more throttle = low MPG - Saab 9000 Bulletin Board - Saabnet.com
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more throttle = low MPG
Posted by KeithG (more from KeithG) on Mon, 16 Sep 2002 16:28:33
In Reply to: MPG vs. PCV ???, Phil Schoen, Mon, 16 Sep 2002 14:02:32
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The checkvalve should NOT allow you to pressurize the crankcase. The flow is from valve cover TO the intake manifold and not the reverse. When you boost, fuel consumption goes way down, true. It sounds like there is something not quite right on the intake somewhere. I'd make sure that the AIC is working correctly, plugs are gapped and are NGKs, make sure that the hooter is not leaking vacuum and works fine. Replace any leaking vacuum hose.
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