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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Engine Controls - Basic Testing) >> C-4, Basic Ignition System Checks (Gasoline) >> HEI-Est Distributor >> Distributor Pick-Up Coil Short & Resistance Checks

Distributor Pick-Up Coil Short & Resistance Checks

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  1. Disconnect pick-up coil leads from HEI-EST module terminals "N" and "P". Set ohmmeter to middle scale, and connect one lead to either pick-up coil lead and other lead to distributor housing. See Fig 1. Flex pick-up coil leads by hand to check for intermittent shorts to ground. If reading is not always infinite, replace pick-up coil.
  2. Connect ohmmeter between both pick-up coil leads. Check for intermittent opens by flexing wires and connectors. If resistance is not 500-1500 ohms, replace pick-up coil.
Fig 1: Checking Distributor Pick-Up Coil
G90J15783Courtesy of GENERAL MOTORS CORP.
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