EUI injector testing and repair
Electronic unit injector diagnosis, testing, rebuilds and calibration in our Auckland workshop, for trucks, heavy equipment, marine and industrial engines. Courier-in repairs from anywhere in New Zealand.
Why Simms for EUI injectors
- 01Diesel injection specialists
In business since 1927.
- 02Tested and calibrated
Bench testing and calibration equipment sets every injector to manufacturer specification.
- 03Built around downtime
A structured repair process to keep trucks, plant and machinery running.
- 04Verified before it leaves
Every EUI injector is tested before it goes back to you.
Losing power, smoking or idling rough?
EUI faults can cause hard starting, power loss and uneven running under load. Because EUI systems control fuel delivery electronically and mechanically, bench testing is essential before replacing parts.
Common signs your EUI injectors need testing
- Hard start or no start, even with good fuel supply
- Loss of power or poor throttle response
- Black or white smoke under load
- Rough idle, misfiring or surging
- Higher fuel use
- Injector-related fault codes
How we service EUI injectors
- 01Inspect and bench test
Electronic and mechanical testing confirms the fault before any work starts.
- 02Strip and rebuild
Internal parts inspected and worn components replaced to manufacturer specification.
- 03Calibrate and verify
Each injector is calibrated and checked for fuel delivery and timing before it leaves.
Request an EUI injector test or repair
Tell us the engine, injector type and symptoms. We'll recommend the most cost-effective option after testing, and usually reply within one working day.
EUI injector questions
Another question? Call +64 9 579 1159.
How long does EUI injector repair take?
It depends on injector type and parts availability. Most testing and rebuilds take a few working days, and we confirm timing once bench testing confirms the fault.
Can I courier my injectors to you?
Yes. We take injectors from workshops and fleets across New Zealand. Pack them securely and contact us for shipping guidance.
Which EUI brands do you service?
A wide range, including Bosch, Cummins, CAT, Detroit, Volvo, Scania, Perkins, Delphi, Denso and Stanadyne. Unsure? Send us your engine details.
Do you test before repairing?
Yes. Every EUI injector is bench tested electronically and mechanically before any repair work starts.
Do you offer exchange injectors?
Where available, remanufactured or exchange units can reduce downtime. It depends on the engine and stock.
Where is the workshop?
77 Leonard Road, Mount Wellington, Auckland 1060. Monday to Friday, 8am to 5:30pm.
Other workshop services
Need a part as well?
We hold far more diesel parts than we list online. If we don't have it, we can usually source it.