Spark Knock
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 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 under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (BI-FUEL) article.
- Check secondary ignition system. See TEST JB under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.
- Check Knock Sensor (KS). See TEST DG under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.
- Check PCV system. See TEST HG under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.
- Visually inspect engine oil quality. Replace if necessary.
- Check Mass Air Flow (MAF) sensor. See TEST DC under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.