Rajan Wilcox
Fuel injectors are a commonly replaced component, especially in older vehicles. Fuel injector failure can be caused by a number of factors, including mechanical and electrical issues. For example, fuel injectors can become clogged with dirt and debris, or contaminated with carbon buildup. They can also be damaged by incorrect installation, or suffer from internal o-ring failure, leading to leaks. In some cases, fuel injectors may simply be worn out or broken, requiring replacement. Given the range of potential issues, it can be difficult to diagnose fuel injector failure, and misdiagnosis can add cost and frustration to repairs.
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What You'll Learn
Fuel contamination and carbon build-up
Carbon build-up, also known as coking, is another common issue with fuel injectors. It occurs when fuel, oil, and vapors leave behind carbon deposits, especially in direct injection engines. These deposits can distort the injector cloud shape, leading to a distorted combustion flame front and potential engine misfires. Carbon build-up can also affect the spray pattern of the fuel injector, resulting in poor atomization of the fuel and subsequent issues such as high emissions, poor fuel economy, and poor performance.
To prevent and address fuel contamination and carbon build-up, regular maintenance is key. This includes changing the oil regularly, replacing spark plugs as recommended, and performing fuel injector cleaning. There are also commercial fuel injector cleaners available that can help remove debris and gunk from the injectors, improving their performance.
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Internal o-ring failure
Over time, O-rings can harden and become brittle, leading to both external and internal fuel leaks. This can cause fuel to leak externally from the injector, often where the plastic connector is moulded to the metal injector body. Engine heat can also cause O-rings to become brittle and crack, resulting in fuel injector leaks.
Leaking fuel injectors can lead to engine damage and are dangerous for the driver and passengers. Symptoms of a faulty O-ring include a rough idle, hard start when the engine is hot, poor emissions, fuel odours, oil thinning, and hydrolock.
To diagnose a bad O-ring, it is recommended to inspect the fuel injectors for any signs of leakage or misting. If the O-rings are split, stretched, or cracked, they need to be replaced.
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Electrical issues
Fuel injectors are electro-mechanical devices, so they can fail due to electrical issues. The injectors contain a coil of wire wrapped around a bobbin. When an electrical current is passed through the coil, it creates a magnetic field that causes the pintle to lift off its seat, allowing fuel to spray. When the current is shut off, the magnetic field collapses, and a spring pushes the pintle back onto its seat, shutting off the fuel flow.
Low impedance injectors, also known as "peak-and-hold" injectors, are fired differently from high impedance injectors. Low impedance injectors usually have a resistance value of 1.8-3.0 ohms, while high impedance injectors typically have a resistance value of 11-15 ohms. On vehicles with peak-and-hold injectors, the electronic control unit (ECU) pulses the injector by applying full current, creating a strong magnetic field that lifts the pintle. The ECU then reduces the current flow to keep the injector open for the duration of its pulse time.
It is important to note that fuel injectors are susceptible to contamination and carbon buildup, which can restrict fuel flow and lead to similar issues. Therefore, it is recommended to clean the injectors regularly and replace them if necessary to prevent electrical and mechanical failures.
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Incorrect installation
One of the most common reasons for injector failure is contamination. This can be caused by grit or contaminated fuel passing through the main fuel filter and clogging the small mesh filter in the top of the injector. This can also be caused by fuel quality, driving conditions, and injector design. Restricted injectors can cause a reduction in fuel flow and affect the spray pattern, resulting in poor atomization of the fuel. This can lead to high emissions, poor fuel economy, and poor performance.
Another reason for injector failure due to incorrect installation is internal o-ring failure. O-rings keep the fuel from leaking out of the injector where the mechanical parts are assembled. If these o-rings fail, the injector will leak fuel externally, usually around where the plastic connector is molded to the metal injector body. This can cause fuel odour and reduced fuel efficiency.
In addition, incorrect tightening torque and inadequate cleaning of the nozzle during installation can cause performance issues, misfiring, black smoke, and the appearance of the check engine light.
It is important to have access to the correct scan tools and procedures to diagnose fuel injector issues accurately and prevent further problems and costly repairs.
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Poor-quality remanufactured injectors
Remanufactured injectors are the most common service solution for fuel injectors. However, not all remanufactured injectors are created equal. While some remanufacturers will replace a higher percentage of components with new parts, others will reuse old parts to cut costs. This can result in poor-quality remanufactured injectors that fail to perform as well or last as long as their higher-quality counterparts.
When purchasing remanufactured injectors, it is important to verify that they are Original Equipment Manufacturer (OEM) parts. OEM parts are built to the same standards as the original parts and will perform and last just as well. Non-OEM parts, on the other hand, may not meet the same quality and engineering standards. They may have issues such as sticking or poor spray patterns, and may not deliver the proper mix of air and fuel to the engine, resulting in poor performance.
It is also important to buy from a reputable shop with solid reviews. A good remanufactured injector will have been disassembled, inspected for wear, and rebuilt with new components. It will then have been rigorously tested to ensure it meets OEM specifications. A low-quality remanufactured injector, on the other hand, may be sold by a third-party manufacturer looking to cut costs by reusing old parts. More than half of these injectors fail standard testing procedures, and they can cause a whole host of issues, including poor performance, misfiring, black smoke, and the appearance of the check engine light.
In conclusion, while remanufactured injectors can be a cost-effective solution, it is important to be wary of poor-quality injectors that may end up costing more in the long run. By verifying that injectors are OEM and buying from a reputable source, you can avoid the issues that come with poor-quality remanufactured injectors.
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Frequently asked questions
There are several signs of a failing fuel injector, including poor idle quality, failed emissions tests, poor cold engine performance, poor fuel economy, and poor acceleration. If your car has an ECU, a "Check Engine" light may also indicate a fuel injector problem.
Fuel injector failure can be caused by a number of things, including contamination, carbon build-up, and internal o-ring failure. Fuel injectors are also susceptible to electrical and mechanical failure modes.
To prevent fuel injector failure, it is important to have an understanding of how and why fuel injectors can fail, as well as access to appropriate diagnostic procedures and technical tips. Regular servicing and maintenance can also help to identify and address any potential issues before they cause failure.
If your fuel injector is failing, you should first diagnose the issue accurately to determine the cause of the failure. In some cases, a simple solution such as adding a fuel injector cleaner may be enough to resolve the issue. However, if the fuel injector is cracked or broken, it will need to be replaced.
