Chart 9
- Spark Knock
NOTE:
Carbon Build Up In The Combustion Chamber And On The Back Of Valves Can Be A Contributing Factor For Engine Spark Knock Concerns. Remove Carbon Deposits Prior To Any Component Replacements.
Symptom Chart
| System/Component | Reference ( Pinpoint Tests - Gasoline Models Unless Noted) |
|---|---|
| Verify The Engine Operates At Normal Temperature | Visual. Refer To The Appropriate Cooling System Article Or no Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index To Diagnose Any Cooling System Concerns That Are Present. |
| Verify Correct Coolant Level And Coolant Concentration | Refer To The Appropriate Cooling System Article For Correct Coolant Concentrations And Fill Procedures. |
| Maf Sensor | Go To Pinpoint Test DC . |
| Base Engine | Refer To The Appropriate Engine System Article And Carry Out The Inspection And Verification To Continue Diagnosis. |
| Fuel Delivery System | Go To Pinpoint Test HC . |
| Secondary Ignition System | For Vehicles Equipped With A Coil Pack Ignition System, Go To Pinpoint Test JC
. For All Others, Go To Pinpoint Test JB . |
| PCV System | Go To Pinpoint Test HG . |
| Engine Oil Quality | Visual |
| Additional Testing | Go To Pinpoint Test Z . |