Re: Dreaded boost problum back :-( - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Dreaded boost problum back :-(
Posted by Nsteph (more from Nsteph) on Wed, 2 Sep 2009 19:38:43
In Reply to: Dreaded boost problum back :-(, Jeff, Wed, 2 Sep 2009 19:21:01
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Take a look at the boost control valve (BCV). The top line communicates with the evap control system. There is T and two one-way valves, which can fail. The upper valve is especially prone to failure since it sees high pressure from the intake. When this valve is bad, it creates back pressure that prevents the normal fuctioning of the BCV and limits boost.
Of course there are other possiblecauses, including a bad BCV or or bad MAF sensor...etc.
To check for the bad check valve, disconnect the upper hose of the BCV and block it with a plug. This allows the BCV to vent out. It is important to block the hose for emission control. The car will drive fine with no CEL. You can change the value later. If you don't notice any increase in boost, then look for other problems.
Hope this helps.
posted by 24.147.155...
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