BobBrumby Posted April 2, 2004 Share Posted April 2, 2004 I have a line runnin from the front of the carb that is about 6 inches long that goes to nothing. The place where the tube connects onto the carb is near to this hexagonal prism with a wire coming from it that screws into the carb. And is possioned on the front of the carb(closest to the radator) and rather high up on it. When I put my finger over the tube when the car is running it increases its idle by about 100-150 rmp. I also blew into the tube and could hear a hissing sound from inside the carb (i think). Could anyone tell what this line mite do or way to find out? Any help would be great. And I could take a photo tomorow if that would help identify it. Quote Link to comment Share on other sites More sharing options...
Snowman Posted April 2, 2004 Share Posted April 2, 2004 A picture would be invaluable in determining what this is, at least for me. Quote Link to comment Share on other sites More sharing options...
Turbone Posted April 2, 2004 Share Posted April 2, 2004 I looked in the 84 FSM, and it shows 2 lines in front and both are vacume lines. Try hooking it up to the intake manifold. Maybe look around for a open port on the intake manifold. If it doesnt run good, it may have to go to the air cleaner. There are a couple of fitting on the underside of the aircleaner base that have lines from the carb/manifold. The book has 4 to 5 different applications for the US market. The hexagon shaped object is the anti-dieseling switch. Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted April 2, 2004 Author Share Posted April 2, 2004 All pictures taken from infront of car with the air cleaner pushed back. The offending line is only marked on the first pic. Quote Link to comment Share on other sites More sharing options...
Aldoat Posted April 2, 2004 Share Posted April 2, 2004 That line is supposed to connect to a GREEN T-fitting just like the one pictured at the top of the pic. There are two of those. It connects to the mid port on the T and one of the cross ports is capped off. The other T fitting hase both cross ports connected to medium/large hoses and the mid port is connected to the small hose from the air cleaner Idle Compensator (valve on right side of air cleaner as you look at it from front of engine). Went outside and looked at my 86 EA81 Brat. Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted April 3, 2004 Author Share Posted April 3, 2004 Aldoat on mine both the green t pieces are on tubes that goto air control valve, one t peice is complety blocked (one in pic u refered to) cept the line running to air control valve and the other runs from carbi to air control valve with the extra fitting blocked. This seems to be a little diff from what u described as none of em goto the air cleaner valve. Yeh the air preheat has removed cause its never cold enough here if this has anything to do wif it. Should i plug this line on the carb or is it not doing any harm leaving it in the open air? You have goto love previous owners Quote Link to comment Share on other sites More sharing options...
Aldoat Posted April 3, 2004 Share Posted April 3, 2004 Too dark and rainy out now to check so will look tomorrow. Will try to move my lines into view and maybe post a pic. And yes, you gotta luv previous owners:-\ . Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted April 4, 2004 Author Share Posted April 4, 2004 Dam i also hate time zones cause while I am awake u guys are sleeping, anyway. oi Snowman did those pictures help you any and yeh thanks Aldoat that would be great Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted April 4, 2004 Share Posted April 4, 2004 You can safely just plug that sucker. I've got that line plugged on my Brat. It's part of the vacuum system for the evaporative emmissions system. I would just plug the port, and forget about it. The RPM increase is because you are "fixing" your vac leak when you plug it off. GD Quote Link to comment Share on other sites More sharing options...
subiemech85 Posted April 4, 2004 Share Posted April 4, 2004 on the 84 carb california emissions computer feedback model, it went to a big controller with 2 wires and other lines connected to it, by the pcv and egr valves Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted April 4, 2004 Author Share Posted April 4, 2004 It's part of the vacuum system for the evaporative emmissions system. GD The charcoal canister's retun into the intake manifold? or?? Quote Link to comment Share on other sites More sharing options...
