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 the following articles in this section were performed before diagnosing a symptom:

• BASIC TESTING and
• TESTS W/CODES

Symptoms available for diagnosis include:

• Engine Does Not Start (Fails To Rotate)
• Engine Rotates, But Fails To Start
• Engine Backfires
• Loss Of Power
• Detonation (Engine Knock)
• Engine Fails To Idle
• Engine Runs Rough (Off Idle)
• Rough Or Unstable Idle