Symptoms Diagnosis
WARNING: This page is about a different variant/trim than selected.
Symptom checks cannot be used properly unless problem occurs while vehicle is being tested. To reduce diagnostic time, ensure BASIC DIAGNOSTIC PROCEDURES in the BASIC TESTING - 4.0L and SELF-DIAGNOSTICS TESTS in the TESTS W/CODES - 4.0L articles 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
- Fuel Pump Always On
- Gas Smell
- Sulfur Smell
- Engine Noise
- Vibration
- Climate Control (Lack Of Cooling)
- Climate Control (A/C Always On)
- A/C Does Not Go Off During WOT