Cylinder 8 Combustion Performance

Check these first

• A worn spark plug or plug wire on cylinder 8
• A dirty or failing fuel injector on cylinder 8
• A weak ignition coil on cylinder 8
• Low compression on cylinder 8
• A vacuum leak at the cylinder 8 intake runner

What to do next

1. Swap the cylinder 8 coil and plug with a known good cylinder
2. Run a compression test on cylinder 8
3. Test the cylinder 8 injector for flow and spray pattern
4. Smoke test the intake runner for cylinder 8
5. Check fuel pressure at the rail
6. Clear the code and retest

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