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Date: Mon, 19 Jul 2004 07:07:18 -0400
From: KeithG <noonenospamay.com>
Subject: Re: Turbo leakage on 86 900T


Check the Hooter valve. The vacuum line to it should not leak. My best guess is that the checkvalve on the vacuum reservoir for the HVAC system (RHS front fender) is broken. I just went through this recently. The best fix is to repair the seal the best you can so that it holds vacuum then put a real checkvalve (like the one in the crankcase vent line) in the line to it. This is not easy. I was able to disassemble the checkvalve and reassemble it with the existing seal and it does hold vacuum now. Another possibility would be to remove the complete checkvalve and fashion a nipple then have only the external checkvalve. Let us know how it goes. The checkvalve is poorly designed and will break seal after 10+ years. KeithG Grunff wrote: > Charles Stoyer wrote: > >> My 86 900T has been making a "SHHHHHH" sound for about 3 years now >> when the >> turbo is boosting. I did not initially notice a lack of power, but now, >> going up steep hills at 6,000 feet elevation, I do notice a lack of >> power. >> >> As part of a clutch hydraulic hose replacement (see earlier >> post/thread, if >> interested) I did take the turbo plumbing apart and took all the relevant >> boots to Mile Hi Body Shop in Denver, where they found two of four boots >> suspect and I bought used replacements. >> >> No change. >> >> Is it the Turbo or the Waste Gate? The plumbing seems to be just fine, as >> far as I can tell. > > > > Are you saying you're still leaking boost? What does your boost gauge > read when going up a moderate incline in 2nd/3rd gear with the throttle > wide open? >

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