Recently CarMD Corp. conducted a study and compiled the findings into what they called their Vehicle Health Index. CarMD is a device that plugs into your vehicle and then downloads vehicle repair data, letting you know what’s wrong with your car. Among the findings of the study were the top five most common repairs you can avoid through proper maintenance:
Engine Misfire: Each spark-plug on your car is electrically timed to fire at precise timing to deliver power from the engine. If the spark fires at the incorrect time or not at all, it is considered a misfire. Misfiring of a cylinder can happen for numerous reasons.
Evaporated Emissions leak and/or failure: The evaporative emissions system control (EVAP) system is designed to trap gas tank fumes. The system consists of the fuel tank, vapor lines, liquid vapor separator to prevent liquid gasoline from entering the system and the EVAP Canister, which has a purge valve on it. Fumes are trapped inside the canister, which is full of activated carbon. At certain times during engine operation, the canister purge valve opens up letting fresh air into the canister. This in turn forces the trapped gas fumes back into the engine’s air intake and thus burned inside the engine.
System Running too lean: If a “System Too Lean” code comes up, it’s usually due to a vacuum leak, faulty injector driver, bad injector or a software update needed. The performance computer monitors engine operating elements such as coolant and air intake temperatures, amount of airflow into the engine, throttle position, etc. If the problem-code pops up, it’s because one of these areas is compromised.
Catalytic Converter failure: Catalytic Converters fail for two reasons: either because of a leak from rust and corrosion setting in, or internal plugging from excessive carbon buildup or collapsed baffle or catalyst. The catalytic converter is a device that burns up any unburned gas in the engine exhaust, cleaning the tailpipe emissions. Problems crop up when more unburned gas is fed into the catalytic than it can process. For lack of a better term, the catalytic becomes “constipated” or clogged as a result of too much gas being fed into it. The clog takes the form of a “rock” of carbon that forms inside the cat, causing a restriction of exhaust gas flow.
Exhaust Gas Re-circulation (EGR) System failure: EGR stands for Exhaust Gas Recirculation. This is an emissions system designed to lower combustion chamber temperatures in order to lower formation of NOx (Oxides of Nitrogen) gas, which contributes to harmful air pollutants.
For More information on these repairs read more here: http://autos.aol.com/article/preventing-the-five-most-common-auto-repairs/