I test drove a 1995 E420 (W124) today. With the gear shift in Park - I revved the engine. It went smoothly up to 4,000 RPM - the stopped acceleration. And at 4,000 it was "rough", would not go higher.

With car in low gear (first) - I drove the car and quickly revved to 6,000 RPM - no problem.

So is there a governor with revving? Or is the car presented with an "issue"

I will comment that with normal driving - there were some hesitations and "missing" though I couldn't clearly define a miss - just something wrong - it's not smooth.

Point of this question - is there engine controls that limit the RPM when not engaged in gears - it may be part of the ARS

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Thanks for the help
Bill Fisher

'86 560SL (186K) - Now a 'classic' : Registered as an Historic Vehicle
02 E430 in the stable
'14 LS460 (Lexus)
- - - - -
'95 E420 (198K) found a new home
'99 E320 (80K) (gave it's life for me as we hit a bumper)
'95 E420 (231K) Sold to a happy buyer, new to Mercedes
'90 300E (65K) Sold to an Mercedes Lover
'92 190E (215K) - retired to the salvage yard
'93 500SEL (214K) - Moved to another family, still runs like a young pup