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 TESTING and TESTS W/CODES articles were performed before diagnosing a symptom. See articles;

• Basic tests, see: BASIC TESTING
• Diagnostic code tests, see: TESTS W/CODES

Symptoms available for diagnosis include:

• Engine Does Not Start (Will Not Crank)
• Engine Cranks, But Fails To Start
• Engine Backfires
• Loss Of Power
• Detonation (Engine Knock)
• Stalls At Idle
• Engine Runs Rough (Off Idle)
• Rough Or Unstable Idle
• Engine Misfires - All Conditions
• Poor Fuel Economy
• Excessive Emissions