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 BASIC TESTING and TESTS W/CODES articles were performed before diagnosing a symptom. Recommended system and component checks may not apply to all vehicles. Symptoms available for diagnosis include the following.

• Engine Will Not Start
• Difficult Cold Start
• Fast Idle Out Of Specification
• Rough Idle When Warm
• Idle RPM High When Warm
• Idle RPM Low When Warm
• Stalling During Warm-Up
• Stalling After Warm-Up
• Misfire Or Rough Operation
• Emission Test Failure
• Lack Of Power