vaccum leak?

[94snake]

just picked my car up from the performance shop today and he said he thinks its a vaccum leak.....it sqeals pretty loud, is it possible to hear a vaccum leak i belive the leak is right there tween the lower and upper plenum........other than that she runs great......any help!!!

[andy669]

With the engine idling, spray some flammable brake cleaner in the area that you think is leaking. If the idle raises up, then you have a leak.

Andy

[88fivepointoh]

I wouldn't spray brake fluid, it will kill your sensors in a heart beat. A little propane is best, or spray some water from a water bottle. when you mean squeal, how loud? a loud leak would indicate a big leak, which the car shouldn't run well if at all.

[94snake]

it sqeals pretty loud...i can hear it from inside of the car driving it.....but other than that it runs farely well....it seems to quiet a little when i accelerate....but at idle its farely loud...so you suggest water...and if the idle raises its a vaccum leak ?? thanx guys

[88fivepointoh]

if you spray water the car will stumble. if its pretty loud, sounds like it could be something else.. a leak that loud would cause the car to not run. thats me 2 cents.

[andy669]

Originally posted by 88fivepointoh
I wouldn't spray brake fluid, it will kill your sensors in a heart beat. A little propane is best, or spray some water from a water bottle. when you mean squeal, how loud? a loud leak would indicate a big leak, which the car shouldn't run well if at all.

Not brake fluid, brake cleaner.

Which sensors are you referring to that it will kill in a heartbeat? I must be getting real lucky everytime I do this. :confused:

Andy

[94snake]

alright man thanx for the info.....il try something !!

[88fivepointoh]

Any brake related products are not to be burned in a motor. If you look on cans, and cleaners, you'll see it says, " safe for 02 sensors " like on fuel injector cleaner etc. etc.. there is a reason for that. it leaves residues that damage the sensors. unless its TBI cleaner, you should never burn them in a EFI car or anything with 02 sensors, or intake sensors etc. Thats a general rule with all cleaners. like you shouldn't use gum out on a efi car etc.

[andy669]

The amount of brake cleaner required to find a vacuum leak wont damage squat.

Andy

[LX5liter]

Originally posted by andy669
The amount of brake cleaner required to find a vacuum leak wont damage squat.

Andy

I agree, it will all be burnt off before it reaches the sensors. I wouldn't try spraying it directly into the throttlebody though :eek:

[88fivepointoh]

you can spray it if you want, I would never spray a product down your intake, your just adding more variables to the mix down the road. My 2 cents.

[Capri306]

Just spray some Natty Ice on the gasket area. If your car gags, it's a vacuum leak. If not, you haven't wasted much of anything to find out. End of discussion.