What is an Injector? | Common Problems of Diesel/Fuel Injectors

This article in concentrated to discus about the following listed below concerning Diesel injector and fuel injector.

  • What is an Injector?
  • Types of Injectors?
  • Common Problems of Diesel and Fuel Injectors?
  • How to diagnose Diesel injector and fuel injector problems?
  • The Importance of Diesel injector and fuel injector problems?

What is an Injector?

An injector is a valve with electronic controls that receives signals from the engine control unit.

There are Two Types of Injectors, namely:

  1. Fuel Injectors – This are types of injectors are Electric valves that uses fuel only.
  2. Diesel Injectors –

What you should know about Fuel Injector :

  • About Fuel Injectors
  1. Electric valves which when open allow fuel to be injected into the engine under high pressure.
  2. Fuel injectors are either fully open or fuel close; there is no in-between. As a side note and simple warning.
  3. Fuel injectors can become dirty and clogged and it would be good to remember that fuel injector cleaning can resolve many drive-ability and performance issues.
  4. Diesel fuel systems operate at very high pressures. Injection pressures of 1800 bar (26,000psi) are not unusual. There is a risk of serious injury or death from contact with high pressure fuel.
  5. It is dangerous to remove an injector and start the engine to check its spray pattern.
  6. Some electronic diesel injectors work on high voltage (around 150 volts) and there is risk of severe electric shock.
  7. Common Rail fuel systems typically incorporate single use fuel pipes. That is, once the pipes have been loosened, they must be replaced as it is not possible to reliably reseal them due to the very high pressures involved.
  8. Electronic injectors are often individually calibrated to the engine management computer and must be refitted into their original place. If mixed up, or the injectors are overhauled, the system will need to be recalibrated.

Bear in mind also that injector nozzles have very fine spray holes and a well blocked nozzle may not be recoverable at all.


Common Problems of Diesel and Fuel Injectors?

  • Inconsistent Engine Power – An inconsistent fuel supply can cause the engine to rev high and low, with the RPM gauge fluctuating.
  • Misfiring Engine – When the fuel supply is inadequate upon ignition, the engine might misfire. An 8 to 10 percent reduction in one fuel injector can cause this to occur.
  • Uneven Engine Idling – An engine should idle smoothly, but an uneven fuel supply will cause idling disturbances.
  • Fuel Scent – Leaking fuel from a faulty fuel injector will create a strong gasoline smell.
  • Diminished Gas Mileage – A fuel injector that delivers drops of gasoline instead of a mist will make for inefficient use of the gas, reducing the car’s gas mileage.


How to diagnose Diesel injector and fuel injector problems

Here we have listed out three (3) major step to diagnose Diesel or Fuel injector problems. These tests are relatively simple, though they do require accessories to complete them.

  • Measure Exhaust Manifold Temperatures

If a fuel injector will not close, it will dump gasoline on the catalyst that opens and closes the valve, causing it to overheat and burn out. This will produce high temperatures at the exhaust manifold while the engine is warm. If the valve will not open, an excessive amount of oxygen will disable the catalyst, producing excessively low temperatures at the exhaust manifold. To determine whether this is an issue, point a laser thermometer at the pipes of the exhaust manifold while the engine is warm. A normal reading on each cylinder will be within 30 degrees of 450 degrees Fahrenheit. An injector that will not open will yield a temperature of 200 to 250 degrees and an injector that will not close will show temperatures of 600 degrees or more.

  • Listen to the Fuel Injectors

Another helpful diagnostic tool is an engine stethoscope. This tool enables a car owner to listen for any problems with the fuel injectors by placing the tip of the stethoscope on each injector. Fuel injectors make a sharp clicking sound when they are functioning properly, so the absence of this sound can indicate a problem with an injector.

  • Inspect the Fuel Injectors

A third way that car owners can diagnose their cars’ fuel injectors at home is by removing the fuel injectors and inspecting them. Start by detaching the fuel rails to which the injectors are likely attached. After removing the rails, detach each fuel injector from each rail. Fuel will flow from the rails as each injector is removed, so be sure to wear gloves during this process. After removing all of the fuel injectors, inspect each one for signs of cracks or damage to any of the parts within the injectors.

The importance of Good Fuel injectors

  1. Fuel injectors is a system for admitting fuel into an internal combustion engine.
  2. They do so in a manner that enables the engine to use the gasoline as efficiently as possible, saving owners money in gasoline costs.
  3. They gives vehicles better gas mileage.
  4. They cuts down on the pollution that they emit in comparison to older technologies.





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