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Home >> Mercury >> 1982 >> Zephyr Base, 4.2L Eng VIN D >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> MOTORCRAFT Model 2150 2-Barrel >> Testing >> Electric Choke >> Choke Cap Resistance

Choke Cap Resistance

  1. Using a heat source (100 watt bulb), hold close to face of choke cap for 3-5 minutes to heat cap to temperature above internal switching point.
  2. Using an ohmmeter set on 30 ohm (maximum) scale, connect ohmmeter between choke cap terminal and choke cap shroud. Ensure metal-to-metal contact is obtained. Ohm reading should be under 30 ohms, but not 0. If not to specifications, repeat test. If reading is still not to specifications, replace choke cap.
  3. Using a choke tester, cool choke cap by directing cold air towards oval-shaped insulator (not case) around cap terminal. Ohm reading should slowly increase and then a sudden increase (under 10 ohms) should occur.
  4. Stop cooling. The sudden increase (of under 10 ohms) should occur within 10 minutes after cooling began. If resistance change does not occur within 10 minutes, replace choke cap. If resistance does change, warm insulator in same manner as described in step  3).
  5. The ohm reading should vary gradually and then a sudden decrease should occur within 10 minutes that warming began. If decrease does not occur within 10 minutes, replace choke cap. If resistance does change, choke cap is working properly.
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