Buzz under hood
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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
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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.
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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?
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Hotshot
Joined: Jan 2011
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From: Puget Sound
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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.
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