Cylinder 3 Combustion Performance

Check these first

• A misfiring injector on cylinder 3
• A fouled or worn spark plug on cylinder 3
• A weak ignition coil on cylinder 3
• Low compression on cylinder 3
• A vacuum or intake leak feeding cylinder 3

What to do next

1. Check misfire counters per cylinder on a scan tool
2. Swap the cylinder 3 coil and plug with a neighbor to see if the fault moves
3. Test the cylinder 3 injector for flow and pulse
4. Run a compression test on cylinder 3
5. Smoke test the intake near cylinder 3
6. Clear the code and retest

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