97 Explorer 5.0 intake vacuum leak HELP!!! | Ford Explorer Forums - Serious Explorations

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97 Explorer 5.0 intake vacuum leak HELP!!!

arpac90

Member
Joined
March 1, 2006
Messages
12
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2
City, State
Stephens City,VA
Year, Model & Trim Level
1994 XLT
arpac90
Ok I stopped by store and it was running great came out and started it up and just idled awful ran fine as long as you are moving but soon as you stop it just shakes and sounds awful,got home and looked under hood could hear a fairly loud sucking noise,found a fitting coming out of drivers side intake that looks like it should have a hose on it but there is no hose there.its a T fitting coming down from bottom of backside of intake there is a hose coming off backside but not on front side,if you put your finger on it the engine goes back to normal,the fitting is on drivers side near back of engine beside fuel rails.any help please is there just a cap on it or a hose that I cant find,also why woud it blow off since its a vacuum sucking in.I put a pic of it as my profile pic since I cant figure out how to put it here
 



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Thanks bud I cant make much of that as far as putting that to what I got,Did you see the pic in my profile?
 






This is likely part of the PCV system. Check very closely for broken or disconnected hoses or fittings. Alot of the PCV system on the V8's is very consealed. Try posting a pic if you can. Good luck
 






I still havent figured out where this hose is or what goes on this fitting,truck been sitting for two days now have no idea
 






Pics

go here to see the pics. photobucket.com/arpac90
 












Vid being uploaded now. Ill link it here when its done, Few more minutes. From the looks of things this is definitely your problem though. Good eye with catching it. That line is really buried in there.

 






OK guys mine just did this what is the fix a new black cap or ?
 






Watch the video. Its a tube that runs from the side of the intake manifold to the front of the intake manifold. Im guessing 1 inch tube.
 






I watched the video I see that its a tube....my question is why is it poping off I can just put the little black vacuum cap back on and it runs great. Then the cap pops off again and I am back to square one I went to ford to try and buy the cap or tube assembly and they could not find it in there system.

So now what?

Thanks in adavnce.
or
Actually it would be nice to know what it is called....is it pcv or vacuum line for ?
 






Ok well got mine fixed yesterday,it was just capped,the hose in the video actually runs to the PVC,went and looked at my brother in laws moms Mountaineer same engine and hers wasnt even T it had just one line back of the backside of engine and no fitting forward so we just used a bypass cap and its back to normal now
 






Ok well got mine fixed yesterday,it was just capped,the hose in the video actually runs to the PVC,went and looked at my brother in laws moms Mountaineer same engine and hers wasnt even T it had just one line back of the backside of engine and no fitting forward so we just used a bypass cap and its back to normal now

Huh. Something about that dont sound quite right. Is your PCV in place in the rear of the lower intake manifold? To me it sounds like you plugged the vacuum line to the PCV and the PCV is missing.

Do this. Grab a flashlight. Climb up over the engine looking down at the very rear of it. You should be looking straight down from the large wiring connector on the firewall. There, at the back of the lower intake manifold is the PCV. It should have a vacuum hose attached to it. You should be able to easily pull the PCV out of the intake manifold(if you can get your hand in there). Is this all there?
 






Yeah we pulled that hole hose out that you showed in video and it runs from front of intake underneath strait to pcv,like I said the Mountaneer has the same engine and the T I had hers only had one line coming out same spot
 






Yeah we pulled that hole hose out that you showed in video and it runs from front of intake underneath strait to pcv,like I said the Mountaneer has the same engine and the T I had hers only had one line coming out same spot

So you have no PCV valve in there? Or the PCV is there and you plugged the vacuum line to it? You should hook that vacuum line up to the PCV valve. You could run into a host of problems if the PCV system is blocked or bypassed.

Here is a link with pics that show the PCV setup on the V8. First 2 pages.
http://www.explorerforum.com/forums/showthread.php?t=149983
 






Yeah the hose that he shows in the video runs from the bottomside of front of intake back to PCV,it is not what came unhooked on my truck.mine ended up just being capped on front side of T in pic.My PCV is intact like it is supposed to be
 






Just replace the rubber cap and go on your way. Sometimes they blow off after a failed start when you don't crank it long enough. If it keeps happening try a zip tie or small hose clamp to keep it on.
 












I have a 97 Mountaineer AWD. That hose goes to the front of the engine and tees off to 2 smaller hoses. 1 going to the passenger side and 1 to the driver side. Not sure what they go to though. The 1 on the driver side goes under the battery tray and the 1 on the passenger side goes under the air filter box. Hope this helps you in some anyway.
 



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Hello. I just came on here looking for help because of the same problem, and mine was a cap that popped off. I drove home in my Explorer last night, and it ran fine, but this morning it stalled repeatedly at startup, and even though I got it to idle a little better, I could clearly tell something was wrong, in addition to the bad idle, I heard the vacuum leak. I popped the hood, and saw the cap sitting on my exhaust manifold, but couldn't figure out where it came from. After seeing the pics posted by arpac90, I went out and looked, to see the spot on the manifold where it went. I have now checked out everything else, and the PCV is as it should be.

After reading everyone's post, it sounds like there is more than one configuration to the vacuum lines on these engines. I just figured that I'd post up my info to possibly shed additional light on the subject.
 






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