Engine
What are Fuel Injectors?
Spray a fine mist of fuel into the engine.
Simplified animation — not to scale.
In plain English
Precision-engineered nozzles that open and close thousands of times a minute to spray atomised fuel into each cylinder (or the intake) at exactly the right instant.
A simple analogy
"They are like the engine's perfume atomisers — a tiny, perfectly timed spritz of fuel for every bang."
How it works
The ECU tells each injector when and how long to open. The finer the mist and the better the timing, the cleaner and more efficient the burn.
Signs of trouble
- ⚠Misfires or rough running
- ⚠Smell of fuel
- ⚠Increased fuel consumption
- ⚠Black smoke from the exhaust
Rough UK cost
£200–£1,200 depending on number replaced
Parts: £60–£300 per injector
Labour: £100–£400
Always get a written quote. Prices vary by car, region, and parts brand.
Heads up: Carautonomy is for general guidance only. If your car is showing warning lights or behaving oddly, get it looked at by a qualified mechanic.