Chart 9
- Spark Knock
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|---|
| Verify the engine operates at normal temperature | Visual. REFER to ENGINE COOLING or the Symptom Index, to diagnose any cooling system concerns that are present. |
| Verify correct coolant level and coolant concentration | REFER to ENGINE COOLING for proper coolant concentrations and fill procedures. |
| Mass Air Flow (MAF) Sensor | GO to C: Mass Air Flow (MAF) Sensor STEP DC26. |
| Base Engine | REFER to ENGINE . |
| 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 . |