Smoke on start up

[timbo]

Hi all, I think I might know what my problem is but just wanted some confirmation and advice. 2000 2.7 tip with 80k smoking like crazy on start up in the morning and at the end of the day when I return home from work, little bit at other times depends how long I leave it to sit. Now I know the flat six is prone to a little smoke at start up but we are talking embarrassing levels here. No smoke during driving or on overrun, I'm thinking possible AOS, any thoughts/advice/costs etc appreciated. ps is there a way of bypassing the AOS to confirm diagnosis?

[jeffreyedgar]

If you do not get this fixed, then there will be more problems to follow such as an oxygen sensor, catalytic converter, tune-up, etc. Take it in for service right away.

[txhokie4life]

Technically yes there is -- there is a tube that goes to your intake from the AOS.

If you were to pull that -- plug the intake side -- you might be able to tell. But its also possible there is enough oil residue in your intake system

that you'll be burning off oil for some time.

however an easier method is to unscrew your oil fill and put your hand over top. If there is moderate to strong suction with engine running -- it's almost assuredly your AOS.

Mine was terrible on quick left hand turns.

Mike

[deptotpr]

This would be my first replacement, then check status.

http://www.pelicanparts.com/techarticles/Boxster_Tech/19-FUEL-02_Sensor/19-FUEL-02_Sensor.htm

[timbo]

Thanks guys, I think its time to buy some parts!

Edited January 19, 2013 by timbo

[timbo]

So today I removed the tube into the air intake as has been suggested by Txhokie4life and plugged the hole, I'll drive it for a while and see if the smoke reduces, fingers crossed.

[txhokie4life]

Did you check the oil fill tube for vacuum?

[timbo]

Update, the disconnection of the AOS confirmed its failure, New AOS fitted and no more excessive smoke and smoother idle.