Detonation/Spark Knock: Vitara
- Engine overheating. See engine overheating related DTCs in appropriate SELF-DIAGNOSTICS article.
- Faulty spark plugs. See IGNITION CHECKS in BASIC DIAGNOSTIC PROCEDURES article.
- Improper ignition timing. Check ignition timing. See IGNITION TIMING in ON-VEHICLE ADJUSTMENTS article.
- Fuel pressure out of specification. See FUEL PRESSURE under FUEL SYSTEM in SYSTEM & COMPONENT TESTING article.
- Faulty Knock Sensor (KS). See KS related DTCs in appropriate SELF-DIAGNOSTICS article.
- Faulty fuel injector(s). See B-2: FUEL INJECTOR CIRCUIT INSPECTION under CIRCUIT TESTS in BASIC DIAGNOSTIC PROCEDURES article.
- Exhaust Gas Recirculation (EGR) system malfunction. See EGR valve related DTCs in appropriate SELF-DIAGNOSTICS article.
- Excessive carbon deposits in combustion chambers. Clean combustion chambers as necessary.