Trouble Shooting: Symptoms: Detonation
- Check for overheating problem. Check ignition timing. Check EGR operation. Check transmission Torque Converter Clutch (TCC) and Electronic Spark Control (ESC) operation. Check for improper fuel octane rating.
- Check fuel pressure. See appropriate A-7 FUEL SYSTEM DIAGNOSIS CHART in COMPUTERIZED ENGINE CONTROL section. Check PROM or MEM-CAL for proper application. Check P/N switch input to ECM (if equipped).