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Dan
Dan, Auto Technician
Category: Chevy
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Experience:  GM Mark of Excellence/ Service Guild Participant with 13 years experience, ASE Master Certified
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Why does car make a s whirring noise when gas is applied

Customer Question

My 2004 Grand Prix GT2 began making a strange noise which I would describe as a whirring sound when I step on the gas. I decided to see if I couyld hear it when I was in park. I have now found that the engine will not rev above 3500 RPM and will sit at that with the gas pedal to the mat. Any idea''s? Could it just be a sensor?
Submitted: 6 years ago.
Category: Chevy
Expert:  GMTechBernard replied 6 years ago.

The whirring noise could be idler pulley/tensioner pulley/water pump pulley or maybe the power steering fluid is low. I would remove the belt and start it up, see if the noise is gone. If so, then its a belt driven issue (pulley, pump, etc...) If not, it could be the transmission.

As for it not revving up past 3500, its designed to do that. If the trans is in Park or Neutral, the Powertrain Control Module limits RPMs to 3500. As long as it goes past 3500 while in gear, your OK.

Customer: replied 6 years ago.
Reply to GMTechBernard's Post: I went out and checked on the rom issue after I posted the question as I thought this might be the case with the newer vehicle (88 lesabre would did not have this feature. You're right because it did rev gast the 35 when moving. The whirring is an intermittent thing, however, it is occuring more and more. Seems to disappear if I shift into 2nd.
Should also mention that I have checked all fluid levels and they are OK. Also, the sound is not present when engine is in part or neutral.
Expert:  GMTechBernard replied 6 years ago.
Are you sure you checked the power steering? I ask because the Power Steering resevior is very difficult to get to. You need to look at the dipstick thats attached to the cap (not trying to insult you, but power steering noises are very common on these cars due to low fluid).
Customer: replied 6 years ago.
Reply to GMTechBernard's Post: I have checked all the fluids and they are all ok. Sound is inly present when gas is applied when moving. Nothing when just turning without applying gas.
Expert:  GMTechBernard replied 6 years ago.

So the noise goes away in second gear? Does it come back in 3rd or 4th? Will it do it in first gear if you let off the gas or only while accelerating?

Customer: replied 6 years ago.
Reply to GMTechBernard's Post: Only when gas is being applied and it is present in all gears just not as noticible in 2nd.
Expert:  GMTechBernard replied 6 years ago.

I'm sorry. I work on these things all day, and my mind has drawn a blank. Diagnosing noises over the internet is very difficult! I'm going to opt out, and if another expert has any suggestions, they will chime in.

Good luck, I hope you find a resolution!

Customer: replied 6 years ago.
As stated the noise is only present when gas is applied and at no other time. I had thought it might be a belt or bearing but was hoping someone might narrow it down. I am leaing more towards the bearing as it now occurs to me since it is becoming more pronounced that it begins after the car has been running for a bit and the temperature rises.
Expert:  Dan replied 6 years ago.
Hi there, can you put the e-brake on and put the car in drive while pushing the brake pedal to stop the car and rev the engine while listening for the noise (use a long screwdriver pressed against your ear)? Put it against the alternator, water pump, top of transmission, etc. See if you can pinpoint the noise. All of the afore mentioned can make a whining/whirring sound along with the power steering pump like Bernard was talking about.

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Dan
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GM Mark of Excellence/ Service Guild Participant with 13 years experience, ASE Master Certified