Cylinder 7 Injector B Air-Fuel Ratio Imbalance

Where it lives

For P23F8, start at the injector the description names. The description of P23F8 puts it on cylinder 7.

Check these first

• Clogged injector B spray pattern on cylinder 7
• Faulty fuel pressure regulator cutting pressure
• Contaminated or stale fuel reaching cylinder 7
• Cracked injector B body or bad seal on cylinder 7

What to do next

1. Log cylinder 7 misfire counts and fuel trims
2. Test fuel pressure and regulator operation
3. Swap cylinder 7 injector B with a known-good unit
4. Inspect the cylinder 7 injector B seal and body for leaks
5. Replace cylinder 7 injector B if flow is off
6. Clear the code and retest

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