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 in the ENGINE PERFORMANCE section and TESTS W/CODES article in the ENGINE PERFORMANCE section were performed before diagnosing a symptom. Following symptoms are available for diagnosis.

• Cranks Normally But Will Not Start
• Cranks Normally But Difficult To Start
• Rough Or Unstable Idle
• High Idle After Warm Up
• Engine Stalls On Deceleration
• Engine Stalls Intermittently
• Engine Hesitates Or Stumbles On Acceleration
• Engine Surges While Cruising
• Lack Of Power
• Engine Runs Rough On Deceleration
• Abnormal Noise Or Knocking
• Fuel Odor
• Excessive Oil Consumption
• Poor Fuel Mileage
• Malfunction Indictor Light (MIL) Always On
• Malfunction Indictor Light (MIL) Never On