Chart 9
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
Spark Knock
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Verify engine operates at normal temperature | Visual (refer to STEP 2: NO DTC(S) PRESENT SYMPTOM CHART INDEX or the appropriate ENGINE COOLING article, to diagnose any cooling system concerns that are present). |
| Verify correct coolant level and coolant concentration | Refer to the appropriate ENGINE COOLING article for proper fill concentrations and fill procedures. |
| Mass Air Flow (MAF) Sensor | GO to C: Mass Air Flow Sensor STEP DC25. |
| Base Engine | Engine System - Refer to the appropriate ENGINE article. |
| Fuel Delivery System | Natural Gas Applications: GO to B: Natural Gas Fuel Delivery System STEP HB1. All Others: GO to C: Fuel Delivery System STEP HC1. |
| 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 G: Positive Crankcase Ventilation (PCV) System STEP HG1. |
| Engine Oil Quality | Visual |
| Additional Testing | GO to Z: Intermittent STEP Z1. |