Dodge Omni/Horizon/Rampage 1978-1989 Repair Guide

Electric Choke System



An electric heater and switch are sealed within the choke system, with electricity supplied from the oil pressure sending unit. A minimum of 4 psi (28 kPa) oil pressure is required to close the contacts and send current to the choke control switch.

Click image to see an enlarged view

Fig. Fig. 1 The electric choke heater unit is positioned on the side of the carburetor

The electric choke unit is located on the side of the carburetor. The initial setting is made by the manufacturer, but it is adjustable. The thermostat housing mark is positioned opposite a specified reference line on the black plastic adapter, after which, the three screws are tightened. No normal service of this system is required, but if, for any reason, the three retaining screws are loosened, the adjustment must be made again.

If the choke is removed, be careful you don't lose the small plastic bushing located between the thermostat loop and pin.


The choke heater can be tested by applying 12 volts at the connection. The choke valve should reach the fully open position within 5 minutes, when the vehicle is parked.

Do not operate the engine with a loss of power to the choke. This will cause a very rich mixture and result in abnormally high exhaust temperatures.