1985 toyota vaccum advance unit with two ports. all smog stuff is gone which one hooks to the carb.?

i have a weber carb with one port for the vaccum advance. but my vaccum advance unit on the distribitor has two ports. which one hooks to carb. and do i plug the other port or hook it to the intake so it has vaccum.

1985 toyota vaccum advance unit with two ports. all smog stuff is gone which one hooks to the carb.?
You will need a manual vacumm hand pump to test wich one of the 2 ports on your distributor is the advance and wich one is the retard.





Please be very carefull when doing the proposed procedure on your car. Always apply the hand brake and make sure your car won't move. If your car is STD then put it on Neutral. If your car is Automatic Trans. type leave it on Parking. Safety first !!!





Start your car and let it idle by 5 mins or so.





Then attacht the vaccum pump to one port and apply some vaccum. If your car accelerates thats the advance. If by the opposite it seems to slow or even stall, thats the retard.





Connect the advance port to the carburator vaccum advance.





You can leve the other one open of cover it with any rubber just to prevent dirt.
Reply:The other port you can cap it off.





I don't recommend to connect it to the intake unless you know exactly what you are doing.





You can give it too much advance, or you can apply a vaccum to a retard port neutralizing the advance.





So your best bet is cap it off. Report It

Reply:What pedro said, but you can just use the vacuum coming off the hose from the carb.



credot siosse