Topic: 82 toyota 22r 4x4 vacuum advance

[desrodunes1]

can someone tell me if both ports on the vacuum cannister on the distributor are suppose to hold vacuum? the one closest to the the valve cover does not and the one closest to the radiator does. the mechanical advance works Im just wondering if I need to change out the cannister? thx Mike

[jarmumd]

Typically the port closest to the block is for the High Altitude Control (HAC) to advance the timing due to lower air pressure.  It doesn't do anything below I think 5000 ft.  The other port (close to your radiator) is your typical vacuum advance port.

[austintaco]

Typically the port closest to the block is for the High Altitude Control (HAC) to advance the timing due to lower air pressure.  It doesn't do anything below I think 5000 ft.  The other port (close to your radiator) is your typical vacuum advance port.

If you have them both connected to a "y" and running into the same port on your carb ( I have a Weber 38 ), will that just advance the timing more?