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Intermittent System Problems
- Using a spark tester or modified spark plug, check for spark at 2 spark plug wires. If no spark results, see System Testing. If spark is noted on one or both wires, check for dwell increase from low to high RPM.
- Check pick-up coil with ohmmeter leads attached to Green and White wires, removed from HEI module. If reading does not indicate between 500-1500 ohms, replace pick-up coil. If pick-up coil reading was satisfactory, and dwell did not increase, replace electronic module.
- If pick-up coil was satisfactory, but dwell increased, check fuel, spark plug wires, distributor cap, rotor or spark plugs.