Detonation/Spark Knock/Pings

DEFINITION:
A mild to severe knock, that usually occurs under acceleration, The engine produces sharp metallic sounds that change with throttle opening. Generally higher pitched than an engine knock. May be described as a ticking or clatter noise. Occurs when fuel/air charge is ignited by something other than the spark plug.


Check Powertrain System, if not already completed

Check EGR System.

Check Fuel System, looking in particular for:

- Fuel Quality
- Low Octane Level
- Contaminants


- Low Fuel Pressure

- Low Flow Rate Injector


Check Ignition System, looking in particular for:

- Knock Sensor Not Operating Properly



Check for cooling system problems, looking in particular for:

- Overheating Engine
- Depressurized Engine Cooling System
- Restricted Engine Coolant Flow
- Engine Coolant Fans Inoperative


Check for the following mechanical causes:

- Excessive Oil Consumption

- Camshaft Timing

- Intake Valve Deposits

- Engine Knock