Comments (0) Modern vehicles use computers that feature on board diagnostics (OBD). These computers use sensors to watch various engine functions. When one of these sensors detects a signal that is outside of the range set by the car manufacturer, it turns logs a diagnostic trouble code and turns on the check engine light. This light indicates to the driver that the needs to be checked out.
Codes generated by the on board diagnostic system. A mechanic can use these codes to find out exactly what is happening inside the engine.
On board diagnostics are built into every modern car. The computer in the car monitors signals from sensors in and around the engine to monitor its health and performance.
These diagnostics can help a mechanic see what is going wrong on the car, but not why. It is important to remember that there is nothing that can magically tell the mechanic what needs to be replaced to fix the problem. A good mechanic is still needed to interpret these diagnostic results.
Responsible for keeping raw gasoline fumes inside the tank. Uses a system of hoses and valves to process air through the system. A charcoal filter traps any hydrocarbons in the air to prevent them from entering the atmosphere.
Did you know that your check engine light can be turned on by something as simple as a loose gas cap? The vapors above the liquid fuel in your gas tank are one of the largest volumes of hydrocarbons in your car. The EVAP system is responsible for managing these vapors. Air entering and exiting the fuel system is run through a series of filters to keep the vapors from escaping. While the car is running and the tank is between 1/3 and 2/3 of a tank, the system is tested to see if it can hold pressure. If a leak is detected the system turns on the check engine light, with a code indicating a leak in the EVAP system. It is up to the technician to find the leak in this complex system of filters and hoses. However, if the gas cap is left loose or the car is run without a gas cap, the EVAP system will see this as a leak and turn the light on.
Because it is an easy thing to do, when your check engine light comes on, check your gas cap. Did you drive off and forget it, then find it later? It may be that easy to fix.
Refers to the parts that make the car move. This includes the engine, transmission, driveshaft, differential, and more.
Some parts on cars can be rebuilt by specialty companies and sold again at a lower cost. This is most common with driveshafts and alternators. These parts typically lost signifantly less than the new part. When purchased from a reputable company, will usually perform as well as a new part.
Used to transfer movement from the transmission to the wheels.
On rear wheel drive cars they typically run down the center of the car, underneath the floor to the rear axle.
On front wheel drive cars there are 2 running from the middle of the car outwards to the wheels, just behind the engine.
Joint in a shaft that allows the shaft to bend while turning. Most commonly used in driveshafts on rear wheel drive cars.
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