Topic: Checking for vacuum leaks.

[Rufus2010]

What's a good way to check for vacuum leaks in the intake tract? I seem to remember once using an unlit propane torch and listening for the engine to increase in speed when it started sucking in the propane vapors.

Any thoughts?

[Muckinfuss]

I've always sprayed WD-40 or similar at seams and connections and watched for smoke at the exhaust.

[evanphi]

I use unlit propane.