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

Check listed items as follows:

• Check powertrain control module power and ground circuits. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
• Check fuel pressure. See CHECKING FUEL DELIVERY under FUEL SYSTEMS in appropriate BASIC DIAGNOSTIC PROCEDURES article.
• Check manifold absolute pressure sensor. See MANIFOLD ABSOLUTE PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in appropriate SYSTEM & COMPONENT TESTING article.