(S500) RPM goes high only when steps on gas hard

Question

my mercedes benz S class (year 2000) runs fine except when i press gas hard, sometimes im not even flooring it. the RPM goes up to 4 or 5 and usually gets stuck until i let go of gas. any ideas what can be wrong?

Answer 1

Sounds like you have a problem in the throttle position sensor, either sitcky or internally faulty. It would be best to take it to the dealer and have them do a "short test." That will identify your problem without any guesswork, and may also tell you about other electrical problems you're not aware of now.

Answer 2

hahaha Moron.!!! Wow guess if i stomped on my gas peddle my RPS would go up to till i release the gas . wow !!!

Answer 3

Might be your transmission not shifting.

Answer 4

The gas pedal on the S-Class is electronic ( not cable actuated ).  Although it is rare, you may be having trouble with the signal from the pedal.