P0455 / charcoal canister clogged?? (Tech 2 videos) - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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P0455 / charcoal canister clogged?? (Tech 2 videos)
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Posted by Jason 5W-30 [Email] (#2180) [Profile/Gallery] (more from Jason 5W-30) on Sat, 14 May 2022 09:56:26 Share Post by Email
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So I’ve been hunting this cause of my ‘02 9-3 Vert’s P0455 CEL and I’m stuck

I checked the purge valve, it looks pretty new actually, and it holds vacuum when no power is applied. Apply power and it opens properly. With the car running there is vacuum out of the bottom port. So I don’t think it’s that.

I put on a new Orio/SAAB gas cap.

I changed the rubber hoses including the one that attaches to the back of the throttle body, they had small cracks but nothing that went all the way through.

I also changed the canister close valve (in the wheel well) but I think the original one was okay, actually.

With Tech 2 I commanded the canister close valve closed, and when I pulled vacuum with my MityVac on the purge connection on the canister, it held vacuum!! So I’m thinking that there’s probably no leaks with the canister, the fuel tank, or the hose going to the canister close valve.

Also, I know the car got a new fuel pump about a year before I got it, so I checked the tightness of the locking ring, and found it to be at the proper torque setting (55 lb-ft).

Is it possible that the charcoal canister is clogged? When I pulled off the hose that goes from the canister to the tank, there was a little gasoline that came out.

When the car does an EVAP integrity test, it goes down to -0.272 kPa, sometimes -0.300 kPa if it’s cold out. But from what I understand, it needs to get to -0.600 kPa within 23 seconds, or else it’s flagged as a P0455.

My hypothesis is that the charcoal canister is clogged up, and so the pressure can’t go down quickly enough to meet the criteria for.

Here’s a video showing the car testing itself after a cold start.

https://youtu.be/ynaXz1OBYMQ

This second video is after a “forced” test via Tech 2, engine was hot.

https://youtu.be/5HL3R60B8Ak

_______________________________________ Past: '88 9000T, '02 9-5 Aero,'92 900 S Conv Current: '02 9-3 Conv


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