Vacum Leak Smoke Test

[old_master]

Forum members experience ranges from Saturday afternoon rookies to 40 year + professional veterans that make their living every day by diagnosing and repairing vehicles. The accuracy of the advice that is given here ranges widely as well. My only point of "back alley" is that with the higher technology of vehicles now, the tecniques that worked on an older vehicle, might not work as well any more, that's all. As I mentioned earlier, "Your onboard computer is an amazing piece of diagnostic equipment in itself, if you know how to use it." However, there are some things that should be left to a profesional.

Checking for engine vacuum leaks can be done very effectively and quickly by directing propane to suspect areas while watching fuel trim. With the engine at idle, fuel trim numbers will stabilize, introducing propane will affect these numbers immediately, identifying the vacuum leak. The smaller the stream of propane, the more accurately you can pinpoint the vacuum leak.

[danielsatur]

A good cigar is so much better than a $1200 smoke machine, or $80 Test!
By plugging the brake booster vacuum hose with thumb during puffs of smoke, the smoke is going take the path of least resistance.
The smoke test is so much safer, than flamable tests!

[danielsatur]

A 50cent Black & Mild shorty + a recycled grocery bag works the best!

See http://www.youtube.com/watch?v=zMok2...DAAE29CD944BE2