datsunranger

Turns out the secondary throttle plate had been sticking the slightest bit open because of some dirt build up and the dizzy vac line had a pretty big crack in it. Cleaned and replaced the vac line now the trucks all back to normal, idles at 800rpm well, pulls about 21 of vac. Thanks for your help, without a FSM or a lot of carb experience, Ratsun can be very helpful.

Thanks for all the info, my friend is going to bring the truck over tonight and i'll take a look at it. Hopefully its something simple i overlooked.

I did check the throttle cable, it wasnt the problem. I didnt check timing though, it looked like it hadnt been touched since 81, so i figured it was good. Not to mention it still has to pass smog so i figured it was close to spec, since they check that and it passed not to long ago. Anyone have the vac specs?

Hi, new to the site and to the datsun 720, but my friend asked me to fix his 81 720. Found out he had a bad head gasket, replaced that without a hitch, but the truck idles high. Maybe around 1100 or so, i tried looking into the idle adjustment screw but it didnt do a thing, the fast idle cam(think thats what its called, sorry not a carb guy) looked like it operated perfectly, and the choke opened as it warmed up. Is there anything you guys can think of to check or mess with, the truck has plenty of power now, cleaned the valves and head up, but the idle things pretty annoying. Thanks for any help you can give me