LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1989 >> Forward Control 3.9 L, Standard >> Repair and Diagnosis >> Engine Performance >> Ignition System - HEI/Est/ESC >> Component Testing >> Capacitor (HEI)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Capacitor (HEI)

The capacitor is used for radio noise suppression. Set ohmmeter at x1000 scale. Disconnect capacitor. Touch ohmmeter leads to capacitor terminal and ground. Slight needle movement will occur rapidly and return to infinity. A continuous reading other than infinity indicates defective capacitor.