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 appropriate BASIC DIAGNOSTIC PROCEDURES and TESTS W/CODES articles are performed before diagnosing a symptom. Symptoms available for diagnosis are as follows:

• No Start Or Hard Start
• Starts But Stalls
• Hard To Start - Cold Engine
• Erratic Idle Or Surging
• Backfiring
• Incorrect Idle Speed
• Hesitation - Acceleration
• Knocking
• Engine Misfire - All Conditions
• Insufficient Engine Power
• Poor Fuel Economy
• Excessive HC & CO