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Check for leaks on the turbo and intercooler piping where the boots clamp on. Many times this is the cause of a low boost problem.
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The other guys took care of the clean side of the turbo system.
You should also look at the dirty (exhaust) side. The up-pipes between the exhaust manifolds and turbo inlet wye sometimes leak and cause low boost. If there isn't pressure on the exhaust wheel, the compressor wheel won't develop boost. Crawl underneath and look for black soot around the up-pipe area. You may have to change the donuts.
Check for leaks on the turbo and intercooler piping where the boots clamp on. Many times this is the cause of a low boost problem.
[/ QUOTE ]
The other guys took care of the clean side of the turbo system.
You should also look at the dirty (exhaust) side. The up-pipes between the exhaust manifolds and turbo inlet wye sometimes leak and cause low boost. If there isn't pressure on the exhaust wheel, the compressor wheel won't develop boost. Crawl underneath and look for black soot around the up-pipe area. You may have to change the donuts.
