91 vacuum lines

[umphlett]

I recently bought a 1991 Explorer XLT with a 4.0 push rod engine.
There is a vaccum line missing, I have the line to the cruse ****rol, transmission, the air filter housing, the fuel regulator, and the purge canister.
I cant find where the missing line is. What I need to know is where does that line belong. Also, if I pluged off the leak and the engine almost dies. Second, does the 91 exporer with the 4.0 push rod engine have a EGR valve because I cant find one on mine. If it does where is it located.

Any help is appreciated
Thank you

 

[Vanquish502]

I believe theres a big one (like 1/2" ID) that goes to the brake booster. When that comes off the engine runs poorly.

 

[jgilbs]

What about the line to the PCV valve? If its not there, check the PCV valve (its on the head, almost right below the vacuum tree)
I dont beleive 91s had an EGR. I have a 92 and I dont have one, but my code scanner throws an EGR fault code for some reason.

 

[nserafini]

Is it the center hose connection on the upper intake inlet ?

If so, ( it should also be the largest ) it's for the brake booster -

In the link here, look at pic 5 ( he's holding it )

http://www.explorerforum.com/forums/showthread.php?t=132385&highlight=sea+foam

 

[Maniak]

On the '91 there is at least one connection on the octopus that is just capped off.. On my '92 there are 2 (I think '91 should be 2 also.. just not sure)...

The '91 has no EGR.. the PCV connects to its own connection on the side of the upper intake (not the ocotpus).. and the 2 big ones are for brakes and cruise control.. The rest you already mentioned..

~Mark

 

[91Expgeek]

On the '91 there is at least one connection on the octopus that is just capped off.. On my '92 there are 2 (I think '91 should be 2 also.. just not sure)...

The '91 has no EGR.. the PCV connects to its own connection on the side of the upper intake (not the ocotpus).. and the 2 big ones are for brakes and cruise control.. The rest you already mentioned..

~Mark

And on my 91 4.0L the cap on the octopus was lost - if you can hear a vacuum leak, check the octopus. I simply put a new cap on mine and all was well again.