Symptoms 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 G - EEC-IV TESTS W/CODES articles in the ENGINE PERFORMANCE Section were performed before diagnosing a symptom. Symptom checks are listed in order of probability, ease of accomplishment, and accessibility. Symptoms available for diagnosis are as follows.

• No Crank
• Hard Start/Long Crank
• Stalls After Start
• No Start/Normal Crank
• Slow Return To Idle
• Rough Idle
• High Idle (Diesels/Runs On)
• Low Idle (Stalls On Deceleration)
• Hesitates Or Stalls
• Surge (On Acceleration Or Cruise)
• Backfires
• Loss Of Power
• Spark Knock
• Poor Fuel Economy
• Emissions Compliance
• Warning Indicator Lights
• Improper Transmission Shift
• High Oil Consumption
• Engine Runs Hot
• Engine Runs Cold
• Exhaust Smoke
• Gas Smell
• Engine Noise
• Vibration
• Climate Control (Lack Of Cooling)
• Climate Control (A/C Always On)