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#1
07-21-2010, 08:54 AM
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Loud, high pitched whistle
have a 97 town car, upon start up there is a loud, high pitched whistle/hum(not sure how to describe it) type noise comming from the engine. Possibly a pulley?? it doesnt sound anything like a serp belt its much louder and a different sound. I cant pinpoint where it is comming from. It does sound like the front of the motor. Any body have any ideas? Any input would be appreaciated thank you
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#2
07-21-2010, 09:14 AM
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Re: Loud, high pitched whistle
Open the filter airbox. Is the noise coming from there? If so, you need to replace your Idle Air Control (IAC) Valve.
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 2000 Mercury Grand Marquis LS - 119k / 14.89s @ 92.11MPH [ pictures | videos ] > Dual Flowmaster Delta 40s / J-Mod / PI Intake Manifold & Cams / Marauder Air Box & 80mm MAF / 3.55 Trac-Lok > Bumper Tuck / Steeda UD Pulleys / CVPI Zip Tube / Ported & Polished Plenum / BBK 70mm TB > BOC 93 Octane Tune / Headlight Relay Upgrade / 17mm rear stabilizer bar / Heinous Aluminum Billet Rear Control Arms > CVPI aluminum driveshaft
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#3
07-21-2010, 11:51 AM
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Re: Loud, high pitched whistle
If the noise is RPM related, then I'd have to guess a Power Steering Pump Pulley as the noise you describe is exactly that of a Jeep GC I owned.
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2004 Signature Series, 223k, Current Client Getter 2002 BMW 325Ci Convertible, 132k, Current Grocery Getter 2008 Toyota Tacoma TRD, 82k, Current Hauler 1996 Cartier, 173k, Traded in For The 2004 Signature 1990 Signature, 157k (sold) 1990 Signature 6-Passenger Limousine, 87k (sold)
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#4
07-21-2010, 07:35 PM
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Re: Loud, high pitched whistle
You have the same issue as me. Check your fuel pressure regulator. That was my issue. That sound is annoying.
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#5
07-21-2010, 11:22 PM
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Re: Loud, high pitched whistle
Mine was the plastic tube that goes from the back of the engine to the IAC. but I have a older engine design than yours. If you raise the idle up in PARK, dies it go away?
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Nick names for my Car.... Abe Lincoln,  opcorn:The President,  Lucky Number 5 
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#6
07-21-2010, 11:49 PM
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Re: Loud, high pitched whistle
hey guys thanks for all the tips so far. It doesn't go away as I raise the rpms. It seems to get a little worsebut its hit and miss while I raise the rpms
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#7
07-22-2010, 01:49 PM
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Re: Loud, high pitched whistle
Attached you will find the fuel pressure regulator. Try that and see if that is what the noise is. That was my problem.
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