5 Top Causes of Engine Misfiring In Your Truck

Engine misfiring is an issue that results from an incomplete or zero combustion in one or all the combustion chambers. As a driver, you will feel your truck dragging when this happens. If your truck is modern, you will see the engine check-light on the dashboard. 

Why your Engine Misfires

Engine misfiring can result from various reasons. A faulty sensor can make your engine to misfire or other causes. If you experience these issues, you must take your truck for diagnosis to repair the issue as soon as possible.

Common Causes of Engine Misfiring

When your truck develops an engine misfire, you will ask yourself why it is happening. Various reasons make your engine misfire; thus, it isn’t easy to find an accurate answer to the question. If your truck has this problem, it must be taken to professionals to determine the cause. Here are some of the common causes that the professional might find.

Problems with the Ignition System

When there is engine misfiring, you will first think of problems with the spark plug. The spark plugs are part of the ignition system, which has various components, such as the control module, crankshaft position sensor, coil packs, wiring, and spark plug. If any of these parts develop complications, your engine will misfire.

Problem with the Air and Fuel Delivery

The air and fuel mix inside the engine before being ignited by the spark plug. The combustion initiates motion and the creation of the rotational force which propels your truck on the road. Bad injectors might interfere with the air and fuel mixture. In such a situation, your truck will misfire.

Problems with the Emission Equipment

Modern trucks have several emission equipment which help minimize pollution in the atmosphere. The exhaust gas recirculation (EGR) system and the positive crankcase ventilation (PCV) system are parts of the emission equipment. Problems with the emission system interfere with the air-fuel mixture in the combustion chamber. They can lead to pressure accumulation because the exhaust gases will build up in the combustion chamber. Such a situation can make your engine misfire. 

Mechanical Problems

When your engine develops mechanical issues, the chances that it will misfire are very high. The engine has various cylinders, and each cylinder has a piston. The piston compresses the air and fuel mixture for complete combustion. The cylinder must be completely sealed when the piston makes an up or downward motion. When the engine is having mechanical issues, the cylinders might not be able to seal properly, leading to an engine misfire. 

Sensor and Module Problems

Modern trucks have various sensors, and some of them you will come to know when they become faulty. The PCM depends on these sensors to determine the control of vital functions like fuel delivery and spark timing. Due to this, the problem with any of the sensors can make your engine misfire.


If your truck is misfiring, any of the above can be the cause. It is necessary to take your truck to a mechanic for a check to determine the actual cause and fix it as soon as possible.

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