A getting on car drive off jerkily from a stop sign, tires screech as it lurches and bucks, with shotgun bangs pending from the tailpipe. The exhaust is panting blue-black from the tailpipe and the ancient car shudder to a stop. A final pop from the exhaust closes this familiar sight. It's an overstatement of how a backfire actually occurs, but it's not totally inaccurate. The smoky exhaust indicates an inefficiently performing engine. The jerky driving spells out that it's out of tune. And that final detonation at the end is actually fairly common in this situation.
Reasons behind the Problem:
1. A High Fuel-to-Air Ratio:
From time to time, the engine gets the provider of fuel more than it can be on fire. This situation is recognized as 'running rich.' When engines run rich, it burns fuel slowly, causing the extra air to forcefully burn the unburned fuel and discharge out when the exhaust valve opens. A dirty air filter is a reason for this problem to happen in most cases.
2. Carbon Tracking:
While discussion about what makes a car backfire, we have to think about carbon track. Carbon tracking can happen to all types of car the models that use distributor cap and the ones that have ignition coils. In an old car with a distributor cap, the sparks can go crossways from one wire to another due to environmental factors.
3. Broken Distributor Cap:
Not working Distributor Cap is one of the answers for the problem "What cause a car to backfire". a few car models don't have ignition coils on the spark plugs. They share out electrical pulses across spark plugs by the use of a distributor cap and a set of wire.
4. Inaccurate Engine Timing:
as well known as retarded timing, it indicate that the engine cycle of fuel-compression-ignition-exhaust in the cylinder top is out of sync with the base part of the cylinder. Due to this problem, the ignition cycle begins late in the combustion chamber.
5. Worn out Air Gulp Valve:
Cars manufactured in the early 2000s or previous to that period are probable to have an air inoculation unit by an air gulp valve. The valve is the passageway for air to enter the system when the engine is under load. When it's malfunctioning, it releases air into the combustion chamber even at the time of de-acceleration.