Fuel Injector Testing, Cleaning & Calibration


Electronically-controlled fuel injectors are very durable, precise metering systems capable of pulsing for millions of cycles. The most common problem with injectors is that they accumulate a buildup of wax, tar, and olefins inside the injector and on the pintle/seat area. These types of debris buildup will restrict the flow of fuel through the injector. These are elements of the petrol that are baked on the injector after the engine is turned off and the temperature climbs to the highest point.

The injectors are manufactured to such close tolerances that a 5-micron buildup ( a human hair measures 40 to 90 microns) will reduce the flow up to 25%. The ANSU is the only cleaning method recognised to cleanse these precise metering devices without damaging the components. Ultrasonic waves are used to break up the contaminates while the injector pulses. The debris is then carried out of the injector by a biodegradable


At Turner Diagnostics, we are fuel injection experts, offering:Injector Test and Cleaning Rig
  • Cleaning Injectors
  • Replace All Applicable Parts (O Rings, Pintle Caps, Filter Baskets, where stocked)
  • 17.95 Per Injector for Port Injectors
  • 1, 2, 4, 6, 8, 10 Injectors
  • Port Injectors
*Petrol injectors only, low pressure (10 PSI) to high pressure (80 PSI)

Properly cleaned and maintained fuel injectors offer many benefits:
  • Savings to the motorist with improved fuel consumption
  • Lowered repair bills
  • Prolonged oxygen sensor life
  • Prolonged life of the Catalytic Converted Exhaust System
  • Preserves the environment from exhaust pollution by reducing CO (carbon monoxide) pollution by an average of 36%
How does the ASNU work? spray-jpg-231x135.jpg
  1. FAIR - but weak
  2. BAD - split spray pattern
  3. BAD - split spray pattern
  4. BAD - jetting on left side
  5. GOOD
  6. BAD - feathering at top of spray

When the injectors are removed, the operator is looking for good spray patterns, flow rates, and any solenoid failure throughout the range. The injectors are removed from the vehicle and then ASNU tests for:

  • Leaks
  • Fuel Spray Management
  • Fuel Delivery Volumes
  • Electronic Operation

After the injectors are clean, the serviceable items are replaced. The injectors are refitted (where stocked) with new filter baskets, pintle protection caps, spacers and O-Ring seals. Then the injectors are retested for leaks, spray pattern shape and atomization, fuel delivery volumes and correct electronic operation. When the operator is satisfied the the injectors are performing as a properly matched balanced set, they are ready to be returned to the engine. All results are recorded on the ASNU Service Report Pad.


The injector's performance is critical to the correct running of the computerised fuel injected engine. With a dirty injector like this one, problems can range anywhere from lack of power to poor fuel economy, hard starting to rough idling, even to poor derivability.



ASNU's patented ultrasonic cleaning process and variable cycle program cleans the inside of the injector to their original manufactured condition.