Fuel injectors can fail from contaminants such as dirt, carbon buildup, or low-quality fuel clogging the injector. Sometimes they can be cleaned, but they often require replacement.
A fuel injector can leak due to aging of its rubber seals, or it can leak from cracks in the injector itself. If the seals are the culprit, they can usually be replaced on their own. However, the only remedy for a cracked injector is complete replacement. The electrical components of an injector can also fail from age, heat, and moisture damage. A faulty or clogged fuel injector will cause an engine to misfire because one or more of the cylinders is not receiving the fuel it needs to run properly.
These misfires are usually felt as a rough idle or lack of power and may go hand in hand with a check engine light. If a fuel injector is still spraying and working properly but is leaking, there will likely be a fuel smell present while the vehicle is running.
A leaking fuel injector is a definite safety concern, as the leaking fuel and vapors can ignite under the hood and cause a fast-spreading fire. An injector that is clogged or stops working is not a fire risk, but will cause the vehicle run poorly.
Additionally, it can lead to internal engine damage from fuel starvation and increased temperatures stemming. This works much like the spray nozzle of a hose , ensuring that the fuel comes out as a fine mist. Some cars have multi-point fuel injection where each cylinder is fed by its own injector. This is complex and can be expensive. It's more common to have single-point injection where a single injector feeds all the cylinders, or to have one injector to every two cylinders.
The injectors through which the fuel is sprayed are screwed, nozzle-first, into either the inlet manifold or the cylinder head and are angled so that the spray of fuel is fired towards the inlet valve. The injectors are one of two types, depending on the injection system. The first system uses continuous injection where the fuel is squirted into the inlet port all the time the engine is running. The injector simply acts as a spray nozzle to break up the fuel into a fine spray - it doesn't actually control the fuel flow.
The amount of fuel sprayed is increased or decreased by a mechanical or electrical control unit - in other words, it is just like turning a tap on and off. The other popular system is timed injection pulsed injection where the fuel is delivered in bursts to coincide with the induction stroke of the cylinder.
As with continuous injection, timed injection can also be controlled either mechanically or electronically. The earliest systems were mechanically controlled. They are often called petrol injection PI for short and the fuel flow is controlled by a mechanical regulator assembly. These systems suffer from the drawbacks of being mechanically complex and having poor response to backing off the throttle.
Mechanical systems have now been largely superseded by electronic fuel injection known as EFi for short. This is thanks to the increasing reliability and decreasing costs of electronic control systems.
Mechanical fuel injection was used in the s and s by many manufacturers on their higher-performance sports cars and sports saloons. Chesapeake, VA. Hampton, VA. Norfolk, VA. Virginia Beach, VA. At Tune Up Plus, we want our customers to know that our first concern is their well being during this time. As an Essential business serving our community we will remain open.
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