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Discussion Starter · #1 ·
I've had a drop in performance (and boost pressure) on my 1999 9-3 for about a month - see Boost on 9-3.

Having shortened the actuator (6 turns in all!) performance didn't increase and boost only increased slightly.

Yesterday, (with no adjustment for 1000 miles) boost went right of the scale and (what I suspect is) the fuel cut-off came in.

I've reset the actuator to its original position. Boost is still off the scale (1.5+ bar) and fuel cutting off. I'm completely out of ideas.
 

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Discussion Starter · #3 ·
The car went on a rolling road today; the engineer said the solenoid and actuator were both working properly, he also inspected the internals of the wastegate, etc and said all was ok. He thought there may be a blockage in the cat causing the problem.

After trying to set the base boost, he then labelled the problem as 'suspected electronic problem with the boost control'. Back to the drawing board!
 
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