Wagoneer L6-258 4.2L VIN C 2-bbl (1982)
Electric Assist Choke: Description and Operation
Fig. 21 Electric Choke Assembly, Except 4-121 & 151 Engines
The electric assist choke reduces carbon monoxide (CO) and hydrocarbon (HC) emissions during warm-up. It provides supplemental heat to the
choke bi-metal to speed up choke valve opening after the choke cover interior reaches a pre-determined temperature.
On this system, Fig. 21, a special tap is provided to the- alternator to supply a 7 volt power supply to the electric assist choke. A thermostatic
switch within the choke cover closes when the interior of the choke cover reaches the modulating temperature. This allows current to flow to the
heating element when the circuit is completed through the choke cover ground strap and choke housing to the engine. As the heating element
becomes hot, heat is absorbed by an attached metal plate which heats the choke bi-metal coil.
When the engine is turned off, the thermostatic switch remains closed until the choke cover interior modulating temperature is reached. If the
engine is started immediately after shut-down and before the modulating temperature is reached, current will immediately begin warming up the
heating element to open the choke. Once the choke cover interior temperature falls below the modulating temperature, the thermostatic switch
opens and current flow to the heating element is shut off. If the engine is restarted at this time, the electric assist function will not operate until
choke cover interior reaches its modulating temperature.
