Absolutely love my W163 ML320, had her for over 70,000 miles and she really hasn't missed a beat.
However, recently she doesn't want to pull at anything over 5,000 rpm, I'm sure the needle used to just sweep straight round from 5,000 to 6,000 when on full throttle. It feels like it's holding back ?
I have recently changed all the following.... (all parts from MB main $tealer)
Cleaned MAF - not all that thoroughly though
Fuel filter (and updated pipes)
None of these made any difference either way.
I then had the fault codes read, there were some misfire codes, and some oxygen sensor codes. I had the oxygen sensor replaced and all codes cleared and no codes have re-appeared.
But I still have same problem... lack of power/acceleration above 5,000 rpm.
Any ideas anyone,
Many thanks guys