Engine Controls - Trouble Shooting - No Codes: Symptoms: Backfire

Check listed items in order as follows:

• Check PCM power and ground circuits. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - DAKOTA & DURANGO article.
• Check fuel pressure. See FUEL PRESSURE TEST under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - DAKOTA & DURANGO article.
• Check Manifold Absolute Pressure (MAP) sensor. See MANIFOLD ABSOLUTE PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - DAKOTA & DURANGO article.
• Check minimum idle airflow. See MINIMUM IDLE AIRFLOW under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - DAKOTA & DURANGO article.