Backfiring
'94 Southwind 454 TBI. When climbing hills just before downshift from overdrive when the engine starts "lugging" it sometimes backfires. After downshift it runs "OK". Engine has 41,000 miles and ra...
Forum Discussion
Backfire through the exhaust is usually too rich of mixture or misfire etc allowing unburned fuel to pass into the exhaust. Backfire through the intake is usually too lean of mixture.
