Symptom Diagnosis

Symptom checks should not be used unless symptom occurs while vehicle is being tested. To reduce diagnostic time, ensure steps in appropriate BASIC DIAGNOSTIC PROCEDURES and SELF-DIAGNOSTICS articles were performed before diagnosing a symptom. Symptoms available for diagnosis include:

• Cuts Out, Misses 
• Detonation/Spark Knock 
• Engine Backfires 
• Engine Dieseling/Run-On 
• Excessive Exhaust Emissions Or Odors 
• Hard Start 
• Hesitation, Sag Or Stumble 
• Lack Of Power, Sluggish Or Spongy 
• Poor Fuel Economy 
• Poor Fuel Fill Quality 
• Rough, Unstable Or Incorrect Idle, Stalling 
• Vehicle Surges Or Chuggles