This is how the injector cleaner works
Injectors (fuel injectors): defects, symptoms, and cleaning
Injectors, also known as fuel injectors, give the engine the right dose of fuel before each combustion cycle. Injection nozzles in diesel engines are usually referred to as injectors. Whether gasoline or diesel, injection nozzles are prone to defects in both types of engine.
➤ Benefits of fuel injection
➤ Manifold injection and direct injection
➤ Reasons for defects in injection nozzles
➤ Symptoms of defective injection nozzles
➤ Clean the injection nozzles with the injection system cleaner
➤ Clean the injection nozzles in an ultrasonic bath
➤ Professional cleaning of injection nozzles
➤ Cleaning the injection nozzles: costs
➤ Check injection nozzles in the workshop
➤ Cost of injection nozzles
Advantages of fuel injection
In the past, injection nozzles still worked mechanically, today they are electronically controlled solenoid valves that have become true precision instruments. The nozzles are networked with other components and sensors relevant to combustion via the engine control unit. At the end of the 1980s, gasoline injection largely replaced the carburettor because it offers many advantages. The most important thing is to reduce fuel consumption, because compared to modern injection systems, carburettors are more or less better watering cans. In addition, gasoline injection enables the use of a regulated catalytic converter and is therefore jointly responsible for significantly cleaner exhaust gases.
Manifold injection, direct injection, or both
Intake manifold injection: In contrast to direct injection, the fuel is injected in the intake manifold and has to pass through the intake valve.
All information about technology and repairs
Reasons for injector failure
Injection valves for manifold injection: the tiny openings are barely visible. Deposits can rarely be seen with the naked eye.
Symptoms and consequential damage from defective injectors
Injection valve of a direct injection engine: Since the valves mostly run vertically through the cylinder head, they are much longer.
Clean injection nozzles with injection system cleaner
|Injectors: clean, check & replace||to offer|
Price *: from 11.50 euros
Price *: 11.50 euros
Ultrasonic cleaning devices
Price *: 26.34 euros
Injector test equipment
Price *: from 28.90 euros
Price *: from 2.76 euros
Price *: 25.89 euros
Clean injection nozzles in an ultrasonic bath
Before and after cleaning: The cleaned injection nozzles are given new seals and a new microfilter before they are installed.
© BAR-TEK Motorsport GmbH
Professional cleaning of injection nozzles
The spray pattern of the injection nozzles can be checked on the test bench.
© BAR-TEK Motorsport GmbH
Cleaning the injectors: costs
The costs for the professional cleaning of injection nozzles mainly depend on the type of injection nozzle. The cheapest way to clean intake manifold injectors is: Cleaning a nozzle costs from around 30 euros. In the case of injection valves of direct injectors, between 40 and 70 euros per valve must be taken into account. Piezo injectors, often found in diesel, are cleaned for 70 to 90 euros each. In addition to the prices for cleaning, there are the costs for installing and removing the nozzles. Experience has shown that this is the greater cost factor for direct injection engines. Because the injection nozzles are often difficult to reach. In the case of diesel engines, special tools are required to remove the injectors that are usually very stuck. Depending on accessibility and the number of nozzles to be removed, up to five hours of wages can be incurred for removal and installation in the workshop. In some cases it is impossible to avoid the destruction of the stuck injection nozzles.
Injector type | Prices (approximate)
Manifold injectors | 30 euros
Direct injection nozzles | 40 euros
Piezo injectors | 70 euros
Check injection nozzles in the workshop
Workshops have several options to check the function of injection nozzles without having to remove them. This begins with reading out the fault memory and checking the cable connection of the injection nozzles using a multimeter. A fuel pressure test may reveal other defective components, such as a defective high pressure pump, a worn fuel pressure regulator. In addition, the resistance of the injector solenoid coils can be checked with the aid of an ohmmeter. An oscilloscope can display the voltage and the pulse duration of the individual nozzles in order to compare the values with the nominal data.
Cost of new injectors
The cost of new injection nozzles is very different. Injection valves that work in the intake manifold are already available for less than 40 euros. Injection nozzles from modern direct injectors and injectors from common rail diesels, on the other hand, can cost over 200 euros. Annoying when there are several injection nozzles that have to be replaced. In addition, there are the costs for installation and removal. This is sometimes very time-consuming, especially with direct injection engines and modern diesels. The exchange of two injection nozzles, including removal and installation, easily adds up to over 1000 euros.
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