Chart 9
WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Lincoln Navigator L, 2011 Lincoln Navigator, and 2011 Lincoln MKZ. 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.
SYMPTOM CHART - SPARK KNOCK
| SYSTEM/COMPONENT | REFERENCE (Pinpoint Test unless noted) |
|---|---|
| Verify the engine operates at normal temperature | Visual. REFER to the appropriate Engine Cooling 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 Engine Cooling article for correct coolant concentrations and fill procedures. |
| Mass Air Flow (MAF) Sensor | GO to PINPOINT TEST DC . |
| Base Engine | REFER to the appropriate Engine 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 . |
| Positive Crankcase Ventilation (PCV) System | GO to PINPOINT TEST HG . |
| Engine Oil Quality | Visual. |
| Additional Testing | GO to PINPOINT TEST Z . |