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To revive an old thread, I would just like to share my results from removing the charcoal canister.
I was getting a LOT of vacuum in the fuel tank, it would take 5 or 6 seconds after opening the gas cap when refuelling to equalise the pressure to that of the atmosphere. I was also experiencing the car revving itself at idle, particularly when warm.
Anyway, I removed the canister more or less as described in this thread. No more vacuum in the tank, the car still revs itself a little, although it is definitely at least 80% better than it was. Best of all, no CEL! I did leave the valve at the top of the fuel-filler tube in-situ, although none of the tubes are plugged into it.
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