Symptom Diagnosis

Symptom checks cannot be used properly unless problem occurs while vehicle is being tested. To reduce diagnostic time, ensure BASIC DIAGNOSTIC PROCEDURES in BASIC TESTING article and SELF-DIAGNOSTICS in TESTS W/CODES article were performed before diagnosing a symptom. The following symptoms are available for diagnosis.

• Backfire
• Engine Stalls
• Engine Stalls Under Acceleration/Deceleration
• Engine Stalls Under Heavy Electrical Load
• Engine Run-On (Dieseling)
• Excessive Fuel Consumption
• Hard Start/Will Not Start
• Hesitation, Flat Spot Or Surge
• High Idle (No Return To Idle)
• Hunting
• Lack Of Power
• Rough Idle
• Spark Knock (Pinging)
• Surge
• Unstable Idle