Symptom Diagnosis: Notes

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

• Visual Check
• No Start - Engine Cranks Okay
• No Start - Engine Cranks & Spark Occurs
• Hard Start - Cold
• Hard Start - Hot
• Stall After Start - Cold
• Stall After Start - Hot
• Hesitation, Sag, Stumble
• Surges And/Or Chuggle
• Lacks Power, Sluggish
• Backfire
• Misses
• Cuts Out
• Rough, Unstable Idle, Stalling
• Won't Idle
• Poor Fuel Economy
• Dieseling, Run-On
• Detonation/Spark Knock
• Excessive Exhaust Emissions