vaccum leak?

94snake · 08-04-2004, 02:01 AM

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 · 08-04-2004, 07:39 AM

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 · 08-04-2004, 02:53 PM

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 · 08-04-2004, 03:24 PM

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 · 08-04-2004, 03:27 PM

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 · 08-04-2004, 05:40 PM

Quote:

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.

Andy

94snake · 08-04-2004, 05:42 PM

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

88fivepointoh · 08-04-2004, 05:49 PM

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 · 08-04-2004, 08:41 PM

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

Andy

LX5liter · 08-04-2004, 09:05 PM

Quote:

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

88fivepointoh · 08-04-2004, 10:25 PM

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 · 08-05-2004, 02:35 AM

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.

08-04-2004, 02:01 AM	#1
94snake Registered Member Join Date: Nov 2002 Location: Panama City Fl. Posts: 152	vaccum leak? 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!!!

08-04-2004, 07:39 AM	#2
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	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 __________________ 88 coupe 91 LX NMRA Pure Street 5120

08-04-2004, 08:41 PM	#9
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	The amount of brake cleaner required to find a vacuum leak wont damage squat. Andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

08-05-2004, 02:35 AM	#12
Capri306 Moderator Join Date: Sep 1998 Location: Grand Rapids, Michigan, USA Posts: 1,001	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. __________________ Capri306, Moderator The Mustang Works Online 1979 Mercury Capri 1987 5.0L Mustang LX Notchback 1993 5.8L Eddie Bauer Bronco

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08-04-2004, 02:53 PM	#3
88fivepointoh Registered Member Join Date: Aug 2002 Location: Rochester Posts: 553	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.

08-04-2004, 03:24 PM	#4
94snake Registered Member Join Date: Nov 2002 Location: Panama City Fl. Posts: 152	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

08-04-2004, 03:27 PM	#5
88fivepointoh Registered Member Join Date: Aug 2002 Location: Rochester Posts: 553	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.

08-04-2004, 05:42 PM	#7
94snake Registered Member Join Date: Nov 2002 Location: Panama City Fl. Posts: 152	alright man thanx for the info.....il try something !!

08-04-2004, 05:49 PM	#8
88fivepointoh Registered Member Join Date: Aug 2002 Location: Rochester Posts: 553	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.

08-04-2004, 10:25 PM	#11
88fivepointoh Registered Member Join Date: Aug 2002 Location: Rochester Posts: 553	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.