Spark Knock

WARNING: This page is about a different car, the 2002 Ford Pickup and 2002 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If the following tests fail to correct spark knock concern, it is recommended that owner changes source of fuel. For CNG models, ensure proper grade of fuel is being used.

Check cooling system for overheating. If cooling system is overheating, repair as necessary. See appropriate ELECTRIC COOLING FANS article in ENGINE COOLING.
Check engine mechanical condition. Check compression, camshaft, valve train components, etc. and repair as necessary. See appropriate article in ENGINES.
Check fuel delivery system. See TEST HC: FUEL DELIVERY SYSTEM under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - BI-FUEL article.
Check secondary ignition system. See TEST JB: SECONDARY IGNITION under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article.
Check Knock Sensor (KS). See TEST DG: KNOCK SENSOR under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article.
Check PCV system. See TEST HG: PCV SYSTEM under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article.
Visually inspect engine oil quality. Replace if necessary.
Check Mass Air Flow (MAF) sensor and related circuits. See TEST DC: MASS AIRFLOW SENSOR under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article.