Tips for finding vacuum leak
07-25-2007, 06:06 PM
#1
Tips for finding vacuum leak Tried searching, guess how that went... 
Just wondering if anyone has any good tips on how to locate a small vacuum leak. This isn't for my Firebird, it's my DD Escort. I'm pretty sure it has a small vacuum leak somewhere, because A: It's knocking, and B: sometimes I lose HVAC controls when enough throttle is applied, which are vacuum operated. I have tried to listen for a leak but I doubt I would be able to hear it over the sound of the engine.
Just wondering if anyone has any good tips on how to locate a small vacuum leak. This isn't for my Firebird, it's my DD Escort. I'm pretty sure it has a small vacuum leak somewhere, because A: It's knocking, and B: sometimes I lose HVAC controls when enough throttle is applied, which are vacuum operated. I have tried to listen for a leak but I doubt I would be able to hear it over the sound of the engine. 
07-25-2007, 06:09 PM
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07-25-2007, 10:32 PM
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Originally Posted by Formula413
Tried searching, guess how that went... Just wondering if anyone has any good tips on how to locate a small vacuum leak. This isn't for my Firebird, it's my DD Escort. I'm pretty sure it has a small vacuum leak somewhere, because A: It's knocking, and B: sometimes I lose HVAC controls when enough throttle is applied, which are vacuum operated. I have tried to listen for a leak but I doubt I would be able to hear it over the sound of the engine.
Just wondering if anyone has any good tips on how to locate a small vacuum leak. This isn't for my Firebird, it's my DD Escort. I'm pretty sure it has a small vacuum leak somewhere, because A: It's knocking, and B: sometimes I lose HVAC controls when enough throttle is applied, which are vacuum operated. I have tried to listen for a leak but I doubt I would be able to hear it over the sound of the engine.
07-26-2007, 12:21 AM
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Originally Posted by krayzie7th
use break cleaner or something of that sort and spray it around, your idle should change when it goes by the leak.
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07-26-2007, 02:07 PM
#8
Originally Posted by GOaT Cheese
Then when the engine catches on fire, he won't have to worry about the leak.
the auto-igniton point of brake clean is over 500 degress up to 1000.... plus there is no reason to spary brake clean anywhere near the headers.
07-26-2007, 03:40 PM
#9
Originally Posted by azxic
the auto-igniton point of brake clean is over 500 degress up to 1000.... plus there is no reason to spary brake clean anywhere near the headers.
One of the tips I read on that site was to use propane to find the leak, that seems kinda dangerous too. It also said you need to unplug the idle air control motor or it will automatically correct the idle and you won't notice the change. Has anyone actually done it that way?
07-27-2007, 12:10 AM
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Originally Posted by azxic
the auto-igniton point of brake clean is over 500 degress up to 1000.... plus there is no reason to spary brake clean anywhere near the headers.
07-27-2007, 01:36 AM
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Originally Posted by GOaT Cheese
and have personally flamed 3 customer vehicles using brake cleaner when I shouldn't have, One time I simply set a can of brake cleaner on top of a battery, talk about fireworks, it looked like one of the flaming Chinese pinwheels dancing around under the hood.
