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I get a high pitched whistling sound when I first start the engine every day and after it has been parked for several hours, which lasts several minutes. It doesn't vary much w/RPM or car speed. Seems to be at passenger side front of engine. No obvious problems w/steering or charging. More noticeable since blazing hot TX heat started. Any thoughts are appreciated.
 

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My '95 4.6 was doing that from around 2015-2016. I couldn't find it, thought it was temperature related. Now that you mention it, I don't think I've heard that noise since I cleaned out the EGR tube back in January.
 

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Rubber hose to ear or stethoscope(not sure don't own one) would help isolate the area.

High pitch, first thing to my mind is belts and pulleys and next is A/C compressor.
 

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Check your vacuum lines..Especially the one going to the PCV valve..

If there's a hole in one of those vacuum lines, they can make a whistling sound..







Rayo..
 

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Discussion Starter #5
Rubber hose to ear or stethoscope(not sure don't own one) would help isolate the area.

High pitch, first thing to my mind is belts and pulleys and next is A/C compressor.
I sprayed some WD-40 on the serpentine and the sound stopped. It may be that (it's about 5-6 years old). What do you think?
 

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Could possibly be the EVAP valve system, that usually operates on engine start up, could be the valve is obstructed in a way that causes it to whistle lol?
 

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Idler pulley. Try replacing the idler pulley or the belt tensioner that MCM51 mentioned. You'll probably also want to replace the belt.

If you can't trace it to a vacuum leak look at the pulleys.





#1 is the Idler pulley
#2 is the alternator
#3 is the other Idler shown on the right above
#4 is the Power Steering pump
#5 is the water pump
#6 is the crank
#7 is the tensioner pulley
#8 is the AC compressor
 

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I sprayed some WD-40 on the serpentine and the sound stopped. It may be that (it's about 5-6 years old). What do you think?
WD40 is a solvent and NOT a lubricant.. and won't be doing anything rubber any favors.
You should spray silicone instead.
-g
 
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