I just put a new carb on my '86' GL. Since the car is old enough that I don't have to go through the emissions stuff I've tried to disconnect all the emissions stuff and plug them. It doesn't idle too pretty good, ( a bit rough) and has to be set at about about 1000 + rpms or it dies. And at that, it vacillates between 900 and 1200 rpms. I played with the timing but nothing changed. It runs like it has a vacuum leak but I've sprayed starter fluid all around in there and there's no change in the rpms. My thinking is based on if I was putting a Weber carb in, none of the emissions stuff would be connected to it. It seems to run fine when I'm driving, it's just the idle that's humbug. Did I miss something or is it not possible to disconnect the emissions stuff and have the car run right? What can I disconnect and what do I have to leave hooked up?

Probably best to get a Weber, if you a Hitachi, those are far from anything bad, they are worse. Best of luck

Yes, but while you obtain a Weber...

 

There are three things that you can do, that might Help a lot:

 

• Adjust the Idle Speed screw to let it idle a little Fast: 1,000 RPMs.
• Adjust the Air/Fuel mixture screw, until it revs easier, without hesitation and RPM's will increase. Then after that is achieved, turn back the RPM's to +/- 800.
• Erase the vacuum activated secondary (High) Stage, and make it Mechanical.

If the idle continues being erratic, the Carburetor might be Dirty and I suggest a good Cleansing.

 

Doing such things will improve the idle, but also the Response during Acceleration, here is an easy guide with Video, regarding how to make Mechanical, a vacuum operated Carburetor, I hope this ideas will be Helpful for you:

 

~► http://www.ultimatesubaru.org/forum/topic/147163-mechanical-conversion-on-hitachi-carburetors/

 

Kind Regards.

Edited February 4, 201610 yr by Loyale 2.7 Turbo