My Tech How-To for the Carbon Vapor Canister

[scotty1998]

I think the thought that those studs are for another model's bracket is more plausible than anything. Definitely not for us though

And, I agree. Leave the condensation/liquid/vapor seprator where it is. It keeps moisture out of the can. (At least that's what I've been told)

[Jayrodoh]

Awesome write up! Mine is shot and I've bought two from members only to have the same problems and a box of charcoal.

[Fiodh. Argus]

Awesome write up! Mine is shot and I've bought two from members only to have the same problems and a box of charcoal.

I guess you could have a BBQ

[j20brett]

So i cant exactly tell from the pics, but the breather is 100% capped off correct?

[BlacksheepGW]

So i cant exactly tell from the pics, but the breather is 100% capped off correct?

No, it has little open passages on the nipple that goes into the breather hole. I may use a peice of hose and run it up the side and out for better ventilation, or use a filter on it.

[FSJ Guy]

For those of you who don't want to buy it online, tell the parts counter person you have a 1993-1995 Grand Cherokee.

You'll get the same part. Comes up Part # CP 1061 from O'Reilly's.

[scotty1998]

Coool we have another part number to go by!!

You are correct Blacksheep, the breather is not capped off. If you turn it over, the plug is an "X" shape that fits in the hole and lets air through. Think of the cap on the outside as a mushroom

[BlacksheepGW]

Scotty, I owe you a drink if you are ever on teh west coast!!

Oh, and here is a pic of the Jeep you helped me get going. Even with 31s and stock gears, it has plenty of oomph! Especially when I run Premium

[scotty1998]

A very sweet ride! And, I'll take you up on that drink when I'm in town

[j20brett]

Coool we have another part number to go by!!

You are correct Blacksheep, the breather is not capped off. If you turn it over, the plug is an "X" shape that fits in the hole and lets air through. Think of the cap on the outside as a mushroom

So this cap comes with the canister or is it something im gonna have to find?

Edit: Found it.

[jc turtle]

The part number on the top of the new canister is a Mopar/Jeep number.
Probably from a 93 Grand Cherokee. John

[skinnyD]

Im so glad this thread is still going. I tore out the carb yesterday and had a look inside. I found charcoal in around the powervalve and also inside and around the fuel inlet. The mesh filter in the inlet was dirty but not plugged solid.
I dumped the gas out and gingerly cleaned it out with compressed air all around the carb-got it cleaned up. I just rebuilt/dipped it 3 weeks ago. Before the rebuild, I discovered what I thought was hard ball like carbon build up in the same areas as I just described. I didnt know about that black "coffee can" thing on the passenger side fender...charcoal vapor canister is its official name I think. Well thats what I found in the carb last night?!
Then I proceed to pull the cap on the purge valve(being mindful of the spring thanks solely this thread )on the canister and find just a tiny tiny tear on the black rubber diaphram and now Im bummin. But I did figure out whats been ailing my poor wag the whole time...I think.
So my question is, of everybody here thats changed out your charcoal canisters, were any of you having idleing, surging, bogging issues? Because Ive done just about everything else(carb rebuild, replace fuel/vacuum rubber throughout, gutted cat conv., checked float level). It does need plugs and timing adjustment I think, but...
Sorry for the long post BTW

[BlacksheepGW]

Mine had some idle issues and would stall during some acceleration. Its seems good so far. I DID have a vacuum leak, but I fixed that as well. It still idles a bit rough, but I KNOW I need a tune up and maybe a carb clean/rebuild

[scotty1998]

Skinny,

Those were my problems exactly. Surging, weird idle, acceleration wasn't punchy. It would be worse at times/better at others. I could never explain it. I checked and rechecked my vac system. Sometimes I'd find a loose or missing connection and I'd shout, Eureka! only to find that it just dumbed the problem down but didn't fix it entirely. The worst part was chasing the idle adjustment. I'd tune it to where the engine wouldn't stumble so much, take it out on the road, come back and either it would be worse or far too rich. Then I'd lean it out and repeat. Same problem just no richness odor. Uggh. I remember tuning the carb in shopping centers while I'd wait for my wife thinking, this is gonna be the time that I lick this idle thing.

Several board members through the years pointed me to EGR or the Vapor Canister. I knew that the can diaphragm had a hole in it so I coated it with a silicon caulk. That definitely helped but did't fix the problem. And... it never held vacuum. Oh well I thought. Can't get one of these anyway. So I moved onto other things.

So... dopey me does the following. Rebuilds his carb, replaces the EGR, new PCV, replaces all of the vac lines that I could find, upgraded to TFI, made sure I always had brand new air cleaners, replaced my wires and plugs, gapped and regapped the plugs, tightened and retightened the carb to the intake, check for vac leaks, played with the static and vac timing, and on and on. Now, in reality, the rig probably needed all of this done anyway but sheesh, it all came down to a stupid diaphragm? The bottom line is that if I just put more emphasis on the vapor can thing, I could have avoided alot of time and money.

You can test the can. Draw vacuum at the ported vac nipple (at the cap) and it should hold for a while. Or, start the engine up and remove the ported vac hose from the cap. You should not feel any air coming out of the nipple at idle. With mine, I could fill a balloon.

[skinnyD]

Right on guys! I feel like Im chasing the real issue around. It will run nice sometimes and really crappy other times and it is like...what changed to make it run like this???????

So what can I do about the darn diaphram? Would shoo gloo do the trick as a temp. fix? Its my DD and I need it running ASAP. I am going to order a replacement from rockauto.com, but for now what can I do. I have the carb cleaned out and ready to put back on and its literally one little tear in the diaphram(not swiss cheese luckily).