Question about 1992 Mitsubishi 3000GT

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I have a boost leak and i can not tell where it is coming from it seems like a waste gate is stuck open. 92 3000gt vr-4

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Build a pressure tester, its about 10 bucks in parts from home depot.... here are the directions.... I made version three, and it is plenty good enough.

http://www.stealth316.com/2-pressuretester.htm

Cheers,
Scott
iceman_ii on 3si.org

Posted on Feb 21, 2009

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Thanks Terry. The car does not have full power.


Are you getting turbo boost pressure, waste gate may be open check waste gate actuator. Check that BOV is not stuck open you could clean with some throttle body cleaner. http://www.youtube.com/watch?v=govRsNtY8DM

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Sounds like the waste gate is having trouble. It could be what's called a "boost leak". the waste gate is most likely internal on a factory system. On the turbo, You'll see a small, vacuum pod looking thing with a linkage connected. Check to make sure the vacuum line/hose is properly connected and run that line to make sure it's not cracked some where.
Otherwise, it could be any coupler, connection on the pipes that carry the air from the turbo to the throttle body. Even a "loose clamp" can cause boost leaks. With over boost, it's most likely the waste gate.
Good luck. Hope ya find it.

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One of your turbo boots or intake boots is off or has a hole in it! Could be either cracked or has come loose of the clamp. This is your hissing noise your hearing. It means the turbo is making the boost but it is not getting to your engine. Its leaking out the boot. No boost no power! Poor performance and bad fuel economy too. You need to check all of your boots and clamps. If you say it is by the firewall then start on the side that the hiss seems to be comming from. DONT unplug your turbo waste gate as you can damage your turbo or other engine components! your waste gate allows excess pressure not needed on your exhaust side to escape.

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