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post #1 of 20 (permalink) Old 11-07-2010, 12:17 AM Thread Starter
Join Date: Sep 2009
Location: Brampton, Ontario
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engine noise

I have an 06 F150 5.4 xlt super crew. It started making a noise again as soon as the temps dropped below 0.
It makes a high pitched wistling sound at around 2000 rpm, if I give it a bit of gas or let up it goes away but keeps coming back.
I had a mechanic look at it last winter but he was at a loss as to what was causing it. All the guages show that temps and oil pressure are where they should be.
It is definitely coming from under the hood, I am hoping some else has experienced the same thing and can point me in the right direction.

Thank you.
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post #2 of 20 (permalink) Old 11-07-2010, 12:26 AM
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Belt, alternator, bad weather stripping?

2013 f150 Ecobeast
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post #3 of 20 (permalink) Old 11-07-2010, 01:31 AM
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I had a noise from under the hood on my 04 5.4 in the colder days, never had it looked at, as it went away when the truck warmed up. to me just sounded like it was coming from the air box but who knows it didn't bother me so I left it alone.

2010 F150 Supercrew 4X4
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post #4 of 20 (permalink) Old 11-08-2010, 03:53 PM
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intake resonance common concern,check intake tube to make sure fully seated into filter box and check inlet in fender.

a moments silence for the shelbyx,i hope her new owner enjoys as much.
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post #5 of 20 (permalink) Old 11-09-2010, 05:32 PM
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One of the guys at work said he had a similar noise that turned out to be the belt tensioner. It's worth a look.

2007 F 150 FX4 and 2003 Outback 25FBS
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post #6 of 20 (permalink) Old 11-09-2010, 07:00 PM Thread Starter
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thanks folks. I will have a look at the tensioner and make sure the intake is fully seated into the fender and filter box.

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post #7 of 20 (permalink) Old 11-09-2010, 09:45 PM
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i have the same thing.. but i have a C.A.I and it still makes the noise.....if ur ford stops makin noise that ur usto hearing theirs a problem. i cant see it being the tensioner. kuz as long as this noise has been going on it would have fallen off buy now. I think its the harmonics of the cold air going past the throttle blade into a hot intake, because it is temp sensitive.

i think.

You tried your best and you failed miserably. The lesson is 'never try'. -Homer Simpson
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post #8 of 20 (permalink) Old 11-09-2010, 10:00 PM
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i got the same high pitched noise when it starts getting cold out.sounds like it coming from the tach or speedo to me.it will go away around ninety kms and if i let off the petal it comes back.you can play with the petal and make the sound go up or down.
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post #9 of 20 (permalink) Old 11-15-2010, 11:59 PM
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post #10 of 20 (permalink) Old 11-20-2010, 08:23 PM
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Ya, still don't have a fix for my truck.
Not looking forward to the whistle and whine this coming winter.

Sad that this issue is something consistent over assorted build years of Ford's best selling vehicle, but has NEVER been addressed.

SOLD - 2006 FX4 s/cab- ; MBRP exhaust, ARE tonneau cover, K&N CAI
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