722.6 Transmission Jerks With Gear Shift After Warming Up
01-14-2019, 05:23 PM
#1
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2004 CLK320 Convertible
722.6 Transmission Jerks With Gear Shift After Warming Up
I have replaced the pilot bushing that was leaking at transmission. Cleaned the wiring harness with electrical spray cleaner at the TCU from oil that wicked up. Was not very much oil at all. It did not wick into the TCU -- opened and checked and no oil inside.
I thought by replacing the leaking pilot bushing that it's what was causing the hard shifting, but it did not fix it.
Here's what it is doing. The 722.6 shifts fine on cold start ups if I start driving immediately. BUT that only has lasted for about 2-3 minutes. Then it starts bucking and shifting too early -- even going to 5th gear at 35mph bogging down the engine.
I'm guessing after it has a little warmth in fluid it is causing a problem in the computer system?
Could this be the conductor plate causing the problem?
When it shifts hard it bucks and acts like when someone dumps the clutch on a 5 speed at a very low rpm making the vehicle jerk. Even slowing down coming to a stop it sounds like it is not operating the torque converter correctly and it feels like it's stuck in a higher gear as you can hear the engine grunting at 900rpm nearing the stop. Hope this makes sense to someone who can suggest what it is to fix it?
Any ideas? This car is a 2004 CLK320 Convertible model with only 78,000 miles on it.
Thank you.
I thought by replacing the leaking pilot bushing that it's what was causing the hard shifting, but it did not fix it.
Here's what it is doing. The 722.6 shifts fine on cold start ups if I start driving immediately. BUT that only has lasted for about 2-3 minutes. Then it starts bucking and shifting too early -- even going to 5th gear at 35mph bogging down the engine.
I'm guessing after it has a little warmth in fluid it is causing a problem in the computer system?
Could this be the conductor plate causing the problem?
When it shifts hard it bucks and acts like when someone dumps the clutch on a 5 speed at a very low rpm making the vehicle jerk. Even slowing down coming to a stop it sounds like it is not operating the torque converter correctly and it feels like it's stuck in a higher gear as you can hear the engine grunting at 900rpm nearing the stop. Hope this makes sense to someone who can suggest what it is to fix it?
Any ideas? This car is a 2004 CLK320 Convertible model with only 78,000 miles on it.
Thank you.
01-14-2019, 06:37 PM
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2004 CLK320 Convertible
My 2004 did the same thing. Flush the fluid and fresh filter and cleaned up the TCU and it has been fine every since.
Hope a flush will fix it -- and not end up being the conductor plate. Someone suggested to also look for antifreeze in the transmission fluid (Hope that's not happening either).
01-15-2019, 07:36 AM
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Thanks for the suggestion! I will try this once I get some more free time. Any YouTube tutorials you know of that will show me how to do a good job at this flush?
Hope a flush will fix it -- and not end up being the conductor plate. Someone suggested to also look for antifreeze in the transmission fluid (Hope that's not happening either).
Hope a flush will fix it -- and not end up being the conductor plate. Someone suggested to also look for antifreeze in the transmission fluid (Hope that's not happening either).
5G Transmission
Last edited by C280 Sport; 01-15-2019 at 07:39 AM.
01-15-2019, 10:41 AM
#5
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Before doing anything, I'd pull codes. A generic OBDII scanner won;t do this - you need one that reads MBZ-specific codes form all of the car's systems. SDS is best, but for less money and easier use, the iCarsoft i980 or MBII, or the Autel MD802 Elite will also work.
Below are the WIS docs for the pan-drop filter change and the flush. To do this properly, you'll need to have at least 16 quarts of fresh fluid: 4 to refill after dropping the pan to change the filter, and 12 for the flush procedure. If you;re really OCD, change the filter AGAIN after the flush.
http://benzbits.com/722_6/FluidFilterChange.pdf
http://benzbits.com/722_6/LevelCheck.pdf
http://benzbits.com/722_6/TransmissionFlush.pdf
Below are the WIS docs for the pan-drop filter change and the flush. To do this properly, you'll need to have at least 16 quarts of fresh fluid: 4 to refill after dropping the pan to change the filter, and 12 for the flush procedure. If you;re really OCD, change the filter AGAIN after the flush.
http://benzbits.com/722_6/FluidFilterChange.pdf
http://benzbits.com/722_6/LevelCheck.pdf
http://benzbits.com/722_6/TransmissionFlush.pdf
