Could it be the turbo bypass valve? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Could it be the turbo bypass valve?
Posted by Mark Anderson (more from Mark Anderson) on Tue, 7 Jul 2009 12:47:25
In Reply to: Viggen boost is sick/ CEL repeatedly lighting, Skyrocket [Profile/Gallery]
, Mon, 6 Jul 2009 20:14:27
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Do you hear any strange sounds when you do go into boost? My 2000 9-3 had some turbo boost issues and I was getting a CEL and it turned out to be the turbo bypass valve was shot. The other symptom I had was when I accelerated and the boost gauge went into yellow and then I shifted to a new gear, on that brief spool down, I would hear a sound like a moaning wind (like a sound effect in a horror movie). Replacing the turbo bypass valve and using a new 3" intercooler hose on the left side of the TBV (when standing in front of the engine compartment) got rid of the sound, restored the boost, and got rid of the CEL.
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