Symptom Diagnosis

Symptom checks cannot be used unless a problem occurs while vehicle is being tested. To reduce diagnostic time, ensure steps in the BASIC TESTING and TESTS W/CODES articles were performed before diagnosing a symptom.

Following symptoms are available for diagnosis.

• Difficult To Start/No Start (Cranks Okay)
• Rough Or Unstable Idle
• Engine Hesitates Or Poor Acceleration
• Engine Surges
• Detonation Or Knocking
• Poor Fuel Mileage