"Auto Clinic Expert Q & A - Fuel Injection." Popular Mechanics. Read on to the next page for lots more about fuel systems and taking care of your car. Whether your injectors are new or old, now's the time to start a preventive maintenance regimen. They can cost several hundred dollars apiece, depending on your car, but you can ask your mechanic to look for rebuilt or remanufactured OEM (original equipment manufacturer, or factory quality) injectors to pare down the cost. ![]() When replacement is the only option, take heed: At the very least, you'll need to replace only the faulty injectors. Try cleaning your injectors before considering a replacement. The fuel then vaporizes, settles and purges when the car is restarted, which can cause extensive damage. Leaky injectors can also cause the car to flood - that's when the engine is shut off with excess fuel trapped in the system. This problem is much more likely to pinpoint a leaky injector than detonation is, because it's a relatively rare occurrence in fuel-injected engines. Preignition is when the air and fuel combust before the spark plug fires, causing severely increased engine temperature and damaged pistons. Detonation is harmless in some cases, but the pressure has potential to break engine components and cause pitting and scuffing around the pistons. Detonation is a fairly common problem in which gas remaining at the end of the normal air/fuel burning cycle (which is set off by the spark plug) spontaneously combusts. Dirty or worn-out injectors can also cause preignition or detonation. Still, faulty injectors can't be overlooked or ignored for long. Keep in mind, though, that while fuel injector cleaner can help restore your car's performance so that its power and mileage are closer to new, it can't improve your car beyond its original specs. ![]() Doing this at regular intervals of 10,000 miles or so might provide more cleansing than your engine actually needs, but it won't harm the system. You can also add fuel injector cleaner to your gas tank, which may help solve running issues such as sputtering. Regularly changing your fuel filter (according to your vehicle manufacturer's recommendations) will help keep debris from circulating. Look for higher-quality gasoline blends that claim to help maintain a cleaner engine by including detergents that prevent deposits. ![]() So do your driving habits - short trips and frequent stops allow more fuel debris to accumulate, since it tends to stick when the engine is idling or turned off often. Though all passenger car fuel is theoretically formulated to prevent grimy buildups, different brands and blends do have an impact on your car's performance. You can delay the degradation process with a few simple steps that take no longer than a regular fill-up, such as buying high-quality fuel. Gasoline of unreliable quality, destructive driving circumstances (such as stop-and-go traffic) and your car's overall condition can add up, causing premature fuel injector failure. Even though injectors are designed and tested in factories where engineers compensate for real-world factors, there are always unknowns and variables. Pollution is in the air, and fuel can be contaminated with water, dirt particles and other debris. ![]() Unfortunately, the conditions you drive in are not ideal.
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