P1297 – Fuel System Out of Balance
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Symptoms
- Rough idle
- Misfires
- Loss of power
- Uneven fuel trims
- Check engine light
Causes
- Injector flow variation
- Vacuum leak on one bank
- Fuel pressure distribution issue
- MAF error
- Exhaust leak
Diagnosis
- Compare bank fuel trims
- Perform injector balance test
- Smoke test intake
- Check MAF readings
- Inspect exhaust for leaks
Repair
- Service or replace injectors
- Repair vacuum leaks
- Correct fuel pressure issues
- Clean or replace MAF
- Repair exhaust leaks