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 TESTING and TESTS W/CODES articles in the ENGINE PERFORMANCE Section were performed before diagnosing a symptom. Symptoms available for diagnosis include:

• Difficult Or No Start (Cranks Okay)
• Engine Misfires Or Has Lack Of Power
• Rough Or Unstable Idle
• Engine Hesitates
• Engine Surges
• Spark Knock/Detonation
• Poor Fuel Mileage
• Fails Emission Test
• Overheating