NorCal124

Can anyone tell me which vacuum hose on the intake manifold produces the most vacuum equally to all combustion chambers. I'm not looking for the sensor related ones, just one that creates the most vacuum into the intake manifold. I'm planning to de-carbon my chambers, valves, etc. and I need to locate that hose on the W124. I've done this on my Nissan and it was easy locating it but the MB proves to be a puzzle.

NorCal124

Nevermind, I found it. De-carboning, although somewhat scary, works great.

crr1612

where is it, how is it done, and what does it do?

NorCal124

You're pretty much cleaning out your combustion chambers. Using the vacuum hose you run water through the engine to clean up any soot build up in the chamber and especially around the valve seats. I think its the reason I'm failing smog. I also ran some throttle body cleaner through the same hose before running water just for good measure.

dragonfli_VF

would seafoam do anything beneficial for a 150k mile car?

NorCal124

Nothing any other injector/fuel system cleaner would do. I've had better success with Lucas or Chevron.