wastegate flap

[William Magliocco]

The rupture, tearing, or holes in this wastegate flap
cause improper boost regulation.  The device is
controlled by engine vacuum through a solenoid.

When working, vacuum is supplied by the engine, and
regulated through the solenoid.  It is supposed to
provide a smooth boost.

When the flap fails, the engine vacuum can no longer
"pull" the flap up.  No pull, the wastegate valve will
stay in the "off" position longer than it should. 
Boost goes beyond what the computer says it should,
and then the computer momentarily shuts the fuel
supply off.

In the car, the symptom would be that the engine
abruptly but momentarily loses power under hard
acceleration, but regains power when you let up on the
gas (killing your boost).

But, no, the problems you describe do not appear to be
related.  


		
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