Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Ford Inline Six, 200, 250, 4.9L / 300
Sign in using an external account
Register Forgot Password?

LinkBack Thread Tools Search this Thread
Old 03-29-2011, 06:04 PM
krazeyelf's Avatar
krazeyelf krazeyelf is offline
Senior User
Join Date: Nov 2010
Location: Air Capitol, KS
Posts: 146
krazeyelf is starting off with a positive reputation.
Buzzing PCV Valve

Hello again folks! I have a rather puzzling issue going on here with my '81 F100 300/6. I've had this noise I thought was a vacuum leak from under the dash or engine compartment, or worse yet, some type of bearing going out. A couple weekends ago, I was investigating and I saw a cracked vacuum hose leading from the PCV valve to the carb/manifold area. The top hole in the PCV valve had already been plugged by my mechanic. I decided to change the vacuum hose and PCV valve, and I plugged the top PCV hole like the old valve was. Now the noise is laouder. I finally tracked it down today and it's the new PCV valve, which is buzzing/rattling loudly, even when I pull the valve out of the valve cover. Anyone out there hear of this happening, and does it mean anything?

Beastie: 1981 F100 Ranger XLT Flareside, rebuilt Big Six, 4spd, daily driver, family heirloom
Reply With Quote
Old 03-29-2011, 07:20 PM
planehunter's Avatar
planehunter planehunter is offline
Elder User
Join Date: Aug 2010
Location: Vancouver, WA
Posts: 547
planehunter has a good reputation on FTE.planehunter has a good reputation on FTE.
Sounds like something is hooked up wrong. The PCV vents the engine to the intake (basically). Take a piece of paper napkin and lay a corner of it over the hole in the valve cover and do the same thing to the PCV after it is out of the valve cover but the vacuum hoses are still connected. All of this is while the motor is running. While the paper is over the vent on the valve cover, it should be blowing up gently, more as you rev the motor. The PCV should hold the paper to it with mild suction, more as you rev it up. You should also get a vacuum diagram and check all the hose routings.
Reply With Quote
Old 03-29-2011, 07:20 PM

Similar Threads
Thread Thread Starter Forum Replies Last Post
sluggish acceleration in 4.6 Aviator 78_79ford Explorer, Sport Trac, Mountaineer & Aviator 28 01-28-2015 07:29 AM
Underhood buzzing noise - PCV? PMDRACER Modular V10 (6.8l) 0 10-20-2011 02:09 AM
PCV valve Conanski 1987 - 1996 F150 & Larger F-Series Trucks 11 06-12-2009 12:04 AM
PCV Location on early 60s Y block... deyomatic 1961 - 1966 F-100 & Larger F-Series Trucks 4 12-17-2008 08:52 PM
'97 f150 pcv valve buzzing loudly pbjames1 1997 - 2003 F150 7 12-27-2006 05:52 PM

Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Ford Inline Six, 200, 250, 4.9L / 300

bronco, buzz, buzzes, buzzing, buzzingpcvvalve, change, f150buzzingvalvevalvecover, f250, ford, humming, noise, pcv, sound, v10, valve

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump

Participate In The Forums

Create new posts and participate in discussions. It's free!

Sign Up »

All times are GMT -5. The time now is 02:49 PM.

Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
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. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup