We test supported petrol injectors on our ASNU equipment and supported common-rail diesel injectors on a separate Delphi bench. Send the injector make and part number before booking so we can confirm the right equipment and test.
Our ASNU equipment checks supported petrol injector designs, including top-feed, side-feed, mechanical and selected GDI units.
Compatibility and service parts depend on the injector design. Send the part number before arranging the work.
Ask about petrol injectors
Our Delphi diesel bench tests supported high-pressure common-rail injectors for flow, leak-back and spray performance.
VW PD (Pumpe Düse) unit injectors are not supported.
We often see VAG FSI/TFSI vehicles booked in to resolve misfires or for preventative carbon cleaning. In our experience, removing the carbon often exposes underlying injector faults, so cleaning alone may not resolve the original misfire.
Most of the VAG-group GDI (gasoline direct-injection) injectors we encounter use a filter-basket design that is prone to deterioration. If your injectors have this design and the baskets have not previously been replaced, you should expect to need replacement injectors.
Carbon covering the injector tips can restrict fuel flow and partially mask internal damage caused by filter-basket failure. Cleaning restores flow through the tips, which can make that existing damage more obvious. An existing misfire can become worse and become detectable by the engine control unit (ECU) after cleaning. In this situation, cleaning has exposed a pre-existing fault; it has not caused the internal damage from the failed basket.
An injector can already be failing and still pass ASNU bench tests. Our ASNU testing checks performance under bench-test conditions; it does not reproduce every condition in the vehicle. An injector may pass these checks yet fail at the higher fuel pressures supplied by the vehicle's high-pressure fuel pump (HPFP).
Where the injector design is serviceable, a specialist rebuild may be possible. Otherwise, replacement is required, and replacing the complete set may be the appropriate repair. Cleaning and a successful bench test do not renew damaged injector internals. Please allow for this possibility before booking. Injector rebuilding or replacement is additional work, separate from walnut blasting or the original cleaning and testing service.
Testing can help when an injector fault is suspected, when assessing a used set, or when preparing a performance build. It measures the injector itself; it does not by itself diagnose every vehicle running fault.
If the cause of a vehicle fault is not known, start with a vehicle fault assessment before removing parts.
For a performance build, tell us the fuel, operating pressure, engine details and power target. That helps us consider the injector results against the intended setup.
Discuss service history and engine use when planning maintenance or a dyno tuning session.
The steps below describe the ASNU petrol-injector workflow. The tests and service parts available depend on the injector design; diesel injectors are tested separately on the Delphi bench.
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For builds that need a different fuel-system capacity, ask us about ASNU high-flow injectors, high-output pumps, fuel rails and related hardware. Suitable parts depend on the engine and complete setup, so we confirm fitment and options by enquiry.
Ask about ASNU injector options for your engine and fuelling target.
We can discuss pump options for the vehicle, fuel and planned setup.
Rails, fittings and other fuel-system components are application-specific.
Product images show examples from the ASNU range. We confirm suitable parts and current options for your application before quoting.
For a bench test, contact us before supplying removed injectors. For diesel vehicles, we can also discuss a workshop booking for injector removal and refitting. VW PD (Pumpe Düse) unit injectors are not supported.
Include the vehicle and engine details, injector make and part number, quantity, reason for testing, whether the injectors are fitted, and any previous test results. For ASNU fuel-system parts, tell us the engine, fuel and build target so we can check suitable options.
Removal, refitting, replacement parts and any vehicle adaptation are discussed and quoted separately from bench testing. For associated work, see upgrade fitting and coding and adaptation.
The injector design, number of units, tests required, cleaning suitability and service parts affect the scope. Any vehicle removal and refitting is quoted separately. We can discuss the options once we have the injector details.
Ask us to confirm compatibility, testing and suitable ASNU parts for your setup.
Contact us about injectors