ajtemple

I spent all evening browsing the internet looking for the PCVvalve on my F150. Most say it is on the passenger rear of the manifold intake,but all I've found is a medium size vacuum hose, with two smaller hosesconnected into the larger one. It's WAY in the back next to the firewall,almost impossible to get to, is this it? I'm getting codes 0171 and 0174, andthe guy at OReilly's Auto Parts said he would sell me the O2 sensors ($200),but the problem is most likely a vacuum leak at the 90 degree rubber hosecoming from the manifold at this point. He said might as well replace the PCVvalve while I'm in there. Is this the valve way back there? This hose is verysoft and squishy at the turn.

Sorry engine is so dirty, went through huge mud pit deer hunting a few weeksago

Kevin8629

The pcv valve should be located on your valve cover just behind the oil filler according to the service manual


The heated pvc is bcck in the area your talking about, I don't know anything about that but heres the pic from the service manual

4.2

Those books are so misleading I swear...
Here ya go bud!
http://www.ford-trucks.com/forums/12...-pictures.html

Jmcanter

Thank you!!!! I looked for over an hour and couldnt find it!

ajtemple

Thanks Kevin and 4.2! The pictures 4.2 provided are great, but on my 2000 4.2L, the PCV is in the back passenger side of manifold, a little different from the pictures 4.2 provided.

Kevin's drawings are exactly what mine looked like, but the PCV valve is NOT where the 3-nipple connector goes into the manifold, but if you follow the center hose out of that connector down (about 6 inches) it will take you to a plastic Y-connector. This is one of the "top" arms of Y-connector. The other "top" arm of of Y-connector has a 2" hose that connects directly to L-shaped (90 degree) black plastic PCV valve. I replaced mine with a metal one. I don't know where the downside ("body" or whatever) of the Y-connector goes, somewhere under manifold, couldn't follow it.

I was getting 0171 and 0174, front and rear O2 sensors, but the guy at OReillys told me to try the black hose by the pcv (6" center hose) first as it causes the same codes. The hose in question was very soft, squishy and had lots of small cracks in it. Well, after many knuckle scratches reaching way back there, and having to cut the hose off the manifold with a razor blade, I got a new pcv valve and 9" of generic 3/8" hose installed, cleared my codes, and 30 miles later still have no engine light! Still holding my breath, but a few more days and I'll be smiling bigger and breathing easier. Thanks for the help and I hope this post helps someone down the road!

tap4154

I know this is an old thread, but THANKS! I've replaced the PCV elbow under the throttle body several times but was unaware of the hose on the back of the manifold. Had another P0171 and couldn't find a leak anywhere until I found this thread, then reached back and felt the mushy hose and felt suction.

Put some thin plywood on the engine, climbed on it and got the hose off fairly easy, then put some 3/8" fuel line in it's place. Later on I stopped at O'Reilly and got a generic J-shaped PCV line (Dorman 46039CD) and plan to put it in eventually, because the fuel line I used wants to kink, even though I made a large loop. But in the mean time, it's working.

Here's the old tube:

aimaffordtruckmain

Registered this account to resurrect this 3 year old post.

Thanks to you guys I made my mechanic look like a dummy with a $2 length of 3/8 fuel line.

Cheers.

tap4154

Just got notification of your post. Yes, these truck and auto forums are GREAT for solving mechanical problems, but I no longer have my 2000 Ford V6. It had over 300K miles, and still running, but I think a valve guide was leaking, and the tranny was beginning to go south, so I sold it as a fixer-upper in otherwise great shape, and got a new 2018 Ram V6 Tradesman a few years ago. Very happy with it, but the old Ford F-150 V6 was a great truck!

aimaffordtruckmain

I'm a shade tree mechanic by necessity, money is tight and my vehicles demand more... but it has become a very zen, joyful experience fixing up these things other people thought were dead or dying, saving money and greater yet, learning about these machines. A wise man once said new does not mean best; old does not mean dead

300k is amazing, congrats! Both my vehicles are coming up on the 200k club, and hopefully lot of life left in my '99 f150 at 185k then. It's actually my very first truck, coming from driving and maintaining sedans. This community is pretty sweet too, it's nice to feel welcomed.
I think rams are fantastic and very attractive trucks! But unfortunately for my cheap *** they hold their value a lot more than this cute lil' jellybeans, ahaha

Have a good one!

tap4154

You should get many more miles out of that '99, but one thing to keep an eye on is the transmission dip stick. I put 3 in. For some reason they'd come loose and begin leaking. The first time I didn't notice until it had caused contamination of the fluid, and I ended up needing a new tranny at 145K miles. I caught it the other 2 times and replaced it myself. Just keep an eye out for fluid spots under the passenger-side door.

Really did no major work to the engine, but one other issue that could cost a lot at a mechanic is the intake manifold runner linkage, which is at the back of the manifold near the firewall. Has small nylon bushings that can break and the linkage rods fall out, causing "intake manifold runner stuck" codes and poor running. Ford mechanic wanted to remove the manifold etc to replace the $6 bushings ($600 minimum), but I got it done myself without removing the manifold. NOT easy, but it can be done.

In fact here's a thread on it. A common problem with that V6.

https://www.f150online.com/forums/v6...tuck-open.html

BTW, that Ram 305 HP Pentastar V6 with an 8 speed ZF transmission is one heck of a powertrain. Great mileage and peppy! I have nothing bad to say about the old 2000 Ford though. In fact I hated to see it go Just didn't like the new Fords, so switched to Ram.