Fuel Injector Cleaning & Replacement
Also called injector cleaning
Injectors spray a measured mist of fuel into the engine, and deposits distort that spray so cylinders run unevenly. Cleaning on a bench, with flow and spray pattern testing before and after, shows honestly whether each injector recovered. Injectors that fail the test are replaced. This work helps rough idling and misfires caused by injectors; it will not fix misfires from worn spark plugs, coils, low compression or a vacuum leak.
What the job includes
- Fault codes and live fuel trim data read before any work
- Injector removal with new seals and O-rings on refitting
- Flow rate and spray pattern test before cleaning
- Ultrasonic cleaning and back-flushing
- Post-clean flow test with results shown to you
- Replacement of any injector that still fails the test
Signs you need this
- Rough or uneven idle, especially when cold
- Hesitation or stumble when accelerating
- Misfire code stored for one or more cylinders
- Fuel consumption has risen noticeably
- Strong petrol smell or black smoke from the exhaust
- Engine runs unevenly after long periods of city driving
Not all of these have to be present, and one of them on its own can mean something else entirely. That is what the diagnosis is for.
How we do it
Read the data
Fault codes and fuel trims are recorded so the injectors are not blamed for an ignition or air leak fault.
Test before cleaning
Each injector is flow tested and its spray pattern photographed so you can see the starting condition.
Clean in ultrasonic bath
Injectors are cleaned in an ultrasonic bath and back-flushed to remove deposits from the pintle and filter.
Retest and decide
Flow is measured again; any injector still outside tolerance is replaced rather than refitted and hoped for.
Refit and road test
New seals are fitted, the engine is run for leaks, and idle quality is confirmed on the road.
How we work
The same on every job, which is why we can write it down.
Diagnosis before quote
We find the fault first. A price given over the phone for a noise nobody has heard is a guess.
The price is agreed first
You approve the work and the cost before a spanner is picked up. Extra work means another call.
Parts you can check
We tell you whether a part is genuine, OEM, aftermarket or used, and what each one costs.
Old parts returned
Ask and we will hand back whatever we replaced. It is the simplest proof that the job was done.
Book fuel injector cleaning & replacement
Fill this in and a person will call you back to confirm the time and the price. Only your name and one way to reach you are required.
Before you book
Questions we get asked
If your question is not here, ask it. We would rather answer honestly now than have you find out after booking.