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 G - TESTS W/ CODES articles in the ENGINE PERFORMANCE Section were performed before diagnosing a symptom. Symptoms available for diagnosis include the following.

• Difficult To Start
• Surges Or Chuggles
• Lack Of Power Or Sluggish
• Detonation Or Spark Knock
• Hesitation Or Stumble
• Cuts Out Or Misses
• Poor Fuel Mileage
• Rough, Unstable Idle Or Stalls
• Excessive Exhaust Emissions Or Odors
• Runs-On Or Diesels
• Backfires