Here is some other info I'm sharing with compress ignite, thanks again for helping me out !

I mention the CruiseControl only because it will affect it almost every time, but like this mornings drive in, the system worked almost the entire time getting what I would consider full boost(around 12 psi) 90% of the time. Off a stop light with full throttle it will spike near 15 psi and quickly drop to 12 psi and hold that through all the gears until I lift off the throttle. Most of the time something is limiting boost to 6-7 psi under all the same conditions and I change nothing. Actually the whole time I've owned this car it Never boosted over the 6-7 psi (without hitting the Cruise lever) until I got it back from a MB shop who said it was my timing chain (3 deg. retard.) He had left off a major vacuum hose at the first Y- connector to the transducers which I found and plugged back in. For some reason the car boosted correctly for the first time I've owned it and over most on the next week it ran great! Then over the next few weeks it started to do more and more of the limited boost thing, maybe the EDS is learning something bad.

Why I keep thinking there has to be some CC elec. connection is that I don't see (or understand) how with the pedal to the floor that the CC could add anything to something already maxed out. The linkages Can Not move any farther, can they? Doesn't the throttle cable move the fuel rack and the Fuel Rack Position Sensor? Also other FI Turbo cars I've worked seemed to also have the same or similar 5 sec. over/extra boost when the cruise is activated, like I feel in this car too, most likely controlled by the EDS. Can you tell me why boost would drop off from 12 psi to 7 psi after 5 sec. of full boost after activating the cruise control and I never lift of the gas. It is some switch/solenoid/EDS dropping out or coming in IMO.

What is the ALDA and can the pressure switch affect any of this ?

Thanks for helping this DieselDummy!