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Just did mine on my 99 Boxster Base. Mine would smoke heavily, but only very occasionally say for example the first start after a spirited drive. So I replaced it with a URO brand I got from Rock Auto, about $120 American if I recall. I was already doing several other maintenance items, the coolant reservoir tank in particular and the AOS is in the vicinity so I did that as well. Not that difficult even with the engine in the car, unlike the 996. The bellows clamp was the tough part, but I used a screw clamp there which made it somewhat easier but still tricky to make sure everything was aligned/seated properly before tightening. Also, make sure that the hard plastic crossover line from the air intake manifold is properly seated/connected on the AOS, its at a strange angle with several other hoses/wires/ injector lines in the way and tough to seat. I tried several times and each time when I tugged on the line after seating it, it would slide right back off. You have to apply enough pressure at a difficult angle to ensure the connector engages and won't pull off after. Best of luck.
I know, URO quality can be shady, but the Boxster AOS is easily accessible as opposed to my Carrera's AOS, and even the higher quality/name brand AOS's fail randomly right out of the box. For my budget/situation, URO works for now.
I know, URO quality can be shady, but the Boxster AOS is easily accessible as opposed to my Carrera's AOS, and even the higher quality/name brand AOS's fail randomly right out of the box. For my budget/situation, URO works for now.
You paid $120 for a URO part... and P e l i c a n sells the Porsche part for $116.
Just did mine on a 98 2.5 with 195k kms that still had its original AOS (with the circular diaphragm housing placed horizontally instead of upright / vertically) . Replaced it not because of a smoking engine but because of a slight vacuum leak caused by the faulty original design of the o-ring (see arrow in pic below).
05-23-2020, 09:20 AM
