Best way to check vacuum leaks?

[Gabriel33]

Just wanna know the best way to check for a vacuum leaks and what to do when one is found?

 

[turboSR5]

the one that I find to be the best is to slightly pressurize the intake with 1-2 psi of compressed air. you can then use a lightly soapy mixture of water to coat the lines, where you see bubbles forming will be a vaccuum leak. If you can't regulate the compressed air below 5 psi, do not attempt!!

Another method I use if I can't use compressed air is either a propane torch (unlit of course) or a can of carb cleaner. With the engine running spray around the hoses and listen for any changes in idle speed.

When you find leaks you may have to replace the lhose, or just clean up whatever it is attached to if it is leaking right at the start or end of the hose.

 

[t4r4life]

get a fish tank pump and a cigar, then blow smoke unto the intake with TB open, and dont worry cigar smoke is completely safe for engines

 

[fourwd1]

Spraying carb or brake cleaner, the idle should drop when you find a leak on a vac line or gasket.

 

[coloradodave]

What about replacing all the lines? has anyone done this? Is there a diagram for all the vac lines?





-codave

 

[GonOvr]

What about replacing all the lines? has anyone done this? Is there a diagram for all the vac lines?





-codave

Replacing all the lines would definitely not be necessary, especially if it was a bad intake gasket or TB.

There is a diagram in the service manuals.

 

[coloradodave]

Ya i was thinking it would be a bit over kill. Mine has a little bit of a bouncy idle, but i still need to do the plugs.




-codave