Originally Posted by porkface

I was told it could be the inhibitor switch or NSS, is there a way to bypass it or adjust it?------------this is completely wrong. the nss in a benz acts just like any other. allows the starter to engage when the shifter is in p or n---nothing else.

Incorrect.

NSS has a resistor circuit for both gear selection and ASR control.

It is also part of the Rev limit circuit.

PS

An easy test for rev limit circuit is to look for rev limit of 4K in N/P, then drive the car above 18 mph and put the selector in N...rev the rpms and if the circuit is OK, the rev limiter will not be in effect.

That is why a wheel sensor will effect the circuit...the ECU is looking at wheel rpm for rev limit paremeters when in gear.



The main reason for rev limit is to protect the torque converter In N/P, but is also in circuit in lower gear/rpm ranges.