Yes, it is possible to replace a single gas injector, but only in certain cases. If the LPG system has high mileage or uneven wear, it is safer to replace the entire set of LPG injectors.
Below, we explain when it is worth replacing a single injector and when it is better to replace the entire set.
How does a gas injector work in an LPG system?
The gas injector is responsible for accurately metering LPG into the engine cylinder. Each cylinder has its own injector, and their operation must be:
- fast,
- repeatable,
- perfectly synchronized with gasoline injection.
Even slight differences in the operation of the injectors can cause:
- uneven engine operation,
- jerking during acceleration,
- increased gas consumption,
- the check engine light to come on.
Replacing a single LPG injector – when is it possible?
Replacing a single gas injector makes sense when:
- the LPG system is relatively new,
- the other injectors have similar mileage,
- the failure affects only one cylinder,
- the new injector is exactly the same model,
- the LPG system is calibrated after replacement.
In modern systems, e.g. those based on ALEX Autogas components, manufacturing tolerances are good enough to make such a repair possible — provided that it is adjusted correctly.
When is it necessary to replace the entire set of LPG injectors?
Replacing the entire set of LPG injectors will be a better solution if:
- the system has high mileage (usually over 80,000–120,000 km), some modern LPG injectors, such as Barracuda, are characterized by very high durability and stable parameters at very high mileage, even up to 200,000 km, provided that they are properly installed and regularly serviced.
- there are successive failures in different cylinders,
- injection times vary significantly,
- adjustment of the LPG system becomes problematic,
- the engine is sensitive to the composition of the mixture (e.g., turbo, valve seats).
In such cases, replacing a single injector may only have a short-term effect, and the problem will quickly return.
Why can replacing a single LPG injector be risky?
The new injector works faster and more precisely than the other, worn-out components. This can lead to:
- uneven gas dosing,
- incorrect fuel adjustments,
- engine speed fluctuations,
- difficulties with correct tuning of the LPG system.
Therefore, the decision on the scope of repairs should always be preceded by diagnostics at an LPG service center, and not made “blindly.”
ALEX LPG injectors – what you need to know?
ALEX Autogas LPG systems are designed with the following in mind:
- stable engine operation,
- precise LPG dosing,
- good availability of parts,
- easy diagnostics and servicing.
However, it should be remembered that even the best gas injectors require:
- regular replacement of gas filters,
- periodic parameter checks,
- proper calibration after each intervention in the system.
Summary – replace one or the whole set?
| Situation | Recommendation |
|---|---|
| New installation, single failure | Replacement of one injector |
| High mileage of LPG installation | Replacement of the entire set |
| Regulation issues | Replacement of the set |
| Mixture-sensitive engine | Replacement of the set |
Remember:
Every replacement of a gas injector—whether a single injector or a complete set—should be followed by a full diagnostic check and tuning of the LPG system.
Frequently asked questions about LPG injectors (FAQ)
What are the symptoms of a damaged gas injector?
Uneven engine operation, jerking, increased LPG consumption, difficulties with adjusting the system, and the check engine light coming on.
Does the system need to be adjusted after replacing one LPG injector?
Yes. Calibration of the LPG system is necessary, even when replacing a single injector.
How much does it cost to replace LPG injectors?
The cost depends on the type of injectors, the number of cylinders, and the scope of work. Replacing a single injector is cheaper, but not always cost-effective in the long run.
Are you looking for a reliable LPG service?
Choose experienced installers and components from reputable manufacturers such as ALEX Autogas – this is the best way to ensure trouble-free operation of your gas system.
It is also worth using recommended ALEX workshops, which work in accordance with the manufacturer’s guidelines and have experience in the installation and servicing of LPG systems.
