4matic problems

Replace the engine's glow plugs so it doesn't misfire and leave the more complicated 4-matic system alone.

thanks for coming back so quickly.Ive just done that with six new MB plugs,I thought if Im taking the inlet manifold off I just as well do the six.Its exactly the same.????

I remember the German w124 buying guide mentioned staying away from the

Ximinez

This is the 'Kaufberatung' I was talking about. In German, alas:

If the motor ALWAYS stumbles after a cold start I'd suggest you check the fuel system's hose connections and fuel filters for tightness. A small air leak into the fuel system could be causing the stumble.

Since you don't mention misfiring upon starting, the existing glow plugs must be working, perhaps not at 100%, but none the less working. So I'd suggest you also consider adding some diesel injector cleaner to the fuel - 1 or 2 cans - to ensure the fuel injectors are clean.

I believe one needs to remove this motor's intake manifold to reach all six glow plugs. If you do this be sure to install either Beru or Bosch glow plugs.

Once the engine's stumble is cured, further problems with the 4-matic, if any, will be only related to that system.

I use the cheap chinee Monarch plugs. They don't last as long, but they burn hotter; I recommend them for older engines. I change them once a year in the fall. It makes a HUGE difference IMO.