Chart 9
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2015 Lincoln Navigator, 2015 Lincoln MKZ, 2015 Lincoln MKX, 2015 Lincoln MKT, and 2015 Lincoln MKS. However, it is still accessible from the selected car via links, so may be relevant.
- 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.
| SYSTEM/COMPONENT | REFERENCE (Pinpoint Test unless noted) |
|---|---|
| Cooling System | Verify the engine operates at normal temperature. REFER to the service information , Engine Cooling, The Engine Overheats 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 service information , Engine Cooling, Cooling System Draining, Filling and Bleeding for correct coolant concentrations and fill procedures. |
| Mass Airflow (MAF) Sensor | GO to Pinpoint Test DC . |
| Base Engine | REFER to the service information , Engine System, Diagnosis and Testing to continue diagnosis. |
| Fuel Delivery System | GO to Pinpoint Test HC . |
| Secondary Ignition System | For Fiesta 1.6L TIVCT, GO to Pinpoint Test JC
. For all others, GO to Pinpoint Test JB . |
| Positive Crankcase Ventilation (PCV) System | GO to Pinpoint Test HG . |
| Engine Oil Quality | Visual. |
| Additional Testing | GO to Pinpoint Test Z . |