glsubby Posted August 23, 2020 Share Posted August 23, 2020 Hello, I have a 1985 GL hatchback, EA81, automatic 1.8l with emissions. I just put a Weber 32/36 carb on it (with the EA81 one piece adapter. I’ve plugged every vacuum inlet I can find (except PVC/EGR) and now when I start it it revs to 5k or higher. One day I adjusted the choke to be fully open (butterflies open) and it stayed around 2500. Adjusting the idle speed screw didn’t help. I have checked and adjusted the accelerator cable and I don’t see any linkage issues. please please help. Link to comment Share on other sites More sharing options...
DaveT Posted August 24, 2020 Share Posted August 24, 2020 The choke and fast idle cam work together. The fast idle cam over rides the idle screw. Check the the choke heater and other settings for the choke are correct. Link to comment Share on other sites More sharing options...
Mack Truck Posted August 24, 2020 Share Posted August 24, 2020 do you know if the float is set properly? is the throttle cable allowing the carb to return to where the slow idel screw is on adjustment tab? id check those too. Link to comment Share on other sites More sharing options...
Step-a-toe Posted August 24, 2020 Share Posted August 24, 2020 It is surprising just how many revs you can get from such a minimal opening of the throttle. Looking down primary throat can you see if it is closing properly? Is it a tried and tested Weber or out of the box newy? Had issues with new before with idle screw jet only just holding on ( by some foam packing?) Adaptor correctly seated between inlet and Weber? PCV valve stuck open? Link to comment Share on other sites More sharing options...
glsubby Posted August 24, 2020 Author Share Posted August 24, 2020 The main jet was in all the way so I will back it out two turns. The adapter to intake manifold has jb weld all around it (paranoid of air leaks). The previous owner had put an autobest fuel pump on. I’m trying to get the model number but could too much fuel pressure cause it to high idle? I have a return spring on linkage, looked down the primary with a light and it “looks” closed. Adjusted the choke so the butterflies are closed (maybe I shouldn’t). I did plug the two holes going into the sides of the engine....not sure if that was correct. Thanks in advance! Link to comment Share on other sites More sharing options...
Step-a-toe Posted August 24, 2020 Share Posted August 24, 2020 It was wrong to describe the two holes into side of engine as such - I have no idea what you describe. Plug the PCV Post some well lit photos? Link to comment Share on other sites More sharing options...
glsubby Posted August 24, 2020 Author Share Posted August 24, 2020 Sorry, it’s the two PCV 5/8” circulation inlets, on the blue covers, left and right. Is the pcv essential for a Weber? Some write ups include it and others don’t. Link to comment Share on other sites More sharing options...
DaveT Posted August 25, 2020 Share Posted August 25, 2020 Those PCV ports need to be open. Blow by has to have somewhere to go. Has nothing to do with idle though. The choke should only be fully closed when dead cold and cranking. Once it fires, it should start to open. If it's too closed [or too open] , it won't run well. Once it is up to normal temp, the choke should be wide open. Link to comment Share on other sites More sharing options...
Step-a-toe Posted August 25, 2020 Share Posted August 25, 2020 (edited) Yep, the air in the crankcase needs to exchange with outside world in a filtered way ( combustion ). Make or buy a catch can to run the 5/8" lines to catch can. I use heater hose. Also need to plumb in the PCV valve. Then use a smaller diameter hose in order to fit the Weber carb air filter fitting. I would fit two into air filter base to start to match the original 5/8" flow. So, catch can could have up to 3 of 5/8" fittings and 2 of 3/8 Edited August 25, 2020 by Step-a-toe Link to comment Share on other sites More sharing options...
Step-a-toe Posted August 25, 2020 Share Posted August 25, 2020 (edited) 12 hours ago, glsubby said: The main jet was in all the way so I will back it out two turns. The adapter to intake manifold has jb weld all around it (paranoid of air leaks). The previous owner had put an autobest fuel pump on. I’m trying to get the model number but could too much fuel pressure cause it to high idle? I have a return spring on linkage, looked down the primary with a light and it “looks” closed. Adjusted the choke so the butterflies are closed (maybe I shouldn’t). I did plug the two holes going into the sides of the engine....not sure if that was correct. Thanks in advance! I think you may have "main jet" and idle air adjust screw confused. Maybe it is me confusing with certain Holley 4 bbl ?? A few years since I have played but think main jet is inside and needs top section off to access, change. You have primary barrel your choke sits above, then the secondary barrel that opens mechanically Edited August 25, 2020 by Step-a-toe Link to comment Share on other sites More sharing options...
glsubby Posted August 30, 2020 Author Share Posted August 30, 2020 Solved: new accelerator cable and hitachi carb fuel & fuel return installed. Idles at 800 and I drove it for over an hour. Thank you! 1 Link to comment Share on other sites More sharing options...
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