How does one do a vaccum leak test?

 

Not to sure why you would do one. Are you trying to target one system that is after one of the multiple check valves? Or are you just checking what your motor is pulling at idle or part throttle?

 

I'm getting maf psm lights ... And at times stalling when coming to a stop light ... Had a boost leak done ... And no leaks ... I figured I'll check for vac leaks before changing the throttle body ... Which is what they recommended ...

 

Try smoking the car right through the intake. the smoke will show more.

 

Seems like you East Coast guys'll smoke anything Tim.....lol

 

haha.. as this thread goes up in smoke!

 

thanks guys!

 

I had to leave my car on the smoke machine for quite some time to find my leaks. Keep it on and start looking all over. The intercooler ducts, under the car, and under the front cowl. once thats square then run your 30-40psi boost test. hope this help you.

 

I had a similar problem,PSM and ABS lights going off and stalling at lights. The second phase on my alternator was bad.