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Old 06-29-2009, 19:48   #1 (permalink)
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'94 Grand Marquis sometimes has high idle/howling sound

I tried searching but the keywords are way too common to get any results.. Anyway, ever hour or so of driving the car will have a "moment." It will run on a fast idle out of nowhere and at the same time makes a howling sound. I remember a couple years ago trying to trace it down and it sounded like it was coming from the airbox area. A simple tap of the accelerator will clear it up, the idle will instantly drop back down to a normal idle speed and the howling goes away.

Any idea on what would cause that?
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Old 06-29-2009, 21:12   #2 (permalink)
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Re: '94 Grand Marquis sometimes has high idle/howling sound

Possibly the ICS.
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Old 06-30-2009, 09:00   #3 (permalink)
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Re: '94 Grand Marquis sometimes has high idle/howling sound

I called NAPA just now to get the price of a new ICS and the guy quoted me $106.00. How would I go about testing it to see if it is the culprit?
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Old 07-05-2009, 09:49   #4 (permalink)
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Re: '94 Grand Marquis sometimes has high idle/howling sound

Advance sells Ford IACs in Wells boxes at ~1/2 Ford's price. Look for the Ford PN pin-printed in the aluminum. Does your IAC hose have a resonator?

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