Air/Oil Seperator write up? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

kellysplanet · 03-29-2009, 07:18 PM

I noticed that the main sign of this part going bad was pulling the oil cap while running. I tried it after the swap and my car almost died the idle went so low. I could also hear a loud hissing "air suction noise" coming from the part. Did I crack a hose or no lock it in properly? Have any of you heard this? I am afraid to drive it until I can figure if it is done correctly. At least I found the cause of my major oil leak when I swapped this part, I hope that was it, loll. If anybody could give me a sign that it’s okay the noise is normal and the idle drop is normal, it be greatly appreciated.

Viper5 · 03-30-2009, 08:05 AM

Talk about convenience. I'm gonna be ordering a AOS today.

wanna986 · 03-30-2009, 06:35 PM

Quote:

Originally Posted by kellysplanet

I noticed that the main sign of this part going bad was pulling the oil cap while running. I tried it after the swap and my car almost died the idle went so low. I could also hear a loud hissing "air suction noise" coming from the part. Did I crack a hose or no lock it in properly? Have any of you heard this? I am afraid to drive it until I can figure if it is done correctly. At least I found the cause of my major oil leak when I swapped this part, I hope that was it, loll. If anybody could give me a sign that it’s okay the noise is normal and the idle drop is normal, it be greatly appreciated.

Not sure I understand...
Are you saying that with the bad part, the cap being pulled off results in the car almost dying?

kellysplanet · 03-30-2009, 08:21 PM

Sorry for the confusion, before pulling the AOS it was very hard to get the oil cap off while the car was running. I guess from the back pressure and had the severe smoke. Now no smoke but when I pulled the oil cap off now the idle goes way down almost to a stall out. I can also hear a loud hiss noise coming from the part, has anyone else tried this yet or heard the noise. I just want to make sure I have the hoses on tight, tripple checked no leaks. I took it for a test drive tonight, ran alot quieter smoother, feels like has more power. While driving slow riding through the movie theater, sounded and felt like was going to stall out. Any guesses.

Thanks,
Kelly

Fletch986 · 03-31-2009, 05:13 PM

Just replaced AOS on 2000 Boxster. It took 3 hours but will be faster the next time. the instructions posted were extremely helpfull. the lower spring loaded clamp was by far the biggest PITA but i ended up cutting the bellows, pulled the AOS out and had better access to the clamp. i replaced the lower clamp with a "screw" type clamp to make the next time easier.

this was my first repair job on the car and i have to say that i hated the "small" work space i had to deal with. my other car is a corvette and i now appreciate having a large engine bay to work in without working around a clamshell.

all in all, not a bad repair and worth the time to DIY instead of paying someone else to do it.

Fletch986

wanna986 · 03-31-2009, 08:03 PM

Quote:

Originally Posted by kellysplanet

Sorry for the confusion, before pulling the AOS it was very hard to get the oil cap off while the car was running. I guess from the back pressure and had the severe smoke. Now no smoke but when I pulled the oil cap off now the idle goes way down almost to a stall out. I can also hear a loud hiss noise coming from the part, has anyone else tried this yet or heard the noise. I just want to make sure I have the hoses on tight, tripple checked no leaks. I took it for a test drive tonight, ran alot quieter smoother, feels like has more power. While driving slow riding through the movie theater, sounded and felt like was going to stall out. Any guesses.

Thanks,
Kelly

Thanks for the clarification. I'm wondering if someone without AOS issues could indeed remove their oil cap and tell us what happens.

I've never had a car that was so sensitive to the removal of the filler cap and, like you, am wondering if this is normal.

Viper5 · 04-04-2009, 10:18 AM

I don't understand how those pictures were taken. Under my car, there is next to no room. The pictures seem to illustrate that this is not the case. I can barely see any of the bolts and clamps.

Viper5 · 04-04-2009, 10:54 AM

I've gotten everything except for the orange part inside of the engine (i'm guessing this just slides out once I take care of my 2nd problem and the lower clamp that is seen in the picture with the pliers. I don't have any room to grab it so I can pull it off.

UPDATE: I managed to successfully instal my new AOS. Took about 3 hours. The hardest part for me was figuring out how to reach the bolts underneath and undoing the lower black grip that you have to squeeze both sides to release. That was a B****. Even getting it back on was somewhat difficult. I also seemed to have disconnected an electrical socket around that part. I think it has to do with the O2 sensors, but I just put it back in after messing around for a little. All in all, great instructions and the pictures really help. Thanks!