Choke won't close all the way down
I'm not exactly sure about the 1987 toyota choke, but the basic concept of a choke is that the butterfly(flap in top of the carburetor) needs to close to allow less air and more fuel to enter the intake when the engine is cold. This is acomplished on most carburetors with an electric choke thermostat. The thermostat has a bimetallic spring that is would up and connected to the butterfly through a rod. The bimetallic spring is made of a special allow that expands and contracts as the temperature changes. Usually through a relay of some sort 12v or less is applied to the choke thermostat with the engine running and used to heat the spring therefor releasing tension on the closed butterfly. It sounds like your butterfly is never opening as the engine is warming up, and staying on fast idle. See if there is a wire on the thermostat and remove it and check it with a voltmeter with the car running, there should be >8vDc. If there's voltage then the thermostat is probably faulty(as long as the linkage is ok) If there is no voltage, check the fuses and fuse links and then consult a schematic to see where the voltage is suppiled from/to, could be a faulty relay as well.
Aug 20, 2009 |
1987 Toyota Pickup