Symptom Diagnosis

Symptom checks cannot be used properly unless problem occurs while vehicle is being tested. To reduce diagnostic time, ensure steps in BASIC TESTING and TESTS W/CODES articles in the ENGINE PERFORMANCE Section were performed before diagnosing a symptom. Symptoms available for diagnosis include the following:

• Difficult To Start Or No Start - Cold, Normal, Or Hot
• High Idle - Warm
• Rough Or Unstable Idle - Cold Or Hot
• Engine Hesitates Or Misses - Cold, Normal, Or Hot
• Engine Stalls - Cold, Hot, Momentary Acceleration, After Deceleration, Acceleration Or Cruising, Heavy Electrical Load, Or While Turning
• Engine Lacks Power Or Stumbles
• Engine Knocks
• Engine Surges
• Backfire - Intake Or Exhaust