Clean da vacuum switchover/overboost valve
 

After my experience, I say DO NOT mess with the ALDA at all. If one is thinking about doing that, then that probably means they want to squeeze more power out of the engine.

IF they have not THOROUGHLY cleaned the banjos, boost line and the switchover valve yet.... I say thats the place to start.

My 2 cents

Ah. Diesel is inject long after the air is in there. I see said the blind man. I stand corrected.

One thing I did get out of all of this is black smoke == higher soot in your oil.

And that's all you will be doing until you actually try it. :)

I'm extremely happy with the MUCH better performance without it. The more linear throttle response and elimination of the "boost rush" are worth doing it.

I have dyno sheets and video to prove that it does not hurt performance.

reviving an older post
 

Well, I just removed the ALDA on my 87 300SDL and the power difference astounded me.:dizzy2: The "take offs" are so crisp and spirited, it feels like I am driving my wifes Subaru. The power is a smooth pull right up to 80+ mph (WOW) I have diesel perma-grin:D !!!!!

I have one question, should this have affected how the trans shifts? Because I am now using less pedal to obtain speed, it seems that the shifts are occurring too soon. It may have been out of adjustment prior to the "Tune-up" but I cant be sure.

any ideas?

You answered it yourself. Because you are using less accelerator to get the same power, the tranny receives different signals than it did before.

hmmmmm, how DO YOU adjust the ALDA? in my case i want to turn down the fuel a little bit, coz i'm smoking bad when accelerating even just a bit. its embarassing when you're driving a merc and smoking up the headlights in the rearview.

Yep, on a 603 it's downright astounding.........you'll never go back.

You have affected the trans shifting characteristics and you'll need to tighten the Bowden cable slightly to delay the shifts a bit. The adjustment is a white plastic adjustment screw on the cable right below and slightly forward of the oil filter. Turn the screw three turns toward you to tighten the cable.