PeachParts Mercedes-Benz Forum - View Single Post - OM603 W124 300d problem, running out of possibilities

davidlee · #2 05-18-2012, 01:44 PM

Have you cleaned and checked,your ALDA lines? thats a big step in restoring proper boost levels. If not, there are alots of threads in the forum you can access via Google questions. Just type in Mercedes ALDA and you will find a ton of stuff about it. or you can go to (y@utub#) and find stuff along with videos.
:::::how to clean ALDA boost lines.
On your engine, the nipple the feeds boost pressure the to ALDA is on the top drivers side of the intake manifold, its a little brass fitting that has a short rubber hose cominig off of it then a hard plastic line going to the fender to a little switch over protection valve, then out of the valve and onto the alda which is the (what looks like a beefy fuel pressure regulator).
If that valve is not working or if that little nipple on the intake is clogged, you will get hardly any if no boost.
you can also reroute the lines so the (possible bad valve) is taken out of the equation.
just plumb the little intake line directly to the ALDA