Triumph Wedge Owners Association
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This content originally published at our WWWedge site, on the Wedgelabs page(s) developed by Gene Thompson, and hosted at team.net.  Gene Thompson retains all copyright for the material below, except where noted.

The Lucas 4CU ECU in fuel injected TR8s, Rover SD1s and euro Range Rovers has a pretty bad reputation. Well, OK - a really bad reputation. But the dirty little secret is that the vast majority of ECU failures can be remedied in a few minutes with no need to send it away to have it expensively 'rebuilt'. With a little care, common sense and this guide you can probably do it yourself - but you don't have to, as the TWOA will repair and test your TR8 ECU for members, for the cost of shipping (both ways). With the money you save, you can buy some decent tools.
PictureClick image to open file (adobe pdf)

The PDF on the left has complete schematics and circuit board layout diagrams along with numerous other charts and graphs. I included a few repair tips and some simple performance modifications. Combine those simple mods with a rising rate fuel pressure regulator and you're in business without hacking the EFI system to bits!

Click on the picture at the left to open the pdf file which has extensive details on the operation, troubleshooting and repair of the ECU.

If after reading all this, you're not comfortable with your soldering skills, contact us.  If you are a TWOA member we will
repair and test your TR8 ECU for free - certainly much cheaper than any other services offered elsewhere.


​Triumph Wedge Owners Association (TWOA)
TWOA is an Affiliate Chapter of the Vintage Triumph Register
  • Home
  • About/Join
    • Club Benefits
    • Sample Newsletter
    • Join or Renew Online
    • Join or Renew by Mail
    • Board of Directors
    • Bill Sweeting Remembered
    • Contact Us
  • Tech/Parts
    • Articles >
      • FASD Technical Specifications
      • Fuel Injection >
        • The TR7 ECU - Bosch
        • The TR8 ECU - Lucas
        • Heated O2 Sensors
        • Inside an FI Tank
        • Noid Test Light
      • Members Only Articles
      • TR7 4-Speed Overdrive Conversion
      • TR8 Cooling Fan Circuit
    • Dealer Documents >
      • Memos
      • Recall Campaigns
      • Technical Service Bulletins >
        • A - Engine
        • B - Electrical
        • C - Body
        • D - Transmission
        • E - Paint
        • Z - Recalls
        • F - Chassis
        • G - Miscellaneous
        • H - Air Conditioning
        • TSB Numbers Decoded
      • Training
      • Service Tools
    • Model Information >
      • Brochures
      • Deciphering The Wedge >
        • Component Serial Numbers
        • Paint and Trim Codes
        • VIN and Component Serial Number Locations
        • VIN Numbers Decoded
      • Labels and Decals
      • TR7 Special Editions >
        • Limited Edition
        • Spider
        • Southern Skies
        • 30th Anniversary Edition
      • TR8 >
        • BL Motorsports: Hurdwell Memo
        • California Air Resources Board Emissions Certifications
      • Wedge Colours
    • Parts Suppliers
    • Cottage Industry Parts
    • TWOA Parts
    • TWOA Tool Rentals >
      • TR7 Head Honcho
      • TR7 Head Honcho in Action
      • Fuel Injection Tools >
        • Gizmo
        • Looking Glass
  • Resources and Services
    • 2021 Wedge Calendar
    • Reproduction Suggestions
    • Cars For Sale
    • Cars Wanted
    • Parts For Sale
    • Parts Wanted
    • Harris Mann Art Prints
    • Mailing List Archives
    • Mailing List, Forums & Clubs
    • Gems: TR8CCA+WWWedge
    • Tech: Best of the Web
    • Wedge List Files
  • Events
    • Calendar of Upcoming Events
    • 2020 TWOA Virtual Car Show Results
    • Past Event Photos >
      • Britain on the Green 2015
      • The Kastner Cup 2015
      • Triumphest 2014
      • VTR National Convention 2014
      • The Gathering Dobson NC 2013
      • Dobson The Gathering 2012
      • South Central VTR Regional 2012
      • Triumphest 2012
      • Maryland British Car Day 2011
      • Dobson Gathering 2010
      • Roadster Factory 2010
      • British Invasion 2009
      • Roadster Factory 2009
    • VTR National Awards History
  • Members
    • 2019 Directory Corrections
    • Newsletters
    • TWOA Parts Store
    • Sun Visor Information
    • Regalia
    • Official TWOA Documents
    • FI hose replacement
    • FASD Photos
    • Rear End Spring Experiment
    • Bushing Tests
    • Bushing Buddy - Installation Tool
    • Odd's Engine Removal Tools