I dont know whats going on hope you guys can help with the alda removed and you press down on the rod there is now change. Is there something wrong in the pump?

Are you saying you pushed down the plunger and it stayed down? It should resist pressure and spring up when you release pressure.

Sixto
87 300D

When pressing down it has pressure on it and comes right back up but I have no change when I press it down seems like its running rich all the time.

I will guess you only press the plunger with the engine idling. The ALDA has no effect at idle, or more accurately when there is no load on the engine. Press the plunger while going up a hill at 50 mph and you will feel a loss in power.

Sixto
87 300D

There is no change becase with the alda installed on the pump without the boost line hooked up there is no change. With the alda on its pushing the plunger down.

I have to surrender. I don't understand your question and I don't understand how you're testing. The ALDA pushes the plunger to limit fuel. With a sufficient pressure signal from the manifold, the ALDA releases the plunger to allow more fuel. The ALDA responds to the turbo, the turbo responds to engine load. But you obviously to understand this.

You talk about moving the plunger. How are you doing this while driving on the highway? If you press the plunger with the engine idling, nothing will happen.

Sixto
87 300D

Yes I know exactly how it works but what I'm getting at if I put the Alda back on and screw the adjustment screw all the way down bottoming out the plunger and drive the car there is no change in Proformance compared to it being removed.

Oh, I see. I would shift my attention to the turbo and determine if the wastegate mechanism is working. If it's a pressure actuator, maybe it's stuck open, if it's the later vacuum actuator, maybe it's stuck closed. There are two US 602 models - 1987 190D turbo with pressure actuator and 1990-93 300D 2.5 turbo with vacuum actuator. You might have another car. The 300D 2.5 has a vacuum actuator. To test, rig a line directly from the engine vacuum pump to the wastegate actuator. That should keep the wastegate open while the engine is running. Repeat your ALDA test keeping in mind you engine is unprotected from overboost. Drive the car just enough to confirm the difference you expect. Do not hold the pedal to the floor for more than a few seconds. If there is an improvement, you can either determine why there is no vacuum signal to the wastegate actuator (bad transducer, EDS in limp mode, etc.) or just do what MB should have done in the first place as discussed in this thread - http://www.peachparts.com/shopforum/diesel-discussion/212097-wastegate-actuator-swap-om602-962-a.html

If you have a pressure actuator, temporarily disconnect the pressure signal to the actuator and test as above with the same cautions.

Good luck!

Sixto
87 300D

I have replaced the vaccum actuator to a pressure actuator. I have a boost gauge and egt gauge on my pillar. I have the boost set to 15lbs, and all computer controls have been disabled computer is even unpluged.

It sounds like the pump but first do easy things like checking air and fuel filters, IP timing, throttle linkage, etc. I think there's a flap in the 602 mixing pipe. Did you fix it in the open position?

Sixto
87 300D

If im thinking right your talking about the flap right above the turbo outlet. If so yes that is open at all times. Other things I should have mentioned before is that it runs very rich at idle. While driving everything is good no smoke unless you step on it mostly from a stop you'll get a good size puff of black smoke. When you come to a stop it will smoke kind of a white gray smoke which is also the color when its idleing. Injectors have new nozzles installed and balanced. All filters are new along with a cold air intake with the mass or meter what ever you want to call it removed

Forgot to say the timing is set correct and the head gasket was replaced to to the oil passage breaking leaking oil into the #1 cylinder