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Unread 01-18-2007, 09:29 AM   #1
dblock16
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Vacuum leak?? Now what??

With the help of this board I think the loud loud whistle noise Im experiencing is some kind of vacuum leak. I have no idea what to do about it though. I realy need to solve this problem, it makes driving my jeep miserable. Should I take it to a mechanic?
Thanks
DOug

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Unread 01-18-2007, 09:48 AM   #2
ttrem
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I would suggest looking at the air hose coming from your PVC to the carb, then just doing a check with the engine running. ( pleases stay away from the fan ) I think most of the vac lines are going to be near your brake reservoir, so you could take a spray bottle and shoot a mist of water on the lines and see if you can see any bubbling. If you do then you found the leak. After that all you need to do is go to the autoparts store and tell em you need some vacuum hose.

If you cannt find it that way, then perhaps someone can suggest something else.
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Unread 01-18-2007, 09:51 AM   #3
JoonHoss
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Actually, with a vacuum leak, you won't see any bubbling.

use some carb cleaner, and listen for a change in RPM's.

if it's a big leak, you may be able to track it down by sound. try taking a piece of tubing, put one end to your ear, and move the other around, and listen for the whistle.

this may help you narrow down search area.


Hoss
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Unread 01-18-2007, 12:19 PM   #4
ttrem
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Quote:
Originally Posted by Joonhoss71
Actually, with a vacuum leak, you won't see any bubbling.

use some carb cleaner, and listen for a change in RPM's.

if it's a big leak, you may be able to track it down by sound. try taking a piece of tubing, put one end to your ear, and move the other around, and listen for the whistle.

this may help you narrow down search area.


Hoss
err maybe I was was remembering someones description to finding another problem. SOrry to the OP, after actually thinking it through the leak would be sucking so the water would get sucked in, thus not bubbling. This is gonig to drive me crazy trying to remeber what I was told to do that for.
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Unread 01-18-2007, 12:37 PM   #5
JoonHoss
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Quote:
Originally Posted by ttrem
This is going to drive me crazy trying to remeber what I was told to do that for.
leaks in a tire...

Hoss
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Unread 01-18-2007, 12:41 PM   #6
biblicone
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or exhaust leaks
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Unread 01-18-2007, 12:44 PM   #7
JoonHoss
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^^ true

also, if you were to manage to get water in through a vacuum leak, it would cause then engine to smoke, (much like using seafoam) for a bit, while it burned out the carbon.

Hoss
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Unread 01-18-2007, 02:20 PM   #8
ttrem
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Quote:
Originally Posted by biblicone
or exhaust leaks

that was it.
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Unread 01-18-2007, 02:47 PM   #9
danlanphear
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I have occasionally had problems with cheaper vacuum hoses collapsing under vacuum pressure and creating a squealing sound from inside. It's sort of like the sound you get when you deflate a balloon and the air makes the end of the balloon whistle like a reed.

If you sort of bend the hoses around a bit, you may find one that is sucked shut inside, but opens up again when the engine is off.

Just replace it with a better quality hose, and make sure it's not touching anything real hot.

$0.02
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Unread 01-18-2007, 07:06 PM   #10
Mr.Crowley
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when do you get this noise? Driving? Idle? 1/2 throttle? Can you make it come and go with the gas pedal while driving?
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Unread 01-18-2007, 07:16 PM   #11
dblock16
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Ive posted about this noise before and everyone started giving feedback and info on vacuum leaks but thats all over my head.

The niose is very loud, happens sometimes when idling, and sometimes when I let off the gas and pull up to a red light. If i punch the gas in nuetral sometimes I can get it to stop.

It sounds like it is coming from the back end of the engine, but I can't be sure.

So any suggestions?
Thanks
Doug
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Unread 01-18-2007, 08:23 PM   #12
Mr.Crowley
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does it get louder or go away if you press the brakes?Thats if you have power brakes..
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1984 cj8 350 on 35's..the wifes
[QUOTE=Me]
"offroad it, and wave then you might understand"[/QUOTE]
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My low Buck Rock Crawler project Project..Stop by and check it out..[URL="http://www.jeepforum.com/forum/showthread.php?t=497896"][B][COLOR="DarkOrange"]The lizzard Queen[/COLOR][/B][/URL]
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Unread 01-18-2007, 09:09 PM   #13
dblock16
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The brakes nor clutch seem to have no effect on the noise?????
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Unread 01-18-2007, 09:23 PM   #14
Mr.Crowley
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after its warmed up.Pull the filter off and wile running cup your hand over the top of the carb..not completely closing the venturies off but close,say1/2 inch..see if the idle raises or wants to die..thats a easy way to tell if its indeed a vacume leak..
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1984 cj8 350 on 35's..the wifes
[QUOTE=Me]
"offroad it, and wave then you might understand"[/QUOTE]
BLS Home Chapter... Where it all Started
:hahaha: yj

My low Buck Rock Crawler project Project..Stop by and check it out..[URL="http://www.jeepforum.com/forum/showthread.php?t=497896"][B][COLOR="DarkOrange"]The lizzard Queen[/COLOR][/B][/URL]
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Unread 01-18-2007, 09:48 PM   #15
dblock16
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Scrambled, thanks I will try that tommorow, Im replacing my power steering pump.
THanks
DOug
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