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91 explorer phantom vacuum leak

darkarrow

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July 17, 2005
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City, State
Edmond, Ok
Year, Model & Trim Level
'91 Eddie Bauer
i have a 91 EB explorer and i dont know where my vacuum leak is coming from. the sound originates behind the vacuum tree area on the driver side of the intake manifold. i have replaced many hoses and checked many for leaks, but i havent found any yet. if anyone knows of an odd place where there may be a vacuum leak in this area, please help me find the problem, any help is greatly appreciated.
 



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Rhett

Let Them Eat Cake
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May 13, 2000
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City, State
Cape Girardeau, MO
Year, Model & Trim Level
94 Sport 4x4
It's very difficult to diagnose from what you've posted. How do you know it's a vacuum leak? Perhaps the IAC is noisy. Do you have any of the symptoms of a vacuum leak in the driving condition of the vehicle?
 






pinoyesv6

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July 11, 2005
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City, State
Maryland
Year, Model & Trim Level
'91 XLT
there's an extra nipple on the back of the vacuum tree. it doesn't have a hose going to it but usually there's a cap. the cap fell off of mine and thats when i got the leak. i just plugged it up with a hose i tied into a knot and the problem went away.
 






Longjohn119

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April 22, 2005
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City, State
Davenport, Iowa
Year, Model & Trim Level
1991 Eddie Bauer
Squirt a little oil around the seams (gaskets) of the intake manifold with the motor running ... the oil will temporarily seal any leak and the RPMs will jump a little and then fall back as the oil sucks through and the leak becomes active again ... if nothing happens then the gaskets is probably alright and the leak is elsewhere ... this motor is known for blowing intake gaskets and this is the best way I know of to find out
 






Mr. Stroker

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May 9, 2005
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City, State
Mempis, MI
Year, Model & Trim Level
1992 Exploder XLT
this is a bit dangerous and not the best way but the old guy down the street from me uses a propane tank(not lit) and when u get a leak it sucks in the propane and drops the idle.

its not the best way but it is effective so try at your own risk
 






jreece04

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April 9, 2005
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City, State
Tucson, AZ
Year, Model & Trim Level
'92 XLT
I have heard of using carb cleaner and spraying it around the engine compartment and you are supposed to see an increased idle if it hits a leak. it seems more safe then propane and is pretty cheap.
 






91Expgeek

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July 27, 2005
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City, State
San Diego, CA
Year, Model & Trim Level
'91 Explorer
pinoyesv6 said:
there's an extra nipple on the back of the vacuum tree. it doesn't have a hose going to it but usually there's a cap. the cap fell off of mine and thats when i got the leak. i just plugged it up with a hose i tied into a knot and the problem went away.
Same thing just happened to me - with the engine running (and the wife keeping it running) located the vacuum leak on the back of the little octopus (vacuum tree) with my finger - plugged it with my finger and idle went to normal and vacuum leak sound quit. That "extra cap" was missing. Replaced it with a rubber cap from my "rubber junk" drawer (I've got *lots* of junk drawers) and the problem was solved. Hope this helps somebody else. -=dave=-
 






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