Whirring noise at 30MPH - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-15-2004, 01:14 AM   #1
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Default Whirring noise at 30MPH

I just got new front struts and front tires today. I got a 4-wheel alignment and also had the front left bearing replaced. (They soaked me for $350 for the bearing but the car needed it and I didn't have time to try doing it myself.) The ride is MUCH quieter now.

I have noticed a new noise now - perhaps because the rest of the ride is so quiet. I think it is coming from the front right but I can't be totally sure.

-It is not noticeable unless you listen very carefully with the windows shut.
-It is a "whirring" noise at a constant frequency
-It only happens at 30MPH
-The volume increases slightly when I step on the gas, but it'* still there if I let up off the gas
-If I shift into neutral and coast at 30MPH, the noise goes away

Any ideas?
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Old 07-15-2004, 01:30 AM   #2
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Is it like a whine? It might be alternator bearings.
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Old 07-15-2004, 01:47 AM   #3
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If the whine is dependant on vehicle speed it has to be something from the torque converter back.

Check your transmission fluid level and tire pressures.
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Old 07-15-2004, 03:56 AM   #4
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Correction - the sound DOES go away if I let up off the gas.

A few more updates:

-I wouldn't say it'* a whining sound. It'* a whirring like the kind of sound you'd expect to hear from the drivebelt. It has a slight rattle to it. I had a water pump bearing go bad once and it sounds like that.

-It ONLY happens between 25MPH and 30MPH, and is most noticeable at 30MPH.

-At 30MPH if I shift into neutral and step on the gas, I do NOT hear the sound.

-It is definitely coming from the front of the car

-Tranny fluid is pink and at the correct level. It was changed 6 months ago.

-Tire pressure is 32 PSI in all tires.
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Old 07-15-2004, 06:52 AM   #5
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Ahh, check the deflection of your idler.
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Old 07-15-2004, 10:35 AM   #6
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Thanks, I will check the idler.
Jeremy
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Old 07-15-2004, 04:52 PM   #7
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I'm going to take a guess that it'* your fuel pump. My 95 made this noise all the time under the exact conditions you explain. I don't think there'* anything wrong with it.
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Old 07-15-2004, 06:39 PM   #8
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My car makes a whirring noise under 20-30 mph when it'* been on for a while. I dunno if it'* the fuel pump, i thought it was further forward then that.
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Old 07-15-2004, 10:00 PM   #9
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sound like tranny whine...mine does the same thing around that speed....there is a computer update to correct this problem....i found out about it on a computer re-flash website....i guess its caused by excessive tranny pump fluid pressure at that speed....
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