The fuel injection system is one of the most significant parts in your car’s engine. It controls the delivery of fuel into the internal combustion engine with the right amount. So I can say that fuel injection is the responsible for your car’s performance, fuel economy, and emissions.Anyway, here are some maintenance guides for fuel injection system, which I got from the Car Care Council website (www.carcare.org).- On cars with fuel injection, some carmakers don’t recommend replacing the filter at all during the first 100,000 miles of “normal” driving. Since “normal” usually constitutes severe driving because of less than normal conditions, it’s best to replace the filter every two years or 24,000 miles.- A contaminated filter can restrict fuel flow from your car’s electric fuel pump, eventually taking a toll on its life. Frequent filter replacements remove all doubt about whether the filter may cause other problems down the road. On 1996 and newer vehicles, your car’s fuel injection system is integrated with a second-generation onboard diagnostic system, known as OBDII.- The PCM stores a Diagnostic Trouble Code (DTC) when it detects a problem in one of the monitored circuits. A professional technician can access this information using a scan tool connected to the vehicle’s Data Link Connector (DLC). Although many DTCs are sensor-related, it does not necessarily indicate a faulty sensor. There may be problems in that sensor’s circuit, or there may be several interrelated problems.- Areas of the country with an emissions testing program are placing added value on OBDII checks, where this technology may be used in place of tailpipe testing. The system also alerts you with a Malfunction Indicator Lamp (MIL), indicating that the system has detected a problem, which could cause excessive emissions. This light is usually labeled SERVICE ENGINE SOON or CHECK ENGINE.- If the light appears, you should have its cause investigated by a professional technician at your earliest opportunity. If the light flashes, the condition is more severe and must be checked out immediately to prevent damage to the catalytic converter. News source: Auto Repair Info