Trouble Shooting: Symptoms: Backfire
- Check for loose wiring connector or air duct at MAF sensor. Check EGR valve mounting gasket or faulty valve operation. Check ignition timing and ignition system.
- Check fuel system. See appropriate A-7 FUEL SYSTEM DIAGNOSIS CHART in COMPUTERIZED ENGINE CONTROL section. Perform injector balance test. See appropriate C-2A INJECTOR BALANCE TEST in COMPUTERIZED ENGINE CONTROL article. Check cylinder compression.