Rough idle, sluggish acceleration and misfiring are all signs of clogged fuel injectors. The fuel system has filters, but over time they become damaged by dirt and debris. Once this happens, the likelihood of the injectors becoming clogged increases.
The symptoms of a rough idle and sluggish acceleration can also be attributed to a clogged fuel filter, but actual misfiring, especially in a late model car, is more likely to mean that the injectors are clogged. The reason for this is that injectors do not clog in unison, meaning that one or two injectors are more clogged than the others. Under hard acceleration, this usually results in one or more cylinders misfiring. This is less apparent in older models as the simultaneous injection system allows unclogged injectors to make up for clogged ones. Performance is still affected, but it may not be as obvious initially.
Clogged fuel injectors can sometimes be caused by low quality gas without additives. To compensate for this, a fuel injector cleaner can be added to the fuel tank after every other fill-up; however, fuel injectors do eventually clog regardless of the gas used. At this point, it is best to have them cleaned by a professional repair shop.Learn More
To clean fuel injectors, disconnect the fuel pump, connect it to the gas tank, disengage the pressure regulator, connect and open the cleaning kit, run the engine, disconnect the kit, and reconnect the fuel pump. This one-hour procedure requires a fuel injector cleaning kit, rubber tubing, the vehicle manual and the vehicle key.Full Answer >
Fuel injectors are devices that spray fuel in a very fine mist into an internal combustion engine, mixing the fuel with air to allow it to combust properly. Modern electric fuel injectors are computer-controlled; they monitor the engine's demand for fuel to determine how long each should remain open to inject fuel into the system. The system can also alter the spray to react to changes in the air-fuel mixture.Full Answer >
To clean fuel injectors, disable the fuel pump, deactivate the fuel pressure regulator, attach a fuel injector cleaning kit, run the engine, remove the empty kit and verify proper injector function. This one-hour procedure requires the vehicle key, the owner's manual, a U-tube, a long screwdriver and a fuel injector cleaning kit.Full Answer >
The simplest way to determine if a fuel filter needs replacing is to locate the filter and look for signs of damage and wear. A dirty fuel filter appears brown, sometimes even black, and could also appear brittle and oily. A few simple tools are needed to access the fuel filter, and many vehicle owners manage to maintain and replace their fuel filters without professional aid.Full Answer >