Cylinder 4 Combustion Performance

Check these first

• A misfiring injector on cylinder 4
• A fouled or worn spark plug on cylinder 4
• A weak ignition coil on cylinder 4
• Low compression on cylinder 4
• A vacuum or intake leak feeding cylinder 4

What to do next

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

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