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Help finding a vacuum leak

 
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Old 10-06-2010, 09:16 AM
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Help finding a vacuum leak

My cars got a vacuum leak....somewhere. Just don't really know where it is exactly.

When I open up the hood you can hear a suction/hissing sound, which is indicative of a vacuum leak. It sounds like its coming from the IM.

I already replaced two vacuum hoses, one had a leak the other was a tube from the IAB unit got broken off. I fixed both but the suction noise is still there.



As far as I know there are two effective ways to find a vacuum leak. Number 1 would be using propane. Number 2 would involve a mechanics stethescope with a hole in the end. I don't have propane and I couldn't find a proper stethescope.



My other thinking is maybe it isn't a vacuum line, but an IM or TB gasket. Is it possible for these to leak and make the same sucking/hissing type sound?



Also, is there any other effective ways to find a vacuum leak? I tried soap and water and that didn't help at all. The other vacuum leaks I found pretty much just by poking around and a little guesswork.
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Old 10-06-2010, 03:55 PM
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Re: Help finding a vacuum leak

You could try a spray bottle of watter. Should drop the RPMs when it's sucked in the vacum line. Or you could try carb cleaner, that will make it rev up when sucked in.
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Old 10-06-2010, 04:00 PM
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Re: Help finding a vacuum leak

Quote:
Originally Posted by havikprelude View Post
My cars got a vacuum leak....somewhere. Just don't really know where it is exactly.

When I open up the hood you can hear a suction/hissing sound, which is indicative of a vacuum leak. It sounds like its coming from the IM.

I already replaced two vacuum hoses, one had a leak the other was a tube from the IAB unit got broken off. I fixed both but the suction noise is still there.



As far as I know there are two effective ways to find a vacuum leak. Number 1 would be using propane. Number 2 would involve a mechanics stethescope with a hole in the end. I don't have propane and I couldn't find a proper stethescope.



My other thinking is maybe it isn't a vacuum line, but an IM or TB gasket. Is it possible for these to leak and make the same sucking/hissing type sound?



Also, is there any other effective ways to find a vacuum leak? I tried soap and water and that didn't help at all. The other vacuum leaks I found pretty much just by poking around and a little guesswork.
those two methods mentioned would work. But I too think I have a vacuum leak but I can't hear it, I just notice a rough idle. Most of these hoses will probably be the original ones, so they are hard and most cases dry rotted. Its a possibility that the hose is connected but leaking around where the hose itself is weak. I will be in the process of replacing all my vacuum lines pretty soon.

Carb cleaner would be a good way to check for leaks as you'll hear the engine rev up a bit when you hit near the leak. I use this method to find gasket leaks as well.
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Old 10-06-2010, 09:15 PM
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Re: Help finding a vacuum leak

just take a can of carb cleaner and spray a spot where you think the leak is coming from. if you hear the motor rev up you found the area where the leak is.
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Old 10-07-2010, 12:49 AM
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Re: Help finding a vacuum leak

Rob is correct on that. I do the same thing... Well I use brake part cleaner.
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Old 10-07-2010, 07:30 AM
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Re: Help finding a vacuum leak

Ah...well I pretty much just said fck it, I'm going to be replacing all the hoses today. I'm done fckin around lol. Just gotta pick up some more hose, which is like $0.20 a foot or something so its not bad, plus I get a discount on top of that.
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Old 10-07-2010, 09:10 AM
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Re: Help finding a vacuum leak

**** a true player never parts for his hose.
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Old 10-07-2010, 09:21 AM
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Re: Help finding a vacuum leak

Not sure what that means but ok.
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Old 10-07-2010, 09:52 AM
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Re: Help finding a vacuum leak

It was a play on words... hose and hoes...
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Old 10-07-2010, 10:26 AM
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Re: Help finding a vacuum leak

ohhh sht. I didn't catch that lol.


:facepalm:
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Old 01-15-2014, 03:57 PM
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Re: Help finding a vacuum leak

nice having the same issue and it sucks
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