Evap cannister question

[gregkelley]

1999 Boxster. I got a P0446 code. One of the possibilities is a bad EVAP cannister. I'm trying to determine if my car is ORVR or not. Looking at my build codes under the hood, I have neither M660 or M664. Big difference in cannister costs. Anyone have an idea on where I can turn?
Oh, and regarding the P0446, other things to look at other than the cannister?

[spinjockey]

It could be the purge solenoid under the manifold. Do you have any other symptoms like difficulty fueling or hard to start after fueling when hot?

[gregkelley]

Originally Posted by spinjockey

It could be the purge solenoid under the manifold. Do you have any other symptoms like difficulty fueling or hard to start after fueling when hot?

No difficulty fueling. I have had issues starting when it is warm, once in a while. I also have excessive vacuum on the gas cap when I open it after driving.

How do I determine which cannister I have?

[spinjockey]

Originally Posted by gregkelley

No difficulty fueling. I have had issues starting when it is warm, once in a while. I also have excessive vacuum on the gas cap when I open it after driving.

How do I determine which cannister I have?

You can call a Porsche dealer parts dept or pelican parts. They can decode it from your vin.

You probable have a failed evap solenoid. If you replace it get the Porsche part with the hose attached. Buying the solenoid separately is difficult to get sealed.