Help with Oscillating Boost! - Saab 9000 Bulletin Board - Saabnet.com
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Help with Oscillating Boost!
Posted by Sterling98 [Email] (more from Sterling98) on Fri, 2 Nov 2007 19:10:39
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In the last week my '98CSE has started to fluctuate boost under part trottle. Usually swings past red and back to yellow about four times before reaching top gear. It is not causing fuel shutoff, just a rapid build up and drop in boost pressure that can be felt and seen on the gauage at about 1 second intervals. Also does it under cruise control if I resume from a low speed. I thought turbos were limited to base boost under cruise? Is this a partial failure of hooter valve? BCV? I'm even wondering if I have a cracked hose that is blowing open under pressure.
Plugs, fuel pump, and filter are new. Gas is 93 Octane. ECU is Jak Stoll tweaked but everything was fine until this week. Any thoughts?
posted by 71.114.81...
Posts in this Thread:
- Help with Oscillating Boost!, Sterling98, Fri, 2 Nov 2007 19:10:39 <-- Viewing This Message
- Ahh, it's the'past red' thing that threw me..., AMG , Sun, 4 Nov 2007 14:31:28
- Base boost in cruise >, Bill Davies, Sun, 4 Nov 2007 08:08:52
- Re: Help with Oscillating Boost!, AMG , Sat, 3 Nov 2007 19:36:15
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