Minh

I encountered with accelerator issue on my S500 W221: sometimes car slow response even i full press gas pedal to floor, engine rev doesn't change for few seconds, I have changed throttle body and engine control unit but problems still persist. Check a live data of accelerator pedal when I press then seem it working fine. Sometimes I have error code P0741 (torque converter clutch solenoid performance or stuck off) on transmission. Since gear box mechatronic, hydraulic valve body are rebuilt recently then I believed that the DTC dủe to Torque Converter Clutch slipping.
Do you think that issue on torque converter can cause acceleration issues of the car

BOTUS

clear the fault if it comes back - then u have an issue

the TC on Mercs is made of chocolate - and of course the TC can impact how it drives - its the connection between the petrol you burn and the back wheels going round, its quite likely to save damage/for safety it could tell the ecu to go in limp

Minh

Torque converter seem a culprit for accelerator issue on my car:

https://mbworld.org/forums/mercedes-...tch-issue.html

xabo

Had a similar issue on my '08 CL65. I would press accelerator to the floor and sometimes would get no response, not even a rev in the engine. Replaced pedal and problem solved.

JohnLane

Gas pedal uses a pair of variable rheostats that operate opposite each other.... at idle one is high resistance the other low resistance. In theory one can monitor them and verify they are sending appropriate signals. In practice you throw the thing away when it is suspect.

Something I do with that ‘gas pedal’ is take it apart and remove one of the (over the top strong) return springs. Presto! You no longer get a calf workout every time you drive the car.

Minh

I read the data stream of Accelerator Pedal and I see that there are two voltage provided on gas pedal and they are changing when I press accelerator pedal but I don't know what the value it should be if the gas pedal working properly.

JohnLane

Voltage of one circuit starts low and goes to high end of range. Other circuit does exactly the opposite. At 50% throttle expect them to match each other. Watch each circuit as it swings from low-high... high-low. If there is a spot that doesn’t move or drops out the potentiometer is dead.