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Old 03-17-2013, 05:49 PM   #1
Boxster 1999
Join Date: Feb 2013
Location: Canada
Posts: 67
Oil separator making noise on ignition

I hear a noise from the oil separator as soon as I switch the ignition on. Sounds like a fluorescent ballast ready to blow up. Is this normal or I should change it. Thaks in advance!
Edit: I have a Boxster 99 2.5l

Boxster 99

Last edited by Barteur; 03-17-2013 at 05:50 PM. Reason: Added information
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Old 03-17-2013, 06:06 PM   #2
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Join Date: May 2011
Location: Miami florida
Posts: 1,591
You are probably hearing the air injection system, which injects air into the exhaust to lessen emissions on start up. The AOS does not make any noise, even in failure mode.
Current car

2000 Boxster 2.7l red/black

Previous cars

1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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Old 03-17-2013, 06:10 PM   #3
Boxster 1999
Join Date: Feb 2013
Location: Canada
Posts: 67
I thought it was this part since when I put my hand on it and kind of shake it the noise change. Is this a normal noise?

Boxster 99
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