mechanic said he unplugged the battery for 5 minutes and plugged it back and said that’s how you can also reset the adaptation, do you think this is true? And also if I bring the car to mb and they update my tcm software, reset the adaptation, and fix the shift point for the car, will I get back my rev match/blimp?
2. What do you mean by "rev match/blimp"?
3. Stop throwing parts at the problem until you know what is going on. Again, you need XENTRY for that.
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MBWorld Fanatic!
Joined: Dec 2011
Posts: 1,692
Likes: 488
From: Spain UTC/GMT +2 hours
W213 All-terrain
Hey guys i recently blew up my 722.9 trans. Brought it to a shop and they recommend a used trans. So I agreed and they installed a used trans, after they had installed the trans my mechanic said he will use my old conductor plate. After installing the transmission and conductor plate I took the car on a test drive. The car down shifted perfectly with the rev match/blimp but the trans was slipping when upshifting. Then when I got back from the test drive I told the mechanic what is happening, and we tried to figure out why it was slipping and we couldn’t figure it out. So we both agreed to get another used trans. My mechanic also said he won’t use my original conductor plate and said he’ll use the conductor plate that comes with the new used trans. After installing the second used trans and conductor plate I took the car on a test drive once again and the car at first seemed fine. It upshifted perfectly fine, but the rev match/blimp down shifts were gone. And also when aggressively driving the car the tires would chirp which is not normal for my car. Can anyone please help me out with this.
Are you sure that he was capable to do all that?
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