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Old 05-12-2012, 05:18 AM   #15
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Originally Posted by Stump Jumper View Post
Hi everyone, definitely not a boost leak or fuel pump. I am losing air pressure when this is happening.
I suspect you may have an air cylinder on or near the turbo which regulates manifold pressure via the engine demand (boost). It may be an apparatus mounted in the exhaust pipe at or near the turbo.

Anyway, possibly the air cylinder has went bad or the line is broken. The actuator for this would be mounted into the intake manifold and air line connections on it should be inspected as well.

This apparatus is commonly called the "wastegate".
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Old 05-13-2012, 09:47 PM   #16
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The "wastegate" operates off the manifold pressure and has nothing to do with the air pressure system he is talking about.
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Old 05-14-2012, 05:22 AM   #17
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The "wastegate" operates off the manifold pressure and has nothing to do with the air pressure system he is talking about.
There are systems on some engines that have an air cylinder to actuate baffles on the turbo and/or in the exhaust system. They are triggered by manifold pressure but an air cylinder does the work.
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