Before going to FI..Toyota had O2 sensors and carbs...and all those other goodies on Tercel engines up to '88.

With these cars several people with poor mileage have found that the vac advance diaphrams on the dist were leaking...not allowing the right vac advance. Also helps to redo ALL the vac lines...or at least redo the ends. EBCV?

For the Tercel there is no diagnostic...you just have to check each component.

Some just put a Weber on the car.