W124 1996 E300 engine pull?

[amt29]

I've noticed recently that my 1996 W124 E300 auto diesel (OM606.910 engine) has started to do a very faint 'pulling', not steering but engine.
Not easy to describe - it's an engine problem in that when moving along between 45 and 60 mph you can feel the car pull slightly, like its pulling forward and then back (perhaps rocking forward and back (not side to side) is a better description). Fine at slower and faster speeds. It may be it only really happens when the car is hot but not 100% on that as I really notice it when on dual carriage ways and the car is often hot by then.
I suspect the fuel economy has worsened too.
Anyone have any ideas?

Alex

 

[Smiley]

It sounds like a fuel problem - maybe sucking air in? Check all the fuel delivery pipes - are they old and yellow? If so may be worth replacing them all. Check the fuel filters - two up front and the tank strainer at the base of the fuel tank. make sure that the air filter is clean too.

 

[amt29]

Will try that, thanks