Symptom Diagnosis
Symptom checks cannot be used properly unless problem occurs while vehicle is being tested. To reduce diagnostic time, ensure steps in BASIC TESTING and TESTS W/CODES articles below were performed before diagnosing a symptom.
Symptoms available for diagnosis include the following:
- Hard Starting (Cranks Okay)
- Engine Surges And/Or Chuggles
- 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 Or Odors
- Engine Diesels, Runs On
- Engine Backfires
NOTE:
Systems and components listed under each symptom may not be applicable on all models.