Aldoat Posted April 4, 2004 Share Posted April 4, 2004 OK, wasn't able to get pics but that line goes to a T-connector that also runs to the black vac valve that sits over the driver side Air suction Valve. It's all part of the emmissions system. Cap it off if you don't have to worry about passing emmissions/under hood inspection. I have emmissions testing here in NJ so I still have everything hooked up. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted April 4, 2004 Share Posted April 4, 2004 The charcoal canister's retun into the intake manifold? Technically known as the purge line. Not sure if that's the one, but it's certainly part of that system. There's a thermo-vacuum valve in there somewhere that won't allow the gasses from the evap can to get out till the engine reaches operating temp, thus all the nasty routing of vac lines, and crap going everywhere. You can figure it all out in your head if you stare at it long enough. Basically, you have three vent lines - on from the gas tank, one from the float bowl, and one from the "vapor seperator" on the front fuel filter. These all go into the evap can, and get trapped there when the car is sitting in a hot parking lot. Once the engine is started, and warmed up, the thermo-vacuum valve(s) open, and let the vapor back into the intake to be burnt..... Basically it's all bullsh!z - just pull out the charcoal canistor too, and get rid of all those silly hard lines that go with it. Leave the gas tank vented to the air, and route the float bowl vent to the air filter houseing. Remove that silly expensive fuel filter with it's fancy vapor seperator and replace it with a $1.49 clear model from the parts counter. And guess what - it won't impact your emmissions test in the slightest. If you do a good job, they will never know you removed anything, and none of this can be detected with a tail-pipe test.... GD Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted April 4, 2004 Author Share Posted April 4, 2004 well we dont even have tail pipe tests over here Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted April 4, 2004 Share Posted April 4, 2004 Sweet - just rip it all out then. Basically, you can plug off the Air injection valves with quarters (US currency - maybe you have somethign that size? hehe). And the rest can go away. All you have to leave on the carb, is fuel inlet and return lines, the bowl vent line, and the vacuum lines for the ERG valve, the vac advance on the disty, and the secondary barrel and or choke pull-off if you have them. Plug EVERYTHING else, and you'll be good. GD Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted April 4, 2004 Author Share Posted April 4, 2004 Is the egr valve under the alternator cause i have never seen one cept a black and white photo in manual. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted April 4, 2004 Share Posted April 4, 2004 Is the egr valve under the alternator cause i have never seen one cept a black and white photo in manual. EGR is on the back of the manifold - right behind the carb - it's a big 3" metal canistor with a vacuum line running into it. It's gold in color usually. HINT: use NEW soft vacuum line to run to both the EGR, and the disty vac advance - the hard lines used to connect everything are suspect since they run into all the other places that vacuum is supposed to go...... places you are disconnecting. Useing them is just asking for a leak. GD Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted April 4, 2004 Author Share Posted April 4, 2004 the hard lines used to connect everything are suspect since they run into all the other places that vacuum is supposed to go...... GD So i should use one of the vacant vac ports ontop of the inlet manifold similar to the brake booster but smaller for the distrib. and egr? Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted April 4, 2004 Share Posted April 4, 2004 No - the disty and EGR both have special ports near the bottom of the front of the carb (right above the pinned-off idle mixture screw). They go into the maze of hard lines right now - you will re-route them. And it does matter which ones goes where - but I can't recall at the moment which is which. A little experimentation and you should be able to figure it out tho. GD Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted April 4, 2004 Author Share Posted April 4, 2004 No - the disty and EGR both have special ports near the bottom of the front of the carb GD Do you mean the hardlines under the carb or actually on the bottom of the carb? Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted April 4, 2004 Share Posted April 4, 2004 ON the carb - the stuff under the manifold is crap - remove it if you want (have to reomve the manifold tho). GD Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted April 4, 2004 Author Share Posted April 4, 2004 My distributer is curently connected to one of those hardlines under the manifold. Were those last posts a suggestion if I de`emission or what it should be? Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted April 4, 2004 Author Share Posted April 4, 2004 ah i tkink i got it, i noticed those two lines running to carb b4. so i can just follow one these back allong the hardline and i should come to where the distrib is plugged in? Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted April 4, 2004 Share Posted April 4, 2004 Yeah - more or less. The hard lines are very confusing, since they split and branch all over the place. Hard to tell what does what. I would blow air into the disty tube, and see where it comes out.... same with the ERG. GD Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted April 4, 2004 Author Share Posted April 4, 2004 When I de'emission will I need to remove the 3 port thermal vaccum, two port thermal vaccum valve, the air control valve and the vavuum valve completely? Or can I leave these in untill I get the time to remove them? Also I never have never heard weather to remove the coasting bypass of leave it in. Abither Q: the vapour seperatour from the front fuel filter is t`ed onto the fuel return line which then goes thru the firewall. Did not you say that that line should be t`ed onto the fuel tank vapour line? Quote Link to comment Share on other sites More sharing options...
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