Quote:
Originally Posted by gsxr
22psi? I'd question the accuracy of the gauge. Most stock engines can't make more than 15-18psi peak. Spec is 12psi, +/- a couple of pounds. Extra boost doesn't make power, it just overheats the intake air charge and increases EGT's... not good.
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Especially on this engine with its computer controlled wastegate. There's no wastegate hose to break which is the most common failure resulting in high boost on the older diesels. If the computer isn't receiving a good boost signal from the intake manifold at the pressure sensor, it won't just keep the wastegate closed trying to see more boost. It will throw an error code and cut boost. The transducer also does not fail open; when they go they fail closed (again, no boost). Unless somebody has piped direct vacuum into the wastegate actuator, I'd check the gauge.