low boost under 2500rpm - Saab Performance Bulletin Board - Saabnet.com
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low boost under 2500rpm
Posted by POB [Email] (more from POB) on Sun, 29 Mar 2009 13:52:26
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I moved my msg from the std board as I got no answer there...
I have very low (almost 0 boost) acceleration on my LPT until 2500 rpm then it picks up nicely. I have changed the crankshaft PS to no effect, checked vacuum hoses, etc... This happens when it's warm (either engine warm or warm outside) - I also changed the coolant sensor and the air temp/charge sensor since they looked like natural culprits when studying at wis, but not difference to be noticed; The bypass valve also hold vacuum so it looks like it's not dead either (was changed 20,000 miles ago). Finally, I have tried the car with the wastegate hose disconnected as well as witht he top BPC hose plugged (all these items tried one by one, in isolation)
I imagine a boost or vacuum leak would work at all rpm under boost, not only over 2500 rpm so I'm rather lost at this stage.
Has anyone experienced this before, does anyone have any lead ?
Thanks in advance
posted by 76.182.14...
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