Have a vacuum leak

[Petrucci914]

Hey everyone,I have a vacuum leak somewhere. I hear a whistling sound when first giving it gas and my idle is very poor. I've checked every hose that I can see and haven't seen any cracks or anything. I noticed some moisture where the dipstick for the engine is......maybe the supercharger isn't sealed all the way? I'm not sure. Any hints on finding a vacuum leak? This may be responsible for lots of my issues and why I'm not hitting full boost.

[Petrucci914]

Nothin?

[RIT]

One method is to spray a "carb cleaner: around the engine/hoses. When it gets sucked into the engine via the vacuum leak, the engine rpms should change to let you know that you are in the correct area to look closer.

[Petrucci914]

I don't know if I can do that, I'm supercharged - not supposed to spray carb cleaner or anything in/around the throttle body while running. Any other ideas? I just know this is the source of my problems......maybe the SC'er isnt bolted on tight enough.......who knows.

[engineertwin2]

Only way I've found vacuum leaks before is using the old stethoscope. But, admittedly, I have only had one real hard to find leak.

[kevera]

Did you use the copper stuff when you put on your s/c.(You sprayed both sides right)You can also check your TB gasket.Other wise you'll have to listen for leaks while raising rpms.

[Sublimewind]

Quote, originally posted by Petrucci914 »I don't know if I can do that, I'm supercharged - not supposed to spray carb cleaner or anything in/around the throttle body while running. Any other ideas? I just know this is the source of my problems......maybe the SC'er isnt bolted on tight enough.......who knows.Starting fluid insted...?? if you took it to a shop, they would hook the system up to a vacuum pump and pull(try) a vacuum on it and go from there...

[Petrucci914]

Quote, originally posted by kevera »Did you use the copper stuff when you put on your s/c.(You sprayed both sides right)You can also check your TB gasket.Other wise you'll have to listen for leaks while raising rpms. Ya, I used the copper spray-a-gasket. After I got my motor mount inserts installed it idled pretty bad and then I took off the TB and cleaned the IACV and it was good for a while. Now it's back. I'll be reinstalling the new TB this weekend and go from there. I know a shop in GB that uses the smoke machine for vacuum leaks, so I guess I'll go from there.

[epcIII]

Quote, originally posted by Petrucci914 »Hey everyone,I have a vacuum leak somewhere. I hear a whistling sound when first giving it gas and my idle is very poor. I've checked every hose that I can see and haven't seen any cracks or anything. I noticed some moisture where the dipstick for the engine is......maybe the supercharger isn't sealed all the way? I'm not sure. Any hints on finding a vacuum leak? This may be responsible for lots of my issues and why I'm not hitting full boost.I think I'm having the same problem but couldn't find the leak either.

[BlueCrush]

Quote, originally posted by epcIII »I think I'm having the same problem but couldn't find the leak either. You have a supercharger , too?

[epcIII]

Quote, originally posted by BlueCrush »You have a supercharger , too?Oops! No I don't have supercharger but I also hearing some kind of 'hiss', esp. right before the engine revs when giving it gas.