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Top 5 Reasons Your Car Misfires.

There are lots of reasons as to why a car would misfire in the first place. To help you understand what might have been the cause of your car misfire, below are five of the most common causes that someone could experience in this situation.

1) Air to Fuel Ratio Imbalance.

One of the main reasons for an engine misfire can be attributed to an imbalance in the air to fuel ratio within the internal combustion chamber. This usually means there is not enough fuel and too much air being mixed together

For the combustion to be successful, the mixture needs more fuel than air. Otherwise, you will notice the cylinder misfire while your engine is idling. But when you’re driving at faster speeds, the symptoms of the misfire will go away.

The reason there may be an imbalance could be due to a bad fuel pumpclogged fuel filter, or a bad air flow sensor.

2) Ignition System Issues.

dirty spark plug

There could be a problem coming from any one of the components in the ignition system. Perhaps the spark plugs aren’t creating an adequate spark for the internal combustion chamber.

You could also have a worn-out ignition coil, ignition cables, rotor, or distributor cap. If any of these problems exist, the internal combustion chamber’s air and fuel mixture won’t be able to ignite properly.

The weak spark will cause an engine misfire, but you might not notice right away. But as you operate the vehicle, you’ll feel its jerkiness very well.

3) Transmission Issues.

bad torque converter symptoms

There are times when the misfire might not even come from your engine. It could come from the transmission instead. If your car starts to jerk around like an engine misfire had occurred, your transmission may not be able to adequately shift up or down.

You will notice this more when you’re driving at faster speeds. This is a bad situation like any other misfire and you need to have it repaired right away.

4) Mechanical Problems.

how an engine works

Your vehicle is made up of many mechanical parts which contribute to the functionality of the engine. There are piston rings, camshaft lobes, valves, and cylinder walls.

If any of these parts were to get worn out, it could cause an engine misfire. The same goes for when there’s an intake manifold gasket leak or a head gasket leak.

Other possible mechanical issues may include a bad fuel injector or damaged rocker arms. Check the timing belt to see if that’s installed correctly too because it may have slipped.

You will know when there’s a misfire caused by mechanical issues because there will be a thumping feeling from the vehicle that will never go away, regardless of your speed.

5) ECM Problems.

bad ecu

Sometimes there may be a glitch in the engine control module or the central computer of the vehicle which manages the engine. Any minor glitch there could throw off the combustion process and cause a misfire.

Fortunately, there is an easy remedy to this type of problem that works most of the time. If you simply disconnect your battery for a few minutes and then reconnect it. It’s similar to rebooting a computer at home and this should solve any minor glitch or bug in the computer system.

If the bug still exists after that, then you need to have the central computer examined at the dealership where you got the car.

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