Engine Controls - Tests W/O Codes - EEC: Symptoms: Backfires

Check for vacuum leaks.
Check ignition system. See F - EEC BASIC TESTING article in the ENGINE PERFORMANCE Section.
Check engine compression. Check engine mechanical condition. Check intake manifold, manifold gasket, camshaft and valves.
Perform QUICK TEST. See G - EEC TESTS W/CODES article in the ENGINE PERFORMANCE Section.
Check for restricted exhaust system.
Check fuel delivery system. See I - EEC SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.