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 article in this 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.