Mass Airflow Sensor humm?

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Sep 3, 2005 | 08:28 PM

newfordy

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Tuned

Joined: Apr 2001

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From: Central Callifornia

Mass Airflow Sensor humm?

Anyone ever hear of MAS making a humming noise? Happens on warmer days 95+, intermittent problem making it hard to diagnose. 98Ranger/4.0L belongs to relative in Southern California(250 miles from me). ANY help or insite is appreciated

Sep 3, 2005 | 08:53 PM

88red

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From: maryland

I would suspect a noisy IAC valve. I have never heard of a noisy MAF. I guess anything is ossible though. M 97 is humming in hot weather also and I suspect the IAC, but I am not sure.

Sep 4, 2005 | 01:16 AM

newfordy

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Tuned

Joined: Apr 2001

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From: Central Callifornia

IAC? Intake Air Control? Relative mentioned something on the engine side of the intake tube that looks like a motor, could it be? Thanks for the reply Red.

Sep 4, 2005 | 01:35 AM

CowboyBilly9Mile

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From: Eastern WA

IAC's have been known to hum and/or make a sound similar to a foghorn on some 4.0's. They are located on the upper intake manifold behind the butterfly valve.

Sep 4, 2005 | 08:31 AM

GeneB_45

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Joined: Aug 2005

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My IAC caused this fog horn sound like a huge vacumn cleaner.
I replaced mine with Borg Warner part number 22972 from Pep Boys for $60 + tax.
Cured the problem.

Oh, I am driving a Ranger, '98, 4.o.

/Gene

Sep 4, 2005 | 07:54 PM

88red

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From: maryland

The IAC actually stands for Idle Air Control. It regulates air flow at idle to compensate for cold starts or extra load of power steering pump, a/c, or transmission in drive or park. Sometimes they go bad and the engine stalls or races at idle. Other times they go bad and still function normally, but make humming noises.