Location of PCV elbow - (running lean) - F150online Forums

Go Back   F150online Forums > Powertrain & Mechanical > V8 Engines
Log In 

Location of PCV elbow - (running lean)

Thread Tools Search this Thread
Old 12-27-2007, 12:47 PM
Senior Member
Join Date: May 2004
Location: Sugar Land, TX
Vehicle: 2008 Ford F-250
Posts: 252
Location of PCV elbow - (running lean)

Hey everyone,

My truck (2001 F150 4.2) has been running lean (both banks) for a while now. However, after many rounds of troubleshooting, I've been unable to determine the cause.

The only symptoms are a slight decrease in mpg and an rpm loop effect during cold weather start up.


-cleaned MAF (two wires are still intact)
-cleaned IAC
-cleaned TB
-Removed Intake manifold to check for gasket leaks
-Replaced PCV valve and grommet around it.
-unable to find any leaks on the vacuum lines. (I might be missing 1 or 2, a diagram would be nice!)
-replaced fuel filter

I'm looking to sell this truck soon, and didn't really want to sink a whole lot of money into it, but would like to have this resolved.

After searching through numerous posts, I see many people have problems with the PCV elbow. Where is it on a 4.2. I know it's near the firewall on other engines, but after removing the intake manifold I couldn't find it.

Any suggestions or other ideas?

Reply With Quote
Old 12-27-2007, 07:19 PM
Senior Member
Join Date: Nov 2007
Location: California
Vehicle: 1999 Ford F150
Posts: 119
The elbow is located under the thothol body(SP). Also you mite want to look at the hose that is right past the pcv. It connects to the lower intake. The elbow is $15 at the dealer. The hose you can just use 3/8 bulk hose around a $1 at autozone. Goodluck Ben
Reply With Quote
Old 01-01-2008, 05:05 PM
Join Date: Jun 2004
Posts: 45
So the PCV is under the throttle body on the 4.2L. It has 2 lines coming off of it and the vent hose that leads to the rear pass. side valve cover where it seats into a rubber grommet. Mine seems to be loose there and doesn't seat very well. I too have been dealing with this air leak problem and the 171 and 174 codes. If you get the P2195 and 2197 could that really be the o2 sensors going bad. Says they are "stuck lean"
Reply With Quote
Old 01-25-2008, 01:56 PM
Senior Member
Join Date: May 2004
Location: Sugar Land, TX
Vehicle: 2008 Ford F-250
Posts: 252
Well I fixed my PCV issues!

I sold the '01 F150 and bought a '08 F250.
Reply With Quote


Similar Threads
Thread Thread Starter Forum Replies Last Post
Expedition Lost Coast - Sept 19-20 m3dragon West 2 10-22-2015 11:41 PM
2004 5.4 Air/Fuel mixture off??? silver fx4 5.4 2004 - 2008 F-150 3 08-05-2015 06:55 PM
2002 5.4L - 170,000 Miles - Tuneup list.. kev2126 1997 - 2003 F-150 9 07-25-2015 10:30 AM
Rough Idle while in gear, surging under heavy acceleration kolik 1997 - 2003 F-150 7 07-10-2015 10:04 PM
When to change fuel injectors rusty1971 1997 - 2003 F-150 18 07-09-2015 07:30 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off

All times are GMT -4. The time now is 03:33 PM.

This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Fordé is a registered trademark of the Ford Motor Company