My car has 131000 miles.
My car has an automatic transmission.
Hello. Backfiring can be caused by many things. A few common causes are low quality fuel or problems with the fuel, ignition issues, or a problem within engine management systems. If the vehicle is filled with low quality fuel, it may be possible that it is pinging or knocking under heavy load causing the backfires. Backfires can also be the result of engine performance system issues. If a component, such as an ignition coil, MAF sensor, or fuel injector have an issue, they can cause the engine to backfire under heavy loads. If the issue persists or worsens, I would recommend having a professional technician diagnose the backfiring problem, as the possibilities could be many