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OK, here is the procedure that I got from Walter Wong last spring when I was at his shop; had same symptoms in '93 9000 Aero, replaced similar components and still had symptoms:
Firstly, do all of this where there is not much traffic, and if possible use a passenger to manage the hand brake, so you can concentrate on driving.
Put the car in 3rd, at about 1500rpm, 25mph or so, and floor it. You, or your passenger will then begin to apply pressure on the handbrake as the rev's come up to about 2500rpm, where you should be making full boost under load (the hand brake is only to apply load to spool the turbo fully). Hold the handbrake with enough pressure to keep the car at around 2500rpm's
When you see the boost start to come up, just rest your left foot on the brake pedal, just enough to trigger the brake light switch, which will revert the car to base boost. If it is too high, then you have a base boost problem, set it up correctly (I know you said you did this, but with the actuator torned so far, this is a foolproof way to check, no messing with BPC valves or anything).
Once you have made sure that the base boost is correct, if it still overboosts, what you have to do is to do the same procedure, but do not trip the brake light.
Just floor it in 3rd at 1500rpm, and pull the hand brake up as you get to around 2000rpm or so, and hold the car floored at 2500rpm's so that it makes full boost. It WILL overboost and buck, but since the fuel is cutting off, it won't hurt the engine (scared me for a min, but Walter assures it won't hurt the engine, since this is how the protection system works). Hold it floored and let it buck a few times, you should be able to see the boost gauge fluctuate down after each buck; it should only buck 3 or 4 times, then stabilize. You may have to drive a mile to let the rear brakes cool off, then do it again.
If your base boost is set right, and the BPC is connected correctly, this will let the computer re-learn what the max pressure it can boost to is, and it will remember this amount and adapt off of it.
In our '93 Aero, it would shoot up to full boost by like 1500rpm even in 1st if you put your foot in it, and this test (with resetting the base boost properly) fixed the problem, now holds steady at full boost, it did immediately after running through this procedure with Walter working my parking brake!
Good luck, just be sure base boost is right, or it may not be able to adjust enough.
Let us know what you find out.
Drew
posted by 199.74.94...
, Tue, 24 Jan 2006 19:48:05, Tue, 24 Jan 2006 20:36:23, Wed, 25 Jan 2006 06:25:31, Tue, 24 Jan 2006 19:03:54
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