Thread: Whistling sound coming out of valve cover oil cap.

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  1. #1 Whistling sound coming out of valve cover oil cap. 
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    I re did all the vac lines and tees in my recent post i had made, because I had a bad vac leak. So what happens now is when the car is running for more than 5 mins a loud whistling sound is coming from the oil fill cap, I removed the oil cap and the noise went away. I put my hand over the hole and there is a lot of suction. What the heck would cause this? TIA
    1.9 Rockers- 42.5 injectors- 3.4" mps- Wizaired 104s- 180*- PRJ 10mm wires- SD headers 3" DP- Hp tuner- Dynotech stage 2- 3.29s 1'' chain
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  2. #2 Re: Whistling sound coming out of valve cover oil cap. 
    GTP Level Member QwikGT's Avatar
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    that thrasher tb spacer is blocking the pcv. put a breather on instead of the oil fill cap
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  3. #3 Re: Whistling sound coming out of valve cover oil cap. 
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    I did replace the tb gasket yesterday. Is there a way i put it on backwards. Im gonna check tonight.
    1.9 Rockers- 42.5 injectors- 3.4" mps- Wizaired 104s- 180*- PRJ 10mm wires- SD headers 3" DP- Hp tuner- Dynotech stage 2- 3.29s 1'' chain
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  4. #4 Re: Whistling sound coming out of valve cover oil cap. 
    GTX Level Member Rather B Blown's Avatar
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    Quote Originally Posted by QwikGT View Post
    that thrasher tb spacer is blocking the pcv. put a breather on instead of the oil fill cap
    this...its crankcase pressure put a breather on problem solved it has nothing to do with your tb gasket
    Quote Originally Posted by Reptile
    It sounds like you accidentally stuffed a midget in the downpipe, and he's hammering out an SOS to get out.
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  5. #5 Re: Whistling sound coming out of valve cover oil cap. 
    DUI BABY Bio248's Avatar
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    take the throttle body spacer off and tap your throttle body or blower case instead. this will solve your problem without creating another one with a breather.
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  6. #6 Re: Whistling sound coming out of valve cover oil cap. 
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    Haha it was the TB gasket. I put it in backwards on the other side of the spacer facing the SC inlet for some reason. Turned it around problem gone. I hope i didnt ruin anything with this stupid misshap. Sorry to post it twice. Thanks again for the fast replies.
    1.9 Rockers- 42.5 injectors- 3.4" mps- Wizaired 104s- 180*- PRJ 10mm wires- SD headers 3" DP- Hp tuner- Dynotech stage 2- 3.29s 1'' chain
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  7. #7 Re: Whistling sound coming out of valve cover oil cap. 
    GTP Level Member 01gpgt01's Avatar
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    you didnt do any damage. Glad you got it fixed
    2001 GT. A few here and there mods http://www.streetfire.net/video/2001...ynp_208097.htm

    2009 Hummer H3 Solar flare premium
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  8. #8 Re: Whistling sound coming out of valve cover oil cap. 
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    Ha ok. Thanks man.
    1.9 Rockers- 42.5 injectors- 3.4" mps- Wizaired 104s- 180*- PRJ 10mm wires- SD headers 3" DP- Hp tuner- Dynotech stage 2- 3.29s 1'' chain
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