Lucas Petrol Injection
An explanation of the Lucas mechanical petrol injection system as fitted to the Triumph TR5 and TR6 — how the metering unit, pump and injectors work together, and what to look at when things go wrong.
Reference library
Technical Articles
Scanned manuals, bulletins and reference sheets kept together in one place, alongside notes on what each document is and when it applies.
The TR5 PI came out of the factory with a mechanical fuel injection system that few workshops ever saw, and much of the useful literature has only ever existed on paper. The documents gathered here are scans of that material — factory publications, service bulletins, system manuals and notes passed between owners over the years.
Every document opens in your browser to read. Scans vary in quality depending on the condition of the original. If you have paperwork that belongs in this library, or a better copy of something already here, please get in touch.
Petrol Injection
Triumph Lucas Petrol Injection — Service Training Notes
Factory service training notes on the Lucas petrol injection system: system layout, operation, servicing procedures and settings used in dealer training.
Fault Card 1 — Primary Fault Check List
The starting point for any PI fault diagnosis: the primary check list to work through before chasing individual symptoms.
Fault Card 2 — Engine Will Not Start
Diagnosis routine for an engine that will not start.
Fault Card 3 — Excessive Fuel Consumption
Fault diagnosis for excessive fuel consumption.
Fault Card 4 — Misfiring or Cutting Out
Diagnosis for an engine that misfires or cuts out.
Fault Card 5 — Erratic Idling and Lack of Response
Diagnosing erratic idling and poor throttle response.
Fault Card 6 — PI Metering Unit: Fitting and Tuning
Fitting and tuning the PI metering unit.
Lucas PI Fault Card — Fault Diagnosis Check Sheet
The overall check list sheet used alongside the fault cards.