Air conditioning, heating, climate control
Delanair Mark II Climate Control Dealer Training Aid  (In progress.  Needs images and proofreading.)
Air Conditioning schematics rescued from skjagtech.co.uk
Heater Modifications
When the A/C compressor does not engage, check the Air Conditioner fuses

Brakes
Hand brake and Rear brake calipers
Rear calipers
Video showing brake caliper removal on an XJ6 without dropping the IRS.  Note that the caliper fails to cooperate.  This file is huge, 44,471,816 bytes, so it takes a long time to load!

Cooling system and Fans
Auxiliary cooling (radiator) fan checklist
Modify the electric (auxiliary) fan to run whenever the A/C compressor engages ("Diode Mod")

Cruise control
Cruise Control Troubleshooting and Description Microsoft Word (DOC) format or HTML format - Tom Graham

Electrical: fuses, switches, wiring diagrams
Download Tom Jenkins' (xj tom)'s wiring diagrams for XJ6 Series 1 and 2 in PDF format or in Doc format,
or the Series 3 diagrams in PDF format or in Doc format
For best results, you should print these using a color printer loaded with A4.
Here's a preview.  Click to enlarge, then use your browser's BACK button to return.
     
Modify the electric (auxiliary) fan to run whenever the A/C compressor engages ("Diode Mod")
Air Conditioning schematics rescued from skjagtech.co.uk
Fuel injection wiring diagram
Fuel Pump Circuit Checklist
Fuse locations
Headlight Circuit Checklist
Horn Circuit Checklist
Publication S 57 wiring diagrams Revised 7/88
Turn and Hazard Signal Switches
Windshield Wiper schematics
Window Relays

Engine
Rough idle checklist
Oxygen Sensor Test Information & Resetting the Warning Light
Stakedown Kits  (Coventry West tech tip)
Tune up Procedure - XJ6 4.2 Liter Fuel Injected Models - John McKeel

SKJagTech
List of stuff rescued from skjagtech.co.uk

Engine starting problems
No Spark Checklist
No Start Checklist

Fuel system: Injection, tanks, valves, troubleshooting
Air Flow Meter (AFM) calibration
Auxilliary Air Valve test
Cold Start Circuit Checklist
Cold Start Overfueling, also known as the Capacitor Mod
Testing the Coolant Temperature Sensor
Fuel Injection and the Jaguar XJ6 4.2 Series - Roger Bywater
Fuel injection wiring diagram
How to Diagnose a rich fuel mixture problem
How to Remove Fuel Injectors
How to Clean the Fuel System
Fuel Pump Circuit Checklist
Fuel Tank Switchover Checklist
XJ6 and XJ-S Fuel tanks (Coventry West tech tip)

Gauges and trip computer
Replacing the Fuel level sender
Jaguar XJ6 Trip Computer Details - Duncan Brown
How to repair your Trip Odometer

Ignition
The Ignition Amplifier on the bench

Miscellaneous (stuff we're at a loss to classify)
Birds and paintwork, advice for preventing and removing stains
Experience In A Book (in progress) - Kirby Palm
Download some Jaguar manuals
Oxygen Sensor Test Information & Resetting the Warning Light
R & R rear window motor
Vehicle Identification Number information (for non-USA vehicles only?)

Photo gallery
Hood latch ("Bonnet Check" and "Bonnet Stay"), Trunk lock and Fuel lines in the trunk. Thermotime switch photographs

Rear end (IRS)
Enter "IRS" site:www.thegaragegazette.com into a Google search prompt for some excellent information about Independent Rear Suspension (IRS)

Searching the web for answers and help
Using Bing, Google or Yahoo! to search the internet is frustrating.  jag-lovers.org has a search page, but it is also frustrating.  You should be logged in to use it.

Regardless of which search engine you use, you should use Firefox as your web browser because the Adblock Plus add-on for Firefox will correct a problem wherein display of the results is otherwise nearly illegