Mike's Workshop Manuals: Service manuals for every vehicle
Home >> GMC >> 1987 >> Forward Control 6.2 J, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Engine Controls - Basic Testing - Gasoline) >> C-4, Basic Ignition System Checks >> HEI-Est Distributor >> Distributor Pick-Up Coil Short & Resistance Checks

Distributor Pick-Up Coil Short & Resistance Checks

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect pick-up coil leads from module. Using ohmmeter, check pick-up coil resistance. Connect ohmmeter to distributor housing and either pick-up coil lead (step 1 in illustration). See Fig 1. Flex pick-up coil leads by hand to check for intermittent short to ground. If reading is not always infinite, replace pick-up coil.
  2. Connect ohmmeter between pick-up coil leads (step 2 in illustration). See Fig 1. Check for intermittent open by flexing wires and connectors. If resistance is not 500-1500 ohms, replace pick-up coil.
Fig 1: Checking Distributor Pick-Up Coil
G93I76560Courtesy of GENERAL MOTORS CORP.
scientia non olet · About Mike's Workshop Manuals