LPG Injectors: Types, Service Life, and When to Replace

LPG injectors are critical for your autogas system, precisely metering fuel into the engine. When they function correctly, your vehicle runs efficiently, maintaining the 35-45% fuel savings LPG offers. This efficiency contributes to a payback period of typically 10-18 months on your conversion, often faster for high-mileage drivers like taxis. Like any component, injectors have a service life and can develop issues.

Injector Function and Types

In a 4th generation sequential injection system, the most common type we install, injectors precisely meter vaporized LPG into the engine’s intake manifold. This ensures the correct air-fuel mixture, directly impacting performance and fuel economy. These systems also incorporate at least two safety levels, an automatic gas shut-off, and a multivalve for added security. For modern direct injection engines (GDI/TSI/FSI) and turbo vehicles, 6th generation liquid phase systems use injectors that deliver LPG in its liquid state. We use certified components from leading brands like Alex, AC Stag, Lovato, Landi Renzo, Digitronic, and Tomasetto, selecting specific injector types to match engine requirements and ensure optimal performance.

Injector Lifespan and Maintenance

LPG injectors typically last 60,000 to 100,000 kilometres. This lifespan depends on factors like LPG fuel quality, driving habits, and consistent system maintenance. Regular checks, part of our maintenance services, can identify potential issues early, extending the life of your entire autogas system and preserving your fuel savings. Remember, since 2023, LPG conversion registration with Transpordiamet (Transport Administration) is mandatory in Estonia, highlighting the importance of a well-maintained and compliant system.

Recognizing Failing Injectors

Failing LPG injectors typically present clear symptoms. Look out for:

• Engine misfires or rough idling: Often more noticeable on LPG, indicating uneven fuel delivery.
• Loss of power or hesitation: Your vehicle may feel sluggish during acceleration.
• Increased LPG consumption: A sudden drop in fuel economy without changes in driving style often points to faulty injectors.
• ‘Check Engine’ light: This warning can appear with diagnostic codes related to fuel trim or misfires.
• Difficulty switching to LPG: The system might struggle to transition from petrol, or the engine could stall after switching.
• Unusual noises: A louder or irregular clicking from the injector rail area suggests an issue.

Diagnosis and Replacement

If you observe any of these signs, a professional diagnostic check is essential. At GBO Eesti, diagnostics cost 40 €/h to accurately pinpoint the problem. Our experienced technicians use specialized equipment to identify whether an injector needs cleaning or full replacement. While some injectors might benefit from cleaning, significant wear or internal damage usually requires replacement. A faulty injector not only reduces performance but also stresses other engine components, undermining the 35-45% fuel savings you expect. We use only certified parts from trusted brands like Alex, AC Stag, and Lovato for replacements, ensuring compatibility and long-term reliability. Repair labour is 40 €/h. Post-replacement, precise system calibration is crucial to restore optimal performance and fuel efficiency, ensuring your autogas system continues to deliver consistent savings and comply with all regulations.

Don’t let injector issues compromise your vehicle’s performance or fuel economy. For a thorough check-up or repair, visit GBO Eesti at Magasini tn 31b, 10138 Tallinn. You can reach us directly at +372 5619 8765 or review our service prices online.