Smoke when engine is cold

[felixliter]

Hi,

I've got an Boxster S 2000.

I've read a lot of the topics concerning smoke when cold but just to be sure before I start to work.

It is smoking roughly after 20sek until warm (5-10min), then the smoke disaper.

Engine oil looks good (clear black/brown).

Coolant is also clear.

I've changed the MAF.

I've done the oilcap test, but the cap is easey to remove (no sunction), starts to idle a bit strange.

The smoke looks quite white to me.

I can hear a whistle noice when I release the throttle after reving (a bit like a Turbo engine).

There are oil leakage arround the hose clamps (see picture)

Beside this the car is running great, no fault codes. 

Can it be anything else than the AOS?

 

[JFP in PA]

Besides the AOS, there are a couple possibles, but non are good. If you have oil residue in the intake system, I would still get the AOS checked out (you need a digital manometer that reads in inches of water and hooked up to an old oil cap), at idle you should be seeing less than 5 inches of water vacuum.  If there is more, the AOS is on its way.

 

It could also be coolant from a cracked head.  For this you need to pressure test the cooling system and leak down test the engine, looking for unexplained pressure losses.

[felixliter]

Hi,
Thanks for your answer.
I took away the inlet tube (rear one) and the connecting hose from the AOS, there were quite a lot of oil there.
Regarding the othe inlet tube (towards the seats) there is some sort of vacum controlled flap there, Can I just pull the vacum line out from the flap or do  I need to disconnect it from the sensor (electrical) contact cloose to the airfilter?
It seems to be fastened hard and I dont want to breake anything.

[JFP in PA]

Hi,

Thanks for your answer.

I took away the inlet tube (rear one) and the connecting hose from the AOS, there were quite a lot of oil there.

Regarding the othe inlet tube (towards the seats) there is some sort of vacum controlled flap there, Can I just pull the vacum line out from the flap or do  I need to disconnect it from the sensor (electrical) contact cloose to the airfilter?

It seems to be fastened hard and I dont want to breake anything.

 

You should be able to disconnect it from the electrical unit without a problem.

[felixliter]

Hi,
So the line (position 29 in the spare part manual) shall not be removed from the actuator (26)?
Shall it be removed from the sensor (were the electrical contact is on top)?
I'vetried to pull without any luck.

BR//Jonas

[JFP in PA]

Hi,

So the line (position 29 in the spare part manual) shall not be removed from the actuator (26)?

Shall it be removed from the sensor (were the electrical contact is on top)?

I'vetried to pull without any luck.

BR//Jonas

 

The connectors take a heat soak seat at the fittings and sometimes require a little heat to loosen them up. 

[felixliter]

Ok, but should I remove the electrical contact with the hose on? There is no room to disconnect the hose from the sensor.

Or shall I try to remove it from the the actuator (26).

http://www.renntech.org/forums/uploads/downloadedimages/107-10.jpg

[felixliter]

Any ideas?

[JFP in PA]

As I mentioned earlier, we often use a heat gun to loosen up these connections.  If you cannot get yours off, remove it with the switch still connected.

[felixliter]

Thanks, solved the probelm, after some struggle I could remove the sensor with the hose attached.