Subaru Legacy misfire in cylinders 1, 3, and 6 causing the car not to run on Subaru Legacy

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Subaru Legacy owners report experiencing misfires in cylinders 1, 3, and 6, resulting in the vehicle not running properly. These misfires may be attributed to issues with the ignition system, including faulty spark plugs, ignition coils, or spark plug wires. To diagnose the problem, some owners suggest swapping ignition parts between affected and unaffected cylinders to see if the misfire follows the parts. Additionally, consulting a professional mechanic for diagnostic tests on spark plugs, fuel injectors, and ignition components is crucial for identifying the root cause. Monitoring misfire counters and systematically checking spark plug wires can also help pinpoint problematic components. If worn spark plugs are identified, replacing them with suitable replacements may resolve the misfire issues and restore the vehicle's performance.

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