Found turbo boost, was there all along - Saab 9000 Bulletin Board - Saabnet.com
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Found turbo boost, was there all along
Posted by hmr [Email] (more from hmr) on Mon, 12 Apr 2004 18:11:04
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'88 9kT. Had only base boost, about middle of yellow, never higher. Disconnected W-hose, boosted higher, didn't overdo it to prevent damage. Board members suggested checking timing, plugs, vacuum hoses, etc,etc. No result since logic would say that boost-cycle worked well, but control- curcuit limited boost. Anyway no change, without wastegate control still boosted ok, started checking sensors for APC-control and found one wire broken at knock sensor. Lesson learned: If pressure goes past base-boost with wastegate-control disconnected you can assume that boost system operating and you can fine-tune later, after checking why APS-system limits boost...except if you like wrenching, then you can take the opportunity to start rebuilding engine.
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