After nearly 2 years, I've finally replaced my AOS!

[2000SoCalBoxsterS]

Originally Posted by chitowndad

Can you replace the AOS with oil in the car or do you have to drain it out first? I just replaced the 9.75 quarts of expensive Mobil 1

-Steve

I hope you meant to say you replaced the 9.25 quarts of expensive Mobil 1 oil. You don't want to over fill with oil lest you ruin your Cat's which are very expensive.

[chitowndad]

Thanks CJ. I'm planning on replacing mine in the near future - next several months.

Regarding the number of quarts. I fully drained my 2001 S and according to the dip stick it took 9.75 quarts to refill. The oil gauge on the dash was one tick below full which is what I read on this forum as the full mark.

Thanks,
-Steve

[TheGoose]

CJB - what other symptoms did you have before replacing the AOS? I have smoke at start-up and a bunch of other problems that may be AOS related. When cold, the car has no power and it stalls/backfires badly with acceleration. Only when it's warmed up a bit does it come get a little life? I've "cleaned" the MAF with no luck. The problem started slowly over the last few weeks and is pretty bad now. My nearest shop is 4 hours West! Any ideas?

[CJ_Boxster]

Originally Posted by TheGoose

CJB - what other symptoms did you have before replacing the AOS? I have smoke at start-up and a bunch of other problems that may be AOS related. When cold, the car has no power and it stalls/backfires badly with acceleration. Only when it's warmed up a bit does it come get a little life? I've "cleaned" the MAF with no luck. The problem started slowly over the last few weeks and is pretty bad now. My nearest shop is 4 hours West! Any ideas?

Hey Goose, I had those same problems early on as well. Before replacing my AOS i went ahead and bought a new MAF and that fixed the weak cold engine issue but it still wasnt 100% when cold. After replacing the AOS, the cold engine power was back to normal and my idle was perfect and didnt hunt around when my AC was turned on.

'FYI I had to replace my new AOS twice, The first one still caused puffs of smoke and the idle steadily got worse, the second AOS actually sounded like it had a 9mm bullet firing out of it and my idle steadily got worse. Of Course the dealer gave me new AOS for free since this is a defect in the AOS they giving me so keep a close watch on my AOS for oil leaks and little bits of exhaust smoke cause you may get a defective unit and you can only replace it free if you report it as defective 30 days from purchase.

[TheGoose]

Thanks CJ, I will order the AOS kit and change it out ASAP. I have to order cost effective parts from the US to get good pricing, so it takes some time to reach me. Funny thing though, I pulled the MAF plug off for the second time and this time let the engine run for about ten minutes. Turns out the blurping and popping in GONE! I'm ordering a new MAF with my AOS! Thanks for the support and advice.

[CJ_Boxster]

No Problem Goose, just glad the info is helpful for yah.