Buzz under hood
Thread Starter
|
Joe28443
Joined: Jul 2009
Posts: 1,163
Likes: 4
From: Hampstead NC
Buzz under hood
I have a buzzing sound coming from the passenger side under the hood behind the battery. It does it when I turn the key (while the engine is off). Sounds like a compressor. Anybody have a clue?
Senior User
Joined: Mar 2005
Posts: 289
Likes: 0
From: Va. Beach, VA
Yup, vacume pump. When I first got mine years ago i ASSsumed it was from the glow plugs and learned later by observation up close and on here it's the pump. On a minute or two then off. If the key is left on for whatever reason for awhile like running the AE scanner, it will come back on at some point when the vacume pressure bleeds down some. Mine sounds more like clatter than a buzz.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
I have a Mity Vac with a vacuum gauge on it... it gets used almost every time I get near the truck. First... if your heater works at your feet, it's not a big leak. If all you have is defrost, it's a big leak. Pull a dedicated vacuum line (like to the front-right hub) and vac away, watching the gauge. No Mity Vac or funds to get one? You can try blocking one line at a time with the key on and listen for the change in pitch/shutoff with the pump.
Trending Topics
Thread Starter
|
Joe28443
Joined: Jul 2009
Posts: 1,163
Likes: 4
From: Hampstead NC
Would it have anything to so with the ABS light coming on? I recently installed the airlift 1000 airbags in front. ABS light started coming on and off after that. Is it possible a vaccum line come loose?
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Thread Starter
|
Joe28443
Joined: Jul 2009
Posts: 1,163
Likes: 4
From: Hampstead NC
I just went out and checked it, it's it doing it now. I do have heat coming out the floorboard so it must not be that big of a leak if any. Ian getting ready for a 1400 trip so I need to check it out again. Thanks guys
Laughing Gas
Joined: Feb 2004
Posts: 822
Likes: 9
From: Leander Texas
If the vac lines going down to your hubs are original my bet is you breathed on one too hard installing your airbags and developed a leak. At this age, most of them are brittle and pretty much worthless.
Thread
Thread Starter
Forum
Replies
Last Post