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post #1 of (permalink) Old 02-25-2004, 06:07 AM Thread Starter
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CJ Evaporation Canister

I am running a Weber 32/36 on an 84 CJ7. 258, TFI upgrade, no computer or harness, Flowmaster. It runs great but continually runs rich. I have leaned the carb with air/fuel mix and idle speed (600 rpm) Timing is good, fuel pressure is good (below 3 psi), no vacuum leaks in lines or at carb, no emissions (CTO, EGR) or cat converter installed. A bare bones system.
I am questioning my Evaporation Canister. Is it being used properly? Does bypassing the CTO and EGR diminish it's effectiveness? I have attached a vacuum diagram that represents the setup in my CJ. Opinions and pointers would be appreciated.
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post #2 of (permalink) Old 02-25-2004, 07:27 AM
 
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Re: CJ Evaporation Canister

Is the "X" in your diagram hooked up? I believe that purge valve needs to be hooked to a ported vacuum source for the canister to purge. I don't know if it will make a difference with your problem or not.
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post #3 of (permalink) Old 02-25-2004, 08:05 AM Thread Starter
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Re: CJ Evaporation Canister

No, the "X" (the purge signal) is the port that I have plugged. It comes from the CTO valve. The purge line comes from the PCV valve.
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post #4 of (permalink) Old 02-25-2004, 08:09 AM
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Re: CJ Evaporation Canister

You don't have it hooked up correctly. Read here.

Your green line should be hooked to manifold vacuum and the one with the x should be hooked to ported vacuum. You need a CTO in the ported vacuum line to keep it from purging while the engine is cold.
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post #5 of (permalink) Old 02-25-2004, 09:23 AM Thread Starter
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Re: CJ Evaporation Canister

I see. I still have the CTO (new) installed. Guess I'll run back to it. I understand how this helps a lean problem but will it aid in the elimination of my "too rich" troubles?
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post #6 of (permalink) Old 02-25-2004, 12:28 PM
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Re: CJ Evaporation Canister

I don't think this has anything to do with it. It is just not hooked up correctly.
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post #7 of (permalink) Old 02-25-2004, 03:21 PM
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Re: CJ Evaporation Canister

Just an FYI, but my CJ runs kind of rich too. The only real difference between ours is I'm running a MC2100 and no canister everything else is basically the same.

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post #8 of (permalink) Old 02-26-2004, 05:35 AM Thread Starter
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Re: CJ Evaporation Canister

Must be the needle valves in the Weber. Guess i need to investigate some replacements or swaps. Thanks for the input.

Scott
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post #9 of (permalink) Old 02-26-2004, 01:37 PM
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Re: CJ Evaporation Canister

Turned out to be good for me too. I didn't realize that hooking up the ported vacuum through the CTO was important. Oops.
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post #10 of (permalink) Old 03-08-2004, 06:31 AM Thread Starter
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Re: CJ Evaporation Canister

I'm back. I am having oil blown out through my oil breather now. This has never happened before. I'm back to the Evaporation Canister- could this be the culprit causing it?
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