Question
How to test faulty gasoline engine spark plug wire?
Answer
Measure wire resistance and inspect for insulation damage.
Explain
A faulty spark plug wire causes weak spark and misfires. CHEPQ multimeters test wire resistance (5,000-10,000Ω per foot) and visual inspection identifies cracked insulation—replacing damaged wires ensures strong spark delivery to spark plugs.
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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To apply the diagnostic concepts discussed above in real-world scenarios, explore our full range of professional automotive diagnostic tools. These solutions are designed to support battery testing, system diagnostics, and data analysis for modern vehicles and workshop environments.
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