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Aurora40 · 05-05-2011

If it holds vacuum with a hand pump and the engine off, why would it hiss at idle? Everything should be the same, except the engine vacuum supply line also has vacuum. I believe that comes from the driver's side front of the plenum?

05-05-2011	#9
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,704	Re: Stupid Question..... If it holds vacuum with a hand pump and the engine off, why would it hiss at idle? Everything should be the same, except the engine vacuum supply line also has vacuum. I believe that comes from the driver's side front of the plenum? Last edited by Aurora40; 05-05-2011 at 08:06 AM.