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Carbon Canister Issue

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Hi There Folks,


I recently had to remove my carbon canister from my 2000 Boxster S (3.2L) because I had to remove & replace a smashed AC line running from the front to the rear on the passenger side.  This required R&R of the carbon canister to access the line.


Upon starting the car back up I am hearing quite a bit of "popping" coming from the canister location.  It sounds just like a vacuum pump trying to create a vacuum in a system.


Is this normal?  Will it go away?  I haven't thrown any codes, and the car is running just fine.


Obviously, any vacuum that would be in that system was totally lost when I disconnected all of the hoses in order to remove the canister.

Is it trying to build back up a vacuum in the system?  I don't believe I connected anything incorrectly.


Any thoughts?  Ideas? 


Thanks in advance everyone, I appreciate your help.



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There are a couple of Evaporative Control System valves for controlling vacuum and shutoff... Could it be the valves you are hearing? I hear mine operate all the time when sitting at a traffic light.

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Well, its coming from the right front wheel well.  I think that something may be loose, I just removed the hoses and reinserted all of them.  We'll see how it goes.  I have never heard these sounds before.  I removed the carbon canister to R&R an AC line, and when I put everything back together, it started making a noise like a vacuum pump trying to pump up a vacuum.  That's the best I can describe it.  I have never heard this sound in either of my 986s or 996.  Its definitely coming from the carbon canister tho. 


We'll see what happens now, I am getting ready to restart it now.  I'll keep you posted.





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Apparently, one of the hoses was knocked loose as I put the plastic wheel well cover back in place.  The noise is gone, and the new AC hard line is installed and the AC works, and blows at about 42 degrees, and the carbon canister is no longer making that annoying noise.  It was the canister with the three hoses up on the top, and it was the outermost (against the outside fender) hose that had worked loose.


What a mess that board that I ran over ended up causing.  But, its all fixed now!


Thanks  Jager for the comment.

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