how do I check function of vacuum advance? - Saab Performance Bulletin Board - Saabnet.com
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how do I check function of vacuum advance?
Posted by p-loc (more from p-loc) on Mon, 7 May 2001 02:50:29
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car is 88 9Kt with plastic check valve/can inline with vacuum line to distributor. I was curious as to the function of that plastic valve, so I tried a few things. reversed the valve (should limit boost retard, possibly give more vacuum advance?)- no difference off boost, of course apc kicked in early on boost without the retard. disconnected the signal line completely(plugged all fittings)- again no discernable difference off boost, and low boost without the retard. Since I couldn't tell the difference off boost with the vacuum line disconnected, I'm questioning whether the vacuum advance is working at all. Any easy way to check/fix this?
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