C 10 1/2 Ton Pickup 2WD V8-379 6.2L DSL VIN C FI (1982)
Glow Plug: Testing and Inspection
Glow Plug Resistance Check
1982
1. Use Kent-Moore High Impedance Digital Multimeter (J-29125) for resistance measurements.
2. Select scales as follows: LH switch to "OHMS," RH switch to full counterclockwise, "200 OHMS," slide center switch to left "DC.LO."
3. Start engine, turn on heater and allow engine to warm up. Remove all feed wires from glow plugs.
4. Turn engine idle speed screw on side of injector pump to worst engine idle roughness. Do not exceed 900 RPM. Allow engine to run for a
minimum of one minutes.
5. Attach alligator clip to black test lead of multimeter and grounded to engine lift strap on left hand side of intake manifold.
6. Probe each glow plug terminal and record resistance values on each cylinder in firing sequence (1-8-7-2-6-5-4-3) with engine idling. Readings
should be between 1.8 and 3.4 OHMS. If these readings are not obtained, turn engine off for several minutes and recheck glow plugs. Resistance
should be .7---.9 OHMS. Readings of 1.2---1.3 OHMS would indicate an engine mechanical problem.
