Solved - Vacuum Pump Runs Continuously - Saab 9-5 Bulletin Board - Saabnet.com
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Solved - Vacuum Pump Runs Continuously
Posted by Mark in Marine (MN) (more from Mark in Marine (MN)) on Sun, 6 Mar 2011 13:11:13
In Reply to: Vacuum Pump Runs Continuously, Mark in Marine (MN), Fri, 25 Feb 2011 16:33:12
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Thanks for the comments Gene. And to John Myers for comments on brake booster replacement, too.
Long story short - I DID confirm a leak at my brake booster, but it was slight (two times located the hiss out of five shutdowns). I replaced it (see elswhere) and system held vacuum very well, but after a couple successful start/shutdown cycles the vacuum pump misbehaved again. Back to checking the BB -- traded the relay with the same part from headlamp cleaning circuit - NOW the vacuum pump runs the 2-3 seconds it should at start up and shuts down. When key is turned to run, but engine off it runs 2-3 seconds only -- this feels great! Now I can trust it for my wife and daughter to drive again.
Mark in Marine (MN) 1999 9-5 2.3LPT 165K miles
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