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 article and appropriate TESTS W/CODES article were performed before diagnosing a symptom. Following symptoms are available for diagnosis.

• Difficult To Start
• Rough Or Unstable Idle
• Excessive Fast Idle
• Engine Stalls
• Engine Misfires Or Has Lack Of Power
• Engine Runs Rough On Deceleration
• Backfire In Exhaust System
• Poor Fuel Mileage
• Excessive Oil Consumption
• Abnormal Noise Or Knocking
• Fails Emission Test