Injection Systems
Lucas 4CU technical support.
Practical support for Lucas 4CU diagnostics, service planning and upgrade routes for classic and specialist applications.
4CU Scope
Diagnosis before replacement.
- Idle quality and fueling fault diagnosis support
- Injector, airflow meter and temperature signal checks
- Wiring, grounds and sensor-path validation workflow
- Service-first recommendations before replacing parts
- Upgrade route guidance for modern EFI conversion planning
Share the vehicle, engine, current symptoms and any previous test results and we can help you choose the right next checks.
Ask for HelpRelated ECU Families
Platforms we also support around classic and modern fueling work.
Alongside Lucas 4CU work, we support the following diesel and gasoline ECU families for diagnostics, bench checks and conversion planning.
ID Series (Common Rail Diesel)
- SID208: Common in modern diesel vehicles including Ford and Citroen.
- SID206: Used heavily in Ford models.
- SID803/SID803A: Common on Peugeot/Citroen 2.0 16V HDI 136 BHP engines, often requiring BDM100 access.
- SID307: Common in 1.5 dCi engines across Renault, Dacia and Nissan.
- SID202: Used in 1.8 TDCi Ford Focus applications.
- SID801A: Older Siemens diesel unit often seen in decoded or immo-off builds.
SIMOS & Related Gasoline
- SIMOS18.6: VW Group applications using Infineon TriCore processors.
- SIMOS10: Found in VW Group gasoline vehicles.
- SIMK31: Common in early 2000s Hyundai and Kia applications.
- PCR2.1: Widely used in VAG 1.6 TDI engines across Audi, Seat and Skoda.
MS Series (BMW Gasoline)
- DME MS42: Older BMW platform commonly handled via bench programming.
- DME MS43: Older BMW platform commonly handled via bench programming.
If you are combining legacy ECU work with injector or carburetor issues, we can help set a joined-up diagnostic plan.
