2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Charcoal Canister

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Old 06-22-04 | 09:20 AM
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Charcoal Canister

My charcoal canister broke and i was wondering what i could do. I know that some guys get rid of their carcoal canisters ... so what do i do. one of the plastic attachments that goes to the hose broke off. i dont know what can be done with the 3 rubber hoses. thanks
Old 06-22-04 | 09:29 AM
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Should be easy to find one used/scrap for free. Or just glue the nipple back on.
Old 06-22-04 | 09:33 AM
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I presume it's the top gas tank vent or the crancase vent line.
The bottom hose is just an atmospheric vent.

JB weld the origonal or a replacement nipple back on.
Old 06-22-04 | 09:45 AM
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gotcha. thanks guys. i cant believe i dint think of that
Old 06-22-04 | 12:37 PM
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or you can go to a junkyard and buy one for 12 bux( I did)
Old 06-22-04 | 02:05 PM
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12 bucks? Eek, I just ripped mine out and tossed it in a box.
Old 06-22-04 | 02:49 PM
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I want to do that, Does the car stinck alot ? and also where does the crank case inlet go. Thanks
( sorry for borrowing the thread )
Old 06-22-04 | 02:51 PM
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I've got like 3 or four of them if you need one, let it go for a few cents over shipping. I was about to tell you to rip yours out until i realised you were in socal. that makes it an entirely dif story :P
Old 06-22-04 | 02:57 PM
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Originally posted by FC3S.USD
I want to do that, Does the car stinck alot ? and also where does the crank case inlet go. Thanks
( sorry for borrowing the thread )
Without the charcoal canister, you route the oil pan vent to a catch can to keep from coating you engine bay with oil.

Sorry for calling it a crankcase vent - old boinger term.
Old 06-22-04 | 02:57 PM
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Originally posted by FC3S.USD
I want to do that, Does the car stinck alot ? and also where does the crank case inlet go. Thanks
( sorry for borrowing the thread )
Eh, it stinks on startup a bit, no biggie. Which line is the crank case inlet? Is that the one that goes to the oil filler neck?
Old 06-22-04 | 03:07 PM
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Originally posted by dDuB
Which line is the crank case inlet? Is that the one that goes to the oil filler neck?
Yes - the side nipple in the oil filler neck.
On a turbo you can block the lower one & use the upper one.
Old 06-22-04 | 03:11 PM
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Originally posted by SureShot
Yes - the side nipple in the oil filler neck.
On a turbo you can block the lower one & use the upper one.

Mine is vented, not routed to any catch can. This is how I've seen it done in a lot of threads about removing the canister, and honestly it is not doing anything. No extra oil is coating anything, it's only oil vapor, and that goes up to the top and leaves a small oil spot on the underhood lining. You can also just run tube to the bottom of the engine bay to have it vent there if you want.
Old 06-22-04 | 03:29 PM
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Originally posted by dDuB
Mine is vented, not routed to any catch can.... extra oil is coating anything, it's only oil vapor, and that goes up to the top and leaves a small oil spot on the underhood lining. You can also just run tube to the bottom of the engine bay to have it vent there if you want.
Not much blowby in an NA with good seals.

Turbo's are another story - more blowby - oil will make a mess without a catch can.
Old 06-22-04 | 03:34 PM
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The charcoal canister has nothing to do with the crankcase vent. The charcoal canister is for FUEL vapours. By leaving the line vented to the atmosphere, you essentially have a hole in your fuel tank. Not a good thing.

The crankcase vent (PCV system, or purge valve) is designed to purge vapours from the crankcase (er, oil pan ) and maintain a vacuum inside the engine to help prevent oil from bypassing seals.
Old 06-22-04 | 03:45 PM
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I don't see how it is harmful at all, because if the charcoal canister becomes full it is designed to dump the extra vapors to the atmosphere, as far as I know. Plus, doesn't it vent the vapors upon startup? I thought I read that somewhere. So merely getting rid of it and having it vent on its own is really the same thing, isn't it?
Old 06-22-04 | 03:48 PM
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Originally posted by dDuB
12 bucks? Eek, I just ripped mine out and tossed it in a box.
meh......i'd rather pay for it....plus...it would be embarassing to get caught and let's not forget te bad Karma that would come from it.
Old 06-22-04 | 04:08 PM
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i bought my car and later found out it didnt have a char canister (first time i'd ever heard of one). the lines are all pluged... with small bolts... =/ maybe i should do something about that. i really don't understand the system at all, though.
Old 06-22-04 | 04:15 PM
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Originally posted by dDuB
I don't see how it is harmful at all, because if the charcoal canister becomes full it is designed to dump the extra vapors to the atmosphere, as far as I know. Plus, doesn't it vent the vapors upon startup? I thought I read that somewhere. So merely getting rid of it and having it vent on its own is really the same thing, isn't it?
The vent in the charcoal canister is a liquid vent. It's an emergency option only...

On startup, vapours are drawn out of the canister and introduced into the intake of the car. Thus, they get burned by the engine.

The fuel system is supposed to be very closed. The oil atmospheric connection to the fuel system is the vent in the fuel cap, which opens under vacuum.
Old 06-22-04 | 04:47 PM
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I believe the vent is through the check-and-cut valve, not the gas cap itself, but that's just my interpretation:

http://www.geocities.com/huguesdc1/evapcrank.html

hugues -
Old 06-22-04 | 07:38 PM
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So, Basicly you need the charcoal canister.
Old 06-22-04 | 07:55 PM
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It's an opinion. Some people think so, some, like me, do not. Search for charcoal canister, plenty of people have taken theirs out without any problems, and have run it like that for a while.
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