Quote:
Originally Posted by Noah300D
Hello everyone, I am new to the Mercedes diesel world. I am familiar with mechanical diesel, but this car is making me scratch my head a bit. I've owned my 1984 300D for about 2 months now, and its had an off and on rough idle/reduced power. So far, I've cleaned the fuel tank, replaced the strainer in the fuel tank, new rubber fuel lines, rebuilt lift pump and fuel filters. I have also lashed the valves back to factory specs. The car has had a bit of a fuel cleanliness problem- was very dark in color and murky when I first drained the fuel tank. Knowing this, I've added some biocide to the tank, and have been changing the filters out pretty frequently. Usually, changing the filters out is enough to get it running great again. However, this last time hasn't seemed to make much difference. The engine is shaking like a paint shaker, and is much louder than it was a week or so ago. She has 158,000 miles on her, and doesn't smoke at all- unless its very cold out. Any help or guidance would be great! Thanks in advance.
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Because of the highlighted in read it sounds like it is fuel related.
You need to have 1/2 tank of fuel to do this. Where the Fuel Lines are at on top of the fender well swap the positions of the Fuel Hoses. That bypasses your Fuel Tank Screen. If it improves your Fuel Tank Screen is restricted.
If there is no improvement don't remove the hoses but change the Filters. If that works then it could still be your tank screen is plugged because changing the position of the hoses bypasses the Fuel Tank Screen and draws Fuel from a different position in the Fuel tank.
Note this is for testing only.
The throttle linkage pivot on the Fire Wall often have plastic parts behind the bracket that fall apart or rubber parts the deteriorate.