Weird buzzing noise upon cold start... - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 01-14-2013, 03:23 PM Thread Starter
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Weird buzzing noise upon cold start...

My truck has a erratic, buzzing sound coming from the front, passenger side area of the engine bay. It is louder when the truck is first started and is cold. The last few days its been 3-6 degrees below zero out and the truck has the "buzzing" noise which is pretty loud.

It disappears when the truck is up to operating temps and it is not there during the summer when it's warm.

The noise is coming from the area of the belts between the engine and the fan. I have a video of the noise so I'll try and figure out how to upload it.

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2008 Ford F-350
6.4L Power Stroke
Crew Cab Long Bed
Buck Stop Bumper w/
WARN 9500 lbs. Winch
H&S Mini Maxx w/ homemade mount
5" Flo-Pro DPB exhaust w/ muffler
Bilstein 5100s Shocks
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post #2 of 14 Old 01-15-2013, 04:32 AM Thread Starter
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Here's a link to my video


2008 Ford F-350
6.4L Power Stroke
Crew Cab Long Bed
Buck Stop Bumper w/
WARN 9500 lbs. Winch
H&S Mini Maxx w/ homemade mount
5" Flo-Pro DPB exhaust w/ muffler
Bilstein 5100s Shocks
AFe Stage II Magnum Force Intake
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post #3 of 14 Old 01-15-2013, 08:47 AM Thread Starter
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Ok, so I looked into the engine bay today and saw what I think is the accessory pulley just below the alternator bouncing around as the truck was running.

Are any of the pullies suppose to move at all?

2008 Ford F-350
6.4L Power Stroke
Crew Cab Long Bed
Buck Stop Bumper w/
WARN 9500 lbs. Winch
H&S Mini Maxx w/ homemade mount
5" Flo-Pro DPB exhaust w/ muffler
Bilstein 5100s Shocks
AFe Stage II Magnum Force Intake
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post #4 of 14 Old 01-15-2013, 08:58 AM
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No, they aren't supposed to move.


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post #5 of 14 Old 01-15-2013, 09:56 AM
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Are you talking about the idler pulley?

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #6 of 14 Old 01-15-2013, 12:05 PM Thread Starter
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Yes, I think so. I watched it this morning literally bounce as the belt moved over it.... I don't think it's supposed to do that.

After work I'll take another video of the pulley and post it. Sounds like the "buzzing" noise is coming from the same area.

2008 Ford F-350
6.4L Power Stroke
Crew Cab Long Bed
Buck Stop Bumper w/
WARN 9500 lbs. Winch
H&S Mini Maxx w/ homemade mount
5" Flo-Pro DPB exhaust w/ muffler
Bilstein 5100s Shocks
AFe Stage II Magnum Force Intake
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post #7 of 14 Old 01-15-2013, 12:08 PM
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No the idler pulley is not supposed to bounce. That is likely your problem.

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #8 of 14 Old 01-15-2013, 12:18 PM
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I'd be willing to bet that's your problem


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post #9 of 14 Old 01-15-2013, 12:29 PM Thread Starter
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Ok thanks guys!!!

2008 Ford F-350
6.4L Power Stroke
Crew Cab Long Bed
Buck Stop Bumper w/
WARN 9500 lbs. Winch
H&S Mini Maxx w/ homemade mount
5" Flo-Pro DPB exhaust w/ muffler
Bilstein 5100s Shocks
AFe Stage II Magnum Force Intake
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post #10 of 14 Old 01-15-2013, 04:04 PM Thread Starter
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Ok here' what's bouncing while the truck is running. The diagram I found said its the accessory pulley. #8.

Also here's a video of the pulley bouncing, it's hard to see but you can see it slightly bounce with the light on it.

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2008 Ford F-350
6.4L Power Stroke
Crew Cab Long Bed
Buck Stop Bumper w/
WARN 9500 lbs. Winch
H&S Mini Maxx w/ homemade mount
5" Flo-Pro DPB exhaust w/ muffler
Bilstein 5100s Shocks
AFe Stage II Magnum Force Intake

Last edited by NVHunter83; 01-15-2013 at 04:08 PM.
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