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:

Hard Starting (Cranks Okay)
Engine Surges
Lack Of Power, Sluggish Or Spongy
Detonation/Spark Knock
Hesitation, Sag Or Stumble
Cuts Out, Misses
Rough, Unstable Or Incorrect Idle
Poor Fuel Economy
Excessive Exhaust Emissions
Engine Diesels
Engine Backfires

NOTE: Systems and components listed under each symptom may not be applicable on all models.