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High Pitched Noise

This is a discussion on High Pitched Noise within the General Help forums, part of the LSx Technical Help Section category; My car is making a high pitched noise well after start up. It makes the noise when it first starts ...

  1. #1
    Junior Member McCool318's Avatar
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    1998, A4, T-TOP, Trans Am

    High Pitched Noise

    My car is making a high pitched noise well after start up. It makes the noise when it first starts up but then shuts off. 5-10 minutes down the street I hear it make the same high pitched noise and my lights dim down or almost shut off then it kicks off again a few seconds later. Anyone know what cause this? Any helped appreciated.

  2. #2
    Member SilverSteen25's Avatar
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    Sounds like ur alternator is going bad

  3. #3
    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Air pump??

  4. #4
    Junior Member McCool318's Avatar
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    I will try and get a sound clip of it today and post it up in the afternoon. Cause it makes the noise on start up for a few seconds and goes away. It has always made the noise as long as my mom owned the car. It used to only do it on cold start ups. I haven't driven the car for a long distance and then got and cut it off then started it up later and drive it again. I just use the TA to get back and fourth to work right now. It is only a 4 mile drive one way then it sits for 9 hours and then drive it back home and stays parked all day while I sleep.

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    Member SilverSteen25's Avatar
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    Is it making a whining sound or like a high pitched sound?....The air pump does make a high pitched sound when u first start ur car, and then it goes away, but I can't see it making ur lights go real dim

  6. #6
    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    It makes mine dimmer. Not really dim. and when you rev mine kicks off and then kicks on again randomly. I say this is the noise since its a 98. Its loud enough to make people think that i have a maggie under the hood.

  7. #7
    I have a need for speed! jigger1166's Avatar
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    It sounds like the A.I.R. pump. It's inside the L/F fender, in front of the wheel. It's normal.

  8. #8
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    its probably your alternator, Mine squeals like a SC sometimes.

  9. #9
    LS1 Wizard 00BadBrd's Avatar
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    Check your vac lines going to your throttle body if there collapsed or have a hole/dry rotted it will make a high pitch noise and that would lower your RPM's down enough to causing the alternator not to produce enough amps .... making your lights dim

  10. #10
    I have a need for speed! jigger1166's Avatar
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    Quote Originally Posted by 00BadBrd View Post
    Check your vac lines going to your throttle body if there collapsed or have a hole/dry rotted it will make a high pitch noise and that would lower your RPM's down enough to causing the alternator not to produce enough amps .... making your lights dim
    It would also set the S.E.S. light. So, I don't think that's the prob.

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