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Old 10-19-2011, 09:51 PM   #1
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humming noise during idle

my stang is been making these kind off like a humming noise during idle from the front left last year it did it on the rigth front , when it starts doing it the idle drops by like 100 from 800rpm to 700 , i give it alittle gas and it gouse away but starts again sometimes , does any body had these problem before? 2001 bullitt
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Old 10-20-2011, 03:16 AM   #2
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Do you know if your car has the "copper cap mod" done to it?
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Old 10-20-2011, 04:44 AM   #3
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what do you mean,
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Old 10-20-2011, 07:22 AM   #4
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Could be power steering pump pulley bearings going bad. Or one of your idle pulleys going out.
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Old 10-20-2011, 11:27 AM   #5
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but is a big humming noise am starting to suspec that maybe the oil pump but like i say it use to be on the rigth side now on the left side is the noise,ill try to put a video on youtuve today
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Old 10-20-2011, 06:03 PM   #6
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The copper cap mod is when when you stick a copper cap with a 1/4 inch hole drilled in it in the IAC hose so the car won't stay idling high while coasting in neutral. I had this done but then I took it out cuz it would randomly hum like you said only while idling and would go away once I revved the engine.
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Old 10-23-2011, 03:12 AM   #7
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i think yeah is my powersteerinng pump or someting to do whit the hose leaking tru the treath of the low pressure powersteering house(dam autozone parts)
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