Air/Oil Separator replacement: What else need to be done?

[Trey T]

Air/Oil Separator replacement: What else need to be done?

I am ordering the AOS from pelicanparts.com for $112 and wanting to replace it myself. I will check and clean the MAF sensor but what other things do ppl replace or clean?

Thanks,

[kbrandsma]

I replaced the J tube when I did my AOS replacement. The J tube connects the AOS to the throttle body. Can't be sure why I did. It's been a couple years ago.

[Trey T]

Gotten replaced. Took about 2 hrs wrestling the thing in and out. Ended up using a generic hose clamp.

I didn't replace anything else, just the AOS.

Dense cloud of smoke lasted about 5min. The remnant of oil went away after 50k miles or so.

Were there any revision to the AOS device?

[Trey T]

I'm going to replace the sparkplugs on this car, which only have 41k on it.

Made the 200K miles trip and getting ~22MPG.

[1schoir]

"....The remnant of oil went away after 50k miles or so.

...

50k miles for the telltale signs to disappear? That's a lot of driving with smoke!

jk...congrats on changing it out before it caused a problem.

Regards, Maurice.

[Trey T]

lol... 50miles. but yeah.... no more smoke. it's crazy the amount of smoke it makes after it starts up. Thinking back at when the AOS failed on the highway, the couple drivers behind me was prolly pretty pissed.

[1schoir]

lol... 50miles. but yeah.... no more smoke. it's crazy the amount of smoke it makes after it starts up. Thinking back at when the AOS failed on the highway, the couple drivers behind me was prolly pretty pissed.

Trey:

Better that they get a little inconvenienced than your engine suffer a hydrolock!

Regards, Maurice.

[efahl]

Reviving the newest thread I could find on this topic, just want to document the symptoms in case it helps others...

Just finished mine, 1997 Boxster chassis, 2001 3.4 motor. The original AOS from the Boxster's 2.5 was on the 3.4 motor, it had the horizontal diaphragm chamber.

The very slowly accumulating symptoms were hunting idle, stalled once at a light and driveability at low throttle became increasingly difficult (throttle control off idle was jerky and it felt like you were going to stall especially when cold). The final and highly diagnostic symptom was a 3-4 shift at redline resulting in a huge cloud of smoke in the mirror and the consequent "OH $HIT" moment. After the big puff, the smoke was fairly visible and continuous, but not thick. I got home, did the odd googling, which lead me to pull the J-tube out (plugged it on the intake manifold end) and the smoking stopped almost immediately. I also noted that the idle was smooth with the plugged J-tube, which simply reinforced the already obvious diagnosis.

Got the new one, installed this morning in about 2 hours elapsed time, probably half of which was just cleaning off the accumulated crap on the engine (godliness is next to cleanliness :)). It's a pretty easy job, the only tricky part was re-installing the accordion hose clamp on the bottom (I couldn't find my big box of Real Hose Clamps, so I reused the spring clamp).

Started the motor with the cover off, checked all my fittings and it looked good, so took it for a drive and wow the car was transformed. I can't believe how much the leak affected driveability, rolling off a stop smoothly is quite easy now and I'm surprised that I was so acclimated to the poor behavior that I didn't figure it out sooner.

[logray]

Nice work.

For the spring clamp you recycled (sounds like a couple times), I recommend going in and replacing that soon if it's not too difficult for you. Once you "unspring them" a couple times they lose their spring and have a tendency to start making the connection weep.

I prefer the high quality stainless worm style clamps myself, even though some say a fresh spring clamp might be better because it expands and contracts with heat expansion. Hogwash!

[Polly]

Where is the best UK place to buy a new AOS for my 2001 Boxster S Tiptronic?

[timbo]

Got mine from Porsche Bournemouth for £68 last year, £99 to fit it.