Misfiring. How to find the cause?

Your car lost power, the engine operates intermittently, and in the upgrade you can only log into second gear? In this case, you may suspect a misfire. And if the onboard computer can detect the error "P". The numbers next to the letter will mean, in what cylinder has the misfire: 0301 - the first, 0302 in the second, 0303 in the third and the 0304 in the fourth. What is the problem?

Misfiring is a phenomenon occurring in the engine, when one cylinder accelerates slower than the other, thereby breaking the process cycle. As a result of deteriorating the exhaust, increases fuel consumption, the car "twitches" but does not come.

In this case, there are two ways: visit the service center, where qualified specialists will solve your problem, or try on its own to eliminate the misfire. the cause of the problem can be very different. In this article, we consider only the most common:

1. Because of the low quality fuel clogged injectors. In this case you only need to replace the gas station or go to vysokooktanovyj gasoline. But  should know that a lean mixture can occur due to some failures of the pressure regulator, fuel pump or the goal of the filter.

2. Perhaps you have a broken candle - with more or smalenkimi gap. They can also be just poor quality.

3. High voltage wire, mechanically damaged or high resistance can also cause misfire.

4. The ignition coil or the module failed.

5. Low or uneven compression can result in inadequate levels of compression of the working mixture.

6. A misfire can also occur due to improper timing of regulatory clearances.

7. Leaky lifters.

8. The failure of any cylinder that may occur, for example, due to the reduction of the gap between the cylinder and the piston of the internal combustion engine.

How to find the reason?

To some extent, the task is easier if your car is equipped with "electronic brains". In this case you can use autotester, which can directly show the error codes (misfiring that occurs in the first or third cylinder, for example). In addition, the shape can be identified and the direction of the search of the root cause. For example, the code 0300 means misfire, which occur in all the cylinders. In this case, the likely cause is a bad fuel mixture. This means that the causes can be the following: low pressure due to bad pump or too high air leak.

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If you do not have an electronic assistant, you can find the reason the old-fashioned way, proven. Start with the electric equipment under the hood: spark plugs, high voltage wire, the condition of the fuel pump, measurement of cylinder compression. In the final stage, if the misfire persists, proceed to the inspection engine. Remove the cover cylinder head and prediagnostic condition of valve guides and rings.

Some models of the internal combustion engine camshaft located in the cylinder head. In this case, to inspect the valve spring, remove the cylinder head. Good luck in finding the cause!