Symptom Diagnosis

Symptom checks cannot be used properly unless problem occurs while vehicle is being tested. To reduce diagnostic time, ensure steps in appropriate article below were performed before diagnosing a symptom.

• Basic system checks, see: BASIC TESTING
• Trouble Code diagnostics, see: TESTS W/CODES

Symptoms available for diagnosis include:

• No Start - Cold Engine
• Starts But Stalls - Cold Engine
• Hard To Start - Cold Engine
• No Start - Warm Engine
• Erratic Idle - Warm-Up
• Backfiring
• Incorrect Idle Speed
• Hesitation - Acceleration
• Hesitation - Coasting
• Knocking
• Engine Misfire
• Insufficient Engine Power
• Poor Fuel Economy
• Excessive HC and NOx