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Unread 05-12-2012, 03:55 PM   #1
lower7
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1988 YJ Wrangler 
 
Join Date: Dec 2010
Location: Boise, ID
Posts: 44
Bad Charcoal Canister?

The jeep starts fine and idles great. However, once it warms up something switches and it begins to idle erratically. However, if i pinch off the vac line between the CTO and charcoal canister(purge) it cleans up. If i remove one of my ported vac lines there is pretty good suction heading in the direction of the charcoal canister. I have the Howell kit and all my lines are connected as per their diagrams. It appears that the purge valve on my charcoal canister is stuck open. Maybe? I took apart the purge valve on the canister and it appears to be in working order. I cleaned it up a bit and put it back in and as soon as it warmed back up, it started it again. Could this be a bad CTO or is it the charcoal canister that is bad? Is there a source for new charcoal canisters?

Thanks,

John

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Unread 05-12-2012, 11:35 PM   #2
timatoe
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1990 YJ Wrangler 
 
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Location: Grass Valley California
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My understanding is that they (AMC then Chrysler) used the same basic canister for twenty some odd years and they are not available any longer new even from a dealership. I had to get a used one from J&W Jeeps in Antelope CA, they'll ship but they're pretty proud of their parts there.
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Unread 05-13-2012, 12:48 AM   #3
NonRubicon
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The CTO prevents vacuum from passing through the valve when the engine is cold, to prevent the EGR from operating and the emissions canister from purging. If the CTO were stuck open, I would expect the idle problem to also occur when the engine is cold, the EGR would operate too (which it shouldn't when cold). If the CTO were stuck closed, then the EGR and canister wouldn't function at all hot or cold. From what you described, it makes me suspect a problem with the canister. Some sort of vacuum leak with the purge signal line.

If you're looking for a new canister, just swap in a vacuum canister for a '90's 4.0L Wrangler/Cherokee. This canister will have the tank vent line, purge line, and purge signal line you need for the Howell conversion and won't require capping any ports. I put one in my YJ when my OEM canister went bad. Seemed to be a bit more snug of a fit than the OEM, but no problems otherwise.

FWIW, for any other folks that come across this post, the 4.0L canister can also be modified to work with carbed YJ's by drilling open the plugged port to hook up the carb vent line.

The OEM part number for the 4.0L canister should be 53030500. I got mine from rockauto.com
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Unread 05-13-2012, 09:46 AM   #4
lower7
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Thanks. I think i will go ahead and pick up a 4.0 canister and see if that fixes things.
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Unread 05-13-2012, 11:18 AM   #5
timatoe
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I think the 4.0 canister has one less port, but it should be the same port (or lack of) that you cap off with the Howell anyway.
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Unread 05-18-2012, 07:38 PM   #6
lower7
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Follow up: I got the new 4.0 canister from RockAuto yesterday. Installed this evening. Problem solved. Manifold vac was pulling through the evap canister and messing up my ported vac.

its running so quiet now that, i am hearing other issues.

Thanks for all your help!!!

John
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Unread 05-18-2012, 07:43 PM   #7
superj
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1987 YJ Wrangler 
 
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Location: corpus christi, texas
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ha ha ha, badass its running great though!!
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