Car is garage kept, but seems to be just a bit worse with the cooler weather of the last few days. 2006 E320 CDI with the 722.6 transmission.

The first mile or 2 of my drive every morning the TCC seems like it will engage and then disengage continually, almost like it is slipping, but it keeps grabbing. Once I go about 2 miles it stops and is fine for the rest of the day. It seems to be more prominent at low and mid accelerator positions, and not as bad at higher pedal positions.

What should I start checking?

 

What is engine rpm when this happens?

 

2000-2600 RPM from memory, may do it lower as well.

 

You need to replace the TCC solenoid.

 

I've been paying a bit more attention and this seems worse at 1400-2200 RPM or so. When I give it half throttle or more it mostly stops.

 

Using a proper scanner, set up to monitor Torque converter, Engine rpm, input shaft speed, throttle position, etc. Take a recording of event. Check for any codes first, of course. Also trans fluid level.

 

I hooked up STAR this morning and it shows there is some slippage. No stored codes though. It seems to slip around 40-80rpm once its warm still.

Can STAR do a recording of this so I can have a log? Its hard to review the data afterward without being able to datalog it.

 

I forgot to follow up on this thread with the solution (Well so far it has been working at least!)

I did a TCC Adaption on the car. The CDI has lockup in all gears and this procedure is for the 722.6 with a TCC that locks up in all gears. See the attachment for the procedure.

 

I was wondering what the problem ended up being? I have a 2004 E320. About 2 months ago, in the morning when I first would start it up and take my granddaughter to school...the first 5 minutes or so the transmissions feels like it is slipping. It does it at low miles per hour like 10 to 15 miles per hour. Once the care warms up it completely stops the slippage. So, I have been warming up the car every morning for about 5 to 10 minutes and it doesn't slip. Of course that does not mean something is not wrong still. I my past experiences, changing out the transmission fluid in cars helps to stop the slippage. My mechanic who is very honest with me, told me that if he changes out the transmission fluid, it could make it worse. So, he referred me over to his brother who owns a performance transmission shop. His brother told me the same thing. He wanted to diagnose the problem, but I am wondering if I am going to pay for a diagnose on my transmission, perhaps I should do it with a Certified Mercedes Benz Mechanic but not a dealership.

I am so tempted to change the transmission fluid and take my chances....

Your thoughts?

 

I have a 2004 E320. I have owned it for almost 8 months. About a month ago, when I take my granddaughter to school in the morning, the transmission would start to slip. It will do this for about 5 minutes or a little bit more. Once the car has been driven for those 5 or 10 minutes, it quits slipping altogether. So, every morning what I do now is let the car warm up for 5 to 10 minutes and I do not have a problem anymore.

I ordered a transmission dipstick from Amazon and should be receiving it in a few days. When I check it, the result will be one of 3 things. First, the transmission is low on fluid. I will just fill it up. Second, the transmission fluid level will be at the right amount, but the fluid will either be dark or brown. If that is the case I will have the fluid changed. Third, The fluid is at the right level and looks clean or almost clean....I think at that point I will have to have it diagnosed and get an estimate on the repair and decide if it is worth fixing or not. I only paid $3200 for the car, I really can't see paying close to that for a transmission repair.

My question is this, my mechanic who I have had for several years is reliable, affordable and honest. He said that if I have the transmission fluid changed in my car, that it may not run right. He referred me over to his brother who owns a performance transmission shop. His brother told me the same thing. I have never heard of this happening to a transmission just by changing the fluid. Does anyone have any feedback on this?

Either way, if I do find out the transmission fluid is dark or black, I will more than likely have a Certified MB repair shop do the fluid change or maybe even take it to the dealer for that....

I had submitted a reply on this thread several days ago and it does not show on here....not sure what happened. I did not want to start a new thread seeing that the symptoms of the car in this thread are identical to mine....

 

I have a 2007 E350 Wagon. Transmission always routinely serviced. Recently, I was getting a misfire code and replaced right bank coils, (and plugs) but did not change coil packs on the left bank (did change plugs).

The same “slippy” “hiccupy” shift from 1 - 2, and 2 - 3 at low revs. Always goes away within 1/2 mile. When engine and transmission are warm, no problem. Because it is always a matter of temperature, I suspect minor misfire and electric conduction in coils that are 15 years old and have 245,500

ill keep you posted here.

 

I had the same issue with my 05 e320 CDI at 220K. Occasional harsh shifts and torque converter slip at low speeds when cold. I replaced the TCC solenoid as well as installing the Sonnax and TransGo shift kits. Because I was there, I also replaced the conductor plate. The repair fixed the torque converter slip and significantly improved shifting.