Symptom Diagnosis

Symptom checks cannot be used properly unless the problem occurs while the vehicle is being tested. To reduce diagnostic time, ensure steps in BASIC DIAGNOSTIC PROCEDURES and appropriate SELF-DIAGNOSTICS articles were performed before diagnosing a symptom. Symptoms available for diagnosis include:

• DIFFICULT OR NO START (CRANKS OKAY) 
• ENGINE STALLS 
• ENGINE MISFIRES OR HAS LACK OF POWER 
• ROUGH OR UNSTABLE IDLE 
• ENGINE HESITATES 
• ENGINE SURGES 
• SPARK KNOCK/DETONATION 
• POOR FUEL MILEAGE 
• OVERHEATING 
• OVER-COOLING 
• EXCESSIVE OIL CONSUMPTION 
• ABNORMAL NOISE OR KNOCKING