Thanks for the quick replies. I’ll have to think a bit more about this.
By the way a quick search came up with these articles:
http://www.popularmechanics.com/cars/ho … uum-leak-2
Similarly, you can spray water or motor oil onto a suspected leak and achieve the same end. When the water gets sucked into the leak, it momentarily interrupts the extra O2 stream, and the engine’s idle will change.
http://www.moparmagazine.com/2010/may-j … ks.htmlThe recommended method to find the leak is to spray water along that parting line, N (you can spray water at the throttle body-manifold mating surface, too). If the idle speed changes, you