Engine Noise: Knock
- Check for worn rod/main bearings.
- Check for loose piston pins.
- Check piston to cylinder bore clearance.
- Knock (Detonation) - See SPARK KNOCK under SYMPTOMS.
NOTE:
For additional A/C system information, see appropriate article:
For Pickup, see A/C-HEATER SYSTEMS article.
For Van, see A/C-HEATER SYSTEMS article.