Re: i think i need a new turbo :/ - Saab 900 Bulletin Board - Saabnet.com
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Re: i think i need a new turbo :/
Posted by John G (more from John G) on Sat, 14 Jan 2012 12:15:43
In Reply to: Re: i think i need a new turbo :/, sullls saab [Profile/Gallery]
, Sat, 14 Jan 2012 05:32:20
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Some boost taper is normal. Check for vacuum leaks. You could also raise the base boost using a helper spring. The extra tension will help to keep the wastegate flapper from being pushed open by exhaust gases. But if you go too high, you'll get boost spikes.
Like someone mentioned, that buzzing sound could be at apc soleniod in which case the case is cutting your boost because it detected engine knock. Try removing the knock sensor, wrapping it in a towel, and placing it somewhere in the engine bay with little vibrations. Take it for a drive and see if it helps. You need to realign the knock sensor when reinstalling. If the apc if cutting boost, then it should not go lower then base boost.
posted by 70.162.23...
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