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Engine whistle at idle

moosey

By moosey
in 986 Series (Boxster, Boxster S)

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moosey Member

moosey

Posted
Posted (edited)

99" boxster with 160k. No leaks all service up to date and no warning light. At idle I get this whistle noise which sounds like it is coming towards throttle body not sure. Check all pulleys and thy are all fine. Car drives great but once at idle the noise comes back and goes when driving. Here is a video I made I what it sounds like at idle.

Edited by Loren
made video a download here
moosey Member

moosey

Posted
  • Author
Posted

Anyone have any ideas what this sound could be? Checked all pulleys , belt, water pump and all seems fine. What else can I do?

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Loren Member

Loren

Posted
  • Admin
Posted

Does any of that sound still exist if you remove the polyrib belt and run the car (short time only please)?

Also, does it stay the same with RPM changes or speed up and slow down with RPM?

moosey Member

moosey

Posted
  • Author
Posted

Does any of that sound still exist if you remove the polyrib belt and run the car (short time only please)?

Also, does it stay the same with RPM changes or speed up and slow down with RPM?

I have not tried to start the car without belt on as I did not know it was ok to do so, but the noise stays on when driving and at idle

moosey Member

moosey

Posted
  • Author
Posted

Does any of that sound still exist if you remove the polyrib belt and run the car (short time only please)?

Also, does it stay the same with RPM changes or speed up and slow down with RPM?

I have not tried to start the car without belt on as I did not know it was ok to do so, but the noise stays on when driving and at idle

Removed belt today and started motor and sound went away, put belt back on and sound came back . The sound is coming from some where on top but can't pin point. Listen to all idlers and pulleys and none make noise or wobble. Suggestions on what to do next would be great if anyone out there has had this similar noise. Can it be a pulley even though none make noise or wobble? Car has 160k on it 5 speed.

moosey Member

moosey

Posted
  • Author
Posted

Looked at problem again so I decided to open oil cap when engine was running and it was very difficult to open and take off. No problem with engine off. Let motor run for 20 min to listen and now if I had to guess it is coming from the aos but can't be completely sure . I do get white smoke every now and then buy no idle problem and drivability as the car drives great. Could this be an AOS problem just with a different symptom ? Or do I have two problems . Don't really want to change if I can be sure. So if anyone out there has had this same or similar problem which was cured by replacing AOS please leave feedback. Thanks

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JFP in PA Member

JFP in PA

Posted
  • Moderators
Posted

When the AOS fails, the vacuum level jumps from around 5 inches of water at the oil fill cap at idle to over 20 inches. If you do not have the equipement to check this, and the cap is very difficult to nearly impossible to get off at an idle, you need an AOS. The fact that you are also seeing smoke is a second indication. Do the AOS and be done with it before it totally craps out and strands you, or worse..............

moosey Member

moosey

Posted
  • Author
Posted

When the AOS fails, the vacuum level jumps from around 5 inches of water at the oil fill cap at idle to over 20 inches. If you do not have the equipement to check this, and the cap is very difficult to nearly impossible to get off at an idle, you need an AOS. The fact that you are also seeing smoke is a second indication. Do the AOS and be done with it before it totally craps out and strands you, or worse..............

Thanks I confirmed it is the AOS! Took off top pipe that goes to intake and covered both hole that it would normally go into with cloth and started motor and no noise! Put back on tube from AOS to intake and noise came right back. Thanks!

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