W140 unresponsive when hot and misses

[lordylawks]

I own a W140 (1993 500SEL V8) and I have noticed that when hot - say after a journey to London from the West Country down the M4 - it is really slow off the mark, and I mean really slow. It's as if fuel is limited to only 25% of normal flow. Also, it occassionally starts to jerk when flooring it at around 4000RPM. Can't make my mind up if it's the engine missing or the auto box hunting for a change.

I am booked in for a main service with MB dealer next week but would like to know where I might be able to save some of the cost especially in the light of the recent threads about plugs and leads making such a difference.

Thanks in advance

 

[black_camel]

Hello,

I have been seeing the same problems in my 1997 w140. Did the mercedes dealership resolve the problem for you?
Thanks,
Neil

 

[angus falconer]

Could be your Mass Air Flow Sensor (usually rferred to as MAF or MAS). A failing MAS produces symptoms like those.