Top Three Common Problems for Car Engine

Top Three Common Problems for Car Engine 

Once morning your engine doesn't start... What's wrong? if you know how engine works, you can understand the basic things that keep an engine from working. their is Three fundamentals reasons for that problem :
lack of compression , a bad fuel mixor or lack of spark. Beyond that, thousands of minor reasons that can create problems, but these are the "mostly happens reasons" , here is a quick rundown on how these problems

Lack of compression - If the charge of air and fuel cannot be compressed properly, the combustion process will not work like it should. Lack of compression might occur for these reasons:

- Your piston rings are worn (allowing air/fuel to leak past the piston during compression).
There is a hole in the cylinder.
- The intake or exhaust valves are not sealing properly, again allowing a leak during compression
- The most common "hole" in a cylinder occurs where the top of the cylinder (holding the valves and spark plug and also known as the cylinder head) attaches to the cylinder itself. Generally, the cylinder and the cylinder head bolt together with a thin gasket pressed between them to ensure a good seal. If the gasket breaks down, small holes develop between the cylinder and the cylinder head, and these holes cause leaks.

Bad fuel mix - A bad fuel mix can occur in many ways:
- There might be an impurity in the fuel (like water , solid materials in your gas tank) that makes the fuel not burn.
- The air intake might be clogged, so there is fuel but not enough air.
- You are out of gas, so the engine is getting air but no fuel.
- the combustion does not occur properly , as The fuel system might be supplying too much or too little fuel to the mix

Lack of spark - The spark might weak or be nonexistent for many reasons:
- worn out of your spark plug or the wire leading to it  so , the spark will be weak.
- if the system that sends a spark down the wire is not working properly, there will be no spark or If the wire is cut or missing
- If the spark timing is off either too early or too late in the cycle , the fuel will not ignite at the right time, and this can cause all sorts of problems.

Many other things can go wrong. For example:
- If the bearings that allow the crankshaft to turn freely are worn out, the crankshaft cannot turn so the engine cannot run.
- If the battery is dead, you cannot turn over the engine to start it.
- If the valves do not open and close at the right time or at all, air cannot get in and exhaust cannot get out, so the engine cannot run.
As you can see, an engine has a number of systems that help it do its job of converting fuel into motion. We'll look at the different subsystems used in engines in the next few sections.
- If you run out of oil, the piston cannot move up and down freely in the cylinder, and the engine will seize.
In a properly running engine, all of these factors are within tolerance.
- If someone sticks a potato up your tailpipe, exhaust cannot exit the cylinder so the engine will not run.

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