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What Causes the Fault Code for Misfire in Cylinder 4?

1 Answers

DelAustin

07/29/25 3:07pm

It may be due to dirty fuel lines or component failure. If the vehicle has not undergone effective cleaning for a long time, it is recommended to clean it first, as poor fuel combustion can also lead to misfire and cylinder deactivation issues. If the fuel is indeed dirty, even replacing components will still result in misfire and cylinder deactivation in the future. Additional relevant information is as follows: 1. Automotive repair involves using the elimination method for testing to achieve the greatest improvement at the lowest cost. If the vehicle has not used effective cleaning agents for a long time, it is recommended to clean it first, as misfire and cylinder deactivation issues caused by poor fuel combustion are common. 2. If the fuel is dirty, replacing components will inevitably lead to misfire and cylinder deactivation in the future. Directly add three cans of China VI standard fuel additive to the fuel tank and run three tanks of fuel. Most misfire and cylinder deactivation issues, as long as they are not caused by component problems, will smooth out. It is recommended to check if the vehicle's exhaust valve has any issues, try replacing it with a new one, and if that doesn't work, clean the vehicle's fuel injectors and check if the engine's cylinder pressure is normal.

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