Question
How to diagnose engine misfires caused by faulty ignition coils in direct-injection engines?
Answer
Monitor cylinder misfire counts and test coil primary/secondary resistance.
Explain
Direct-injection engines (e.g., Ford EcoBoost) stress ignition coils. CHEPQ scanners track misfire counts per cylinder and multimeters test primary resistance (0.5-1.5Ω) and secondary resistance (8-15kΩ)—replacing faulty coils restores combustion efficiency and reduces emissions.
Related Diagnostic Guide
To explore this topic in a broader system-level diagnostic context:
Related Guide: OBD-II, DTC & Live Data Analysis
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