Bassam Hammoud

Hello, i have a w211 e350 2007, i had replaced the torque due to malfunction but now i have another problem is when im on the highway i suddenly lose power and if i accelerate the engine starts screaming but no power, then i put my gear on N then on D and everything is back to normal again, if im heading to the mountain and im going hard sometimes suddenly my rpm goes from 4k to 1k in 2 seconds and back to 4k again with power loss also. whats the problem ?

Spinning

Any warning lights?
Also what did u replace in terms of the torque?

Can u get the vehicle scanned via obd and post results

Bassam Hammoud

just check engine nothing more, i replaced the torque itself. will get OBD soon and post the results

Spinning

the torque converter?
​​​​​​​had an auto trans service? the first example you provided sounds like it could be low on trans fluid, but dont take my word until we see those codes

Bassam Hammoud

Yes the torque converter, trans service is done after the torque replacement and fluids are on point. what options are we looking into ?

Spinning

without the codes id be looking into either the shift solenoids, transmission conductor plate or fluid level of trans.

cetialpha5

Don't forget about replacing the transmission connector, it's a cheap part, but once it starts wicking up transmission fluid, strange things start to happen.

Bassam Hammoud

Whats with the transmission connector ? i didnt change it.

cetialpha5

Is the car a 4matic?

https://www.fcpeuro.com/products/mer...tor-2035400053

Spinning

Yes thats another thing worth replacing, it connects the transmission wiring loom to the conductor plate, from memory the bolt is a 6mm?

Bassam Hammoud

No 2 wheel drive. and i will replace the connector this weekend if its cheap its worth trying then

cetialpha5

Well I don't think the 7 speed had it. So either fluid level or conductor plate, as others said, get a scanner and get the codes.

Bassam Hammoud

8 engine faults : thats the engine faults i have detected today.

engine faults also

3 trany faults


What do you think guys ?

Bankroll

That's an easy one. Whoever worked on it last, screwed up. Take it back to the repair shop that did the transmission work.

scotterikson

Clear ALL codes (your trans. codes are stored, but not active), triple check the fluid level (I think it'll be low), test drive, see what codes return. There appears to be maintenance required on a few areas of this car,

cetialpha5

Yeah, it might actually be ok once the codes are cleared. You have other issues with the car. Search for intake manifold, sounds like it's also time for a new intake manifold. Camshaft sensors might also need to be replaced, but those error codes are stored not present so maybe it'll be ok once everything is cleared. Once cleared, scan again after driving for a bit to see if codes come back.

Spinning

did the workshop who replaced the torque converter scan and clear the codes once they were satisfied with the work? if not as suggested above i'd be clearing and test driving than have a re-scan on the codes to see what returns.
may be worth adapting the transmission yourself while your at it
have a look at the tumble flap shafts to see if they've broken away from their linkage's