Use whatever spray tickles your fancy -- brake cleaner (tell me THAT doesn't stink when it gets sucked into engine), electrical contact cleaner, whatever. The point is to direct an aimable stream of something that will interfere with combustion at suspect locations. Can't just blanket engine willy nilly because you'll never know where leak is (can't use foaming cleanser). BTW: This isn't a "trick". It is a diagnostic tool. Point isn't to hide problems but to expose them. If you're worried about safety, check out Message #33577... I guess each owner is entitled to do with his or her car as he or she wishes. My ultimate goal is an engine that idles 100% constant. Am SOOO close (only leak I can find now is crank seal in timing chain cover). And this is without "benefit" of a throttle bypass motor. PS: I'll let incompetent mechanic inference slide because DeLo shares driveway with 7 domestics, all of which purr like big cats (well, the AMC purrs like a kitten). Based on the numbers, JZD created problem, not me... Bill Robertson #5939 >--- In dmcnews@xxxxxxxxxxxxxxx, "IN2TIME" <Gary@xxxx> wrote: > OK, Even I have used Carb Cleaner to test for vacuum leaks. > > But remember the warnings. Carb Cleaners are very volatile, poisonous > mixtures of Xylene, Alcohol, Acetone, etc., and they can even dry out and > deteriorate rubber with extended and/or repeated exposure. > > Sometimes an old mechanics trick really is an old mechanics "TRICK". If he > sprays the injector seals, etc. with Carb Cleaner every time he works on the > car, he will eventually find the leaks he caused. > > :-) > > Just my 2 cents. > > Gary > IN2TIME