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 diagnostic procedures in the BASIC TESTING article and self-diagnostics steps in the TESTS W/CODES articles were performed before diagnosing a symptom. Symptoms available for diagnosis include following:

• Difficult To Start
• Surges Or Chuggles
• Lack Of Power, Sluggish Or Spongy Symptom
• Spark Knock/Detonation
• Hesitation, Sag Or Stumble
• Cuts Out Or Misses
• Poor Fuel Mileage
• Stalling, Rough, Unstable Or Incorrect Idle
• Excessive Exhaust Emissions Or Odors
• Backfire
• Dieseling (Run-On)