94 explorer xlt auto...1 out of every 10 times 1-3 vacuum hoses blow off. anyone know a possible reason?

 

Check the vacuum tree the hoses connect to for transmission fluid,my guess is you have a bad modulator valve which is allowing fluid to be sucked into your intake and will also cause your other hoses that are attached there to blow off.

 

could that also be where my trans fluid is going? was thinking I may have vacuum hose routing problem..though as I looked there is a small hole in one of the EVR vac hose as well.. will changing the modulator valve possibly create more transmission probs?

 

That's exactly what was happpening to my 94 last spring and it was the modulator valve.

 

any trans problems since then?

 

None at all. Why do you think there should be?

 

just heard that it could contribute to problems. but I also have dissapearing transmission fluid..and suddenly oil was way over full..thinking I also have a routing issue.

 

Interesting, but no problems for myself. And you were losing tranny oil cause it was getting sucked into the engine due to the faulty valve. Not sure you have a routing problem IF everything else is functioning properly.

 

To prevent hoses from comming of vacumm tree I used small tie wraps at the end of the hoses, seems to keep them in place, Havn't had one come off in years, Use to be common for no apparent reason, But I think you should address the dissapearing transmission fluid issue first..

 

tried ties..they work great..any ideas about the dissapearing trans fluid???

 

I really think your just masking the problem by using ties. Those hoses are getting blown off for a reason. You're better off to replace that valve which is also more than likely the cause of the tranny fluid loss.

 

My 94 Explorer Auto Vacuum Hoses are blowing off too. Red Transmission Fluid is in the vacuum hoses. Thanks for your posts. I plan to replace the modulator valve as suggested above. I may have to also replace the rubber vacuum hose end fittings since the transmission fluid has made them expand and lose their grip. Thanks again.

 

WELCOME to the site, please read the Guidelines… Check out the list of forums and make sure you read the headings and Read First: notices in each forum.
Enjoy FTE

 

94 Expl Auto - Vacuum Modulator was easy to "find by feel" above the catalytic converter, but impossible to see. Fortunately, Ford put a bolt-on hatch in the floor plate above the transmission (you can see the hatch from below if it is there). Had to remove Rt Seat (6 bolts), Center Console, and peel back carpet. Consoles vary, but on mine, you access the rear bolts (4) through oval pop-out windows on the sides, and you get to the front screws by gently squeezing the plastic and separating the upper from the lower plastic. After removing the four hatch bolts, go underneath and push the hatch cover upwards from below. Modulator is on right of tranny at the end of the vacuum hose. Unbolt the heat shield and push it aside. The modulator is only attached by one bracket bolt above the modulator. After that just pull the modulator straight out. A metal bar one inch long sticks out of the modulator towards the transmission and will fall loose if the modulator is tilted down (another good reason to use the hatch rather than struggle from below). The metal bar must be recovered and inserted in the new modulator. Four "don't forgets": a drain pan for about a cup of spilled fluid, change the short section of rubber vacuum hose (buy 12 inches of 1/4 inch), leak check everything BEFORE closing the hatch, and the heat shield has some clips that need to be pushed into place on its lower edge after reinstallation of its top bolt. This job pays for itself with all the coins you find as you are pulling out the seat and rolling up the carpet. Have fun.

 

I had the same problem. Vaccum lines kept popping off, loss of tranny fluid with no apparent leak . I also was having tranny shifting problems on cold days. Trouble getting out of first gear until vehicle was warm. After I changed the modulator on the tranny all these problems went away and the my 93 was running smoooth like butter. Remember to Change your motor oil also . Overfilled Tranny & Motor oil Mixture can't be too good for the engine.