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High Pitched Noise From Engine

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Jul 21, 2006 | 12:17 PM

#1

RangerPilot

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From: Durant, OK (SOSU)

High Pitched Noise From Engine

I've noticed when we first get our trucks out, especially on cold days, they make a higher pitched noise it seems, consistent with engine RPM. Anybody wanna enligten me on why that is?

RP
Zach

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Jul 21, 2006 | 04:56 PM

#2

BigF350

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From: Melbourne, Aus

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I am guessing it is the fan who's viscous clutch hasn't warmed up...

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Jul 21, 2006 | 07:11 PM

#3

RangerPilot

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From: Durant, OK (SOSU)

Ahh good thinkin', never thought of that. Thanks BigF350!

RP
Zach

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Jul 21, 2006 | 07:46 PM

#4

Bob Ayers

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From: Durham, NC

It also could be increased air flow through the IAC valve, which raises the idle on a cold start.

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Jul 21, 2006 | 07:50 PM

#5

CowboyBilly9Mile

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From: Eastern WA

Alternator recharging the battery. Easy enough to verify too.

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Jul 24, 2006 | 05:00 PM

#6

john112deere

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From: Maine

I doubt it gets cold enough in Texas, but it IS a Ford- my power steering makes a bit more noise right after a cold start. (Not that I don't hear what the other's have mentioned as well.)

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