Re: Problem fixed! Jim O had it - Saab 9000 Bulletin Board - Saabnet.com
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Re: Problem fixed! Jim O had it
Posted by Garret [Email] (more from Garret) on Sun, 18 Jan 2009 16:57:30
In Reply to: Re: Thank you David, I didn't think of that yet, Garret, Fri, 16 Jan 2009 09:56:51
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I can't believe I drove with this nusiance for almost two years. The cause was somewhat obvious once I thought about it. The TCS throttle is actuated by vacuum. That vacuum can be cut by the safety valve if the ECU determines so. The vacuum supply to the safety valve is protected from turbo boost by a check valve. My valve was not checking. Every time boost came up it backed off the throttle until I was driving via the limp mode cable. If I let off the gas for an instant the vacuum would recharge, only to bleed off again as soon as boost came up. It's good for gas mileage but very annoying after a while. I swapped the check valve for the one in the crankcase breather line and it drove like a new 242,000 mile car...
Thanks a bunch everyone,
Garret
posted by 24.62.24...
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