Throttle issue with my 2001 e320
 

Pretty simple issue to explain but what is going on?

If I floor it (WOT) the car will kick down and fly! But when you let off throttle response is severely delayed until you restart the car again. It is not sporadic. It happens every single time you WOT. Then restart the car and all is well again. Good news is I very rarely find a need to floor the pedal due to the fact the car gets up and goes briskly with just moderate throttle .

Any ideas here? Thx

Have you read the fault codes?
Mine did exactly the same and actually had a pedal sensor fault.
I replaced it with OEM at great expense and that solved the problem.

Most OBD readers can tell you the % of throttle applied. Try getting one and reading the % of throttle when it malfunctions.

Crazy thing my reader does not pick up any codes. It does not trigger any warning lights either. A friend on here mentioned po120 code. Going to investigate this. Thanks for advice;)

Joe, the TPS on the W210 is a pretty stable unit (unlike the PPS on the S class...) but they can fail.

The classic code is P0120 (not Po120), though if your code reader isn't finding a code, even a pending one (some won't read pending codes) then you may not have a TPS issue. That said, I can recall reading at least one instance in which the TPS was bad but didn't trigger a code.

Try this first: run the throttle/transmissions adaptations reset. It won't hurt anything (just restores default shift settings against the range of the TPS motion) and if it works for a while and then comes back, that will pretty much confirm that it's the TPS...code or not. ;)

And unlike our friend on the dark continent, they are not very expensive here (Peach Parts sells the MB part for $215 and some unspecified ones for $130 and $150; ********az has the Hella brand for $124, and I would certainly trust Hella). Whatever the cost, however, like him, it's an easy ten-minute job to change. Fiddling with the spring is the hardest part.

So to sum up: run the throttle/transmission adaptation reset and drive normally for a day or two, then try the WOT thing. If it doesn't come back, it was a transient hitch in your giddy-up. If it returns, code or no, I would replace the TPS. Your part number is 012-542-33-17.

Good luck.