Recently I have been chasing a problem that caused my engine to idle rough and even die if idled too long. Also, I could not let the engine get anywhere near idle with it in gear or it would start bucking. I cleaned the MAF and IAC with no improvement. I used the propane method to check for idle leaks and found none.

I determined it had to be the PCV valve. Once replaced, there was still no improvement. I went back to possible vacuum leak. I took the cover off of the throttle body and could here a hissing sound near the the front of the intake manifold. I got out the propane bottle and could still find nothing. I then resorted to starter fluid and sure enough I found the leak. There was a small crack in the hose that connects the PCV tube near the front of the intake manifold.

Ah I thought, that is a simple fix and headed to the Ford dealer for a replacement. They looked in up and came back with the entire PCV tube and hoses on each end. Apparently they don't sell just the one hose. I was not going to pay almost $40 to replace a little hose. I went back home clened it up really well then built up a thick layer of silicone all over the tube with an extra thick layer in the cracked area. After letting it cure overnight I took the truck for a drive and now all is well.

Now, what I would like to know is if there is anyplace I can buy just the rubber hose. I know my fix will last for a long time but would still like to have a correct replacement hose.

Also from the condition of this hose I would expect others to have problems with it. I suggest inspecting it well. Mine was cracked in one place at the top but was very soft all along the top area. It would not take much pressure to break it without the silicone to reinforce it.

 

You could probably find something at Home Depot

 

Can you post a small pic of this fitting on the engine please, so I know where to look..
Thanks
Manie

 

crazy clue the crack and electric tape around the entire hose, haha thats what i would do

 

Crazy glue and electricians tape would be a decent temporary fix but would probably not last long term. The silicone fix is working perfectly so far and should last a long time.

I can take a picture but it will take a couple days. It is not difficult to find. It is right under the top radiator hose on the right side of the intake manifold. It helps to remove the plastic throttle body cover so you can move the radiator hose out of the way. The radiator hose actually rests on this PCV elbow hose and in time may wear through the PCV hose.

This elbow hose connects to a black, hard, plastic tube (about 1/2" diameter) that runs along the right side of the intake manifold and around the back to the PCV valve.

 

Here are some pictures of the PCV hose that I repaired.

The first one is with the radiator hose moved out of the way to get a better view of the PCV hose. The PCV elbow hose I repaired is the one with the silicone built up on it between the radiator hose and the smaller rubber hose.

The second picture is with the radiator hose in it normal place. You can still see part of the PCV hose below it.

 

I just replaced this hose on my truck yesterday.

Electrical tape didn't last anytime as a temp repair. I also did the silicone thing and it worked well, but the hose continued to deteriorate and the leak started again.

Also expected to get just the rubber elbow part at the Ford place. Oh well I didn't have time to mess with looking for my own replacement part so bought their assembly. Paid $24.16 + tax.

 

I expect the hose to continue to deteriorate. That is why I encapsulated the entire exterior center section of the hose with silicone. It is almost like silicone hose over the original rubber hose.

I am keeping an eye out for a less expensive replacement. okfarm, if you found it for under $25, there is a good chance I can too. Do you still have the part number for the complete PCV tubing? I forgot to get it from the dealer.

 

4L5Z-6758-HA

I bought it at Billingsley Ford in Ardmore, OK.

And I did a yahoo search for that part # just now and found this: http://www.amazon.com/Ford-Motor-Com.../dp/B000NTHRCM

That part number search also turns up a thread on mysporttrac.com that has a guy who took the elbow into Autozone and matched up a hose. It was also mentioned that having any oil in this line may mean the pcv needs changing, which means I need to go do that.

 

Thanks for the information. That should be very helpful in finding a part for a long term repair.

 

My temporary repair is still working fine but I think I have found a good long term solution to this PCV elbow problem. I found a 16 mm (5/8") internal diameter reinforced silicone elbow at a racing supply company. I had to cut the length of it to fit properly but now it fits perfectly. Silicone stands up to heat and many other things under the hood much better than other types of rubber. It is not good for fuel nor is it recommended for oil pressure lines but I think it will do well for this application, especially since it is reinforced with three plies some type of fiber. Only time will tell.

It was not cheap but was still less expensive than buying the part from Ford. It was $17 plus shipping.

 

Thanks for the update. These kinds of posts sure help us DIY'ers. Can't count how many times over the years I've had problems, did searches, & fixed the problem w/o ever needing to post/ask about it.

Regards,
Rich