4matic problems

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supergun - 04 Mar 2006 19:45 GMT

I have a 300td 4matic 1993 350,000 kilometers.Works fine .Sometimes
when I start the car from cold the engine missfires for a
second,probably because the diesel has dropped back a bit.When this
happens the 4matic warning light comes on and no 4 wheel drive.
If I disconnect the battery and allow the computer to settle back to
factory default settings and then reconnect and then start the car the
fault is gone.
The question is can I put a manual swith in the system so that I can
switch on the four wheel drive when i need it? And where would the
swith go ,has anybody experienced anything like this?This is a
wonderful car and Ive never even seen another 300 Turbo diesel
Estate,plenty of petrol ones so id like to fix it

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T.G. Lambach - 05 Mar 2006 00:53 GMT

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

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supergun - 05 Mar 2006 06:49 GMT

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.????

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T.G. Lambach - 05 Mar 2006 19:57 GMT

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.

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Richard Sexton - 05 Mar 2006 23:03 GMT

>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.

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.

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The Spanish Inquisition - 05 Mar 2006 08:45 GMT

> I have a 300td 4matic 1993 350,000 kilometers.Works fine .Sometimes
> when I start the car from cold the engine missfires for a
[quoted text clipped - 8 lines]
> wonderful car and Ive never even seen another 300 Turbo diesel
> Estate,plenty of petrol ones so id like to fix it

I remember the German w124 buying guide mentioned staying away from the
4matic models, and from the 200 carburettor model as well. I got burned
ignoring that last advice... ;)

Ximinez

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Our three weapons are fear, surprise, and ruthless efficiency...
and an almost fanatical devotion to the Pope....
http://www.ai.mit.edu/people/paulfitz/spanish/t1.html

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The Spanish Inquisition - 05 Mar 2006 13:59 GMT

> I remember the German w124 buying guide mentioned staying away from the
> 4matic models, and from the 200 carburettor model as well. I got burned
> ignoring that last advice... ;)

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

http://w124-club.de/dss/Kaufberatung.pdf

Ximinez

Signature

Our three weapons are fear, surprise, and ruthless efficiency...
and an almost fanatical devotion to the Pope....
http://www.ai.mit.edu/people/paulfitz/spanish/t1.html

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