Symptom Diagnosis

Symptom checks cannot be used properly unless problem occurs while vehicle is being tested. To reduce diagnostic time, ensure steps in BASIC TESTING and TESTS W/CODES articles in the ENGINE PERFORMANCE Section were performed before diagnosing a symptom. Following are some symptoms available for diagnosis.

• Engine Does Not Operate Smoothly Or Misfires At High Speed
• Engine Fails To Start, No Spark At Plugs
• Engine Backfires, Fails To Start
• Engine Continues To Run With Key Off
• Engine Runs Only With Key In Start Position
• Excessive Fuel Consumption
• Intermittent Spark