A car exhaust that is backfiring is caused because of the engine is misfiring. If the exhaust on your car is backfiring, the cause why it is backfiring can be because of damaged spark plugs. Damaged spark plugs can cause poor timing to occur to your car's engine, which can be one cause why a car exhaust can backfire. So i suggest you examine all the spark plugs that are currently in your car's engine, if they look bad and then replace them.
The air filter inside your car engine can also be blocked, which can be the cause to your car to backfire. A blocked air filter can cause misfiring and poor fuel consumption. So locate were the air filter is in your car's engine, remove it and clean it if necessary. To give it a quick clean, rinse the air filter under warm water, which will get rid of all the grease.
If you have replaced the spark plugs and have also clean out the air filter and the car is still backfiring, then the timing belt or chain inside your car's engine needs replacing. If you have not changed it for a while, what can happen is the teeth on the belt can be worn out, which can cause the car exhaust and engine to backfire, due to poor timing. So head your local garage to get the timing belt or chain inspected.
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