Buzzing Noise w/ Ignition Switch - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 05-20-2007, 05:31 PM Thread Starter
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Buzzing Noise w/ Ignition Switch

When I initially turn my ignition switch to allow the glow plugs to warm it makes a short buzzing noise. Once the switch is turned to the start position the trucks starts fine and I haven't experienced any problems. The battery posts and cables are all good. Is this the first sign that my ignition switch may be going bad or is there some kind of short somewhere. The switch does not make this buzzing noise all the time. Let me know what you think.
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Jake Greuey
99 F-250 PSD Auto Super Duty LWB Ext Cab 4WD
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post #2 of 13 Old 05-20-2007, 05:35 PM
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i do believe what you are hearing is the vacuum pump,located on the passenger fender,have someone else turn the key on while you listen and i think you will see and hear.
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post #3 of 13 Old 05-20-2007, 05:56 PM Thread Starter
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If it is the vacuum pump should I be concerned. I have never heard this buzzing noise before and it just started less than a month ago after I had unhooked all the battery cables and cleaned all the posts.

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post #4 of 13 Old 05-21-2007, 02:36 AM
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mine has been making that noise for years,when you don't hear it anymore is when you should be concerned
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post #5 of 13 Old 05-21-2007, 02:43 AM
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normal, i have the same buzzing noise too. has done it since i bought it almost 3 years ago.

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post #6 of 13 Old 05-21-2007, 04:56 AM
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I've got the same noise on my '07. I just thought it was the glow plug heat cycle, but it sounds a lot like an electric pump also.

Anyway, I hear it on mine, too

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post #7 of 13 Old 05-21-2007, 05:15 PM
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my truck done this and it proved to be a low battery , the noise was a relay quivering from not enough voltage

just call me Ashley!

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post #8 of 13 Old 05-21-2007, 05:24 PM Thread Starter
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We purchased two new batteries a few years ago and I haven't experienced any hard starts. I guess since several people have experienced this sound and the engine turnover is good I will just keep an eye on the battery voltage or any drastic dimming of the dome light when I go to start it. The sound does not occur at every start either.
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post #9 of 13 Old 05-21-2007, 05:26 PM
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mine will do it too .. if the keys on it does it like while im changing tunes with the flashpaq, it dont stop unless I turn the key off or start the truck

1999 F250 XLT 2WD 7.3, 6 spd, South Bend Con OFE, Detroit Truetrac, Tony Wildman tunes, Autometer Boost&Pyro, AFE Stage II, 4" MBRP Exhaust, 2" Daystars, 17x9 DC1 wheels wrapped in 33x12.50 MTZ's

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post #10 of 13 Old 05-21-2007, 05:31 PM
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it doen't take a big voltage drop to cause the relay to buzz. I had a small shot in my overhead console and it would drain the bats down enough to cause the buzz but the engine would still start. this would only happen after the truck had been sitting for awhile, like 4 or more hours

just call me Ashley!

2000 F-250 SC Lariat Destroked CR 5.9 Cummins 1-14-09

2006 F350 CC 6.0 4" exaust, DP tuned and to chicken to go any further

2004 Explorer V8 limited "all black"

1990 7-UP mustang 5.0 LX 25th annivesary

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