2002 Boxster knocking sound...once and a while

[john90290]

Car had one owner, dealer maintained, all service done, 97k. After car in warm, usually when i get home from work, i get out of the car to open the garage and i hear a knocking sound coming from the rear. The driveway is on a slight incline and when I drive it into the garage, I don't hear the noise at all. It does not happen all the time.

I know IMS is a go-to but i also hear IMS has no warning other than oil leak and or failure. Also, if it was IMS which is a bearing issue, wouldn't it be all the time? The one's i've seen on Youtube are much louder and are constant. Mine is a subdued knocking and then goes away after I move the car into the garage?

I searched a bunch and found a guy in 1999 who had this problem and it was an AC issue - expansion valve and rec/drier. Same deal with only occasional sound.

Not sure what to do. Was saving up for the IMS upgrade here in San Diego anyway just not quite there yet.

Does anyone know if Dieter's in San Diego is any good?



Thanks for all the help, not a hater btw, love the car.

-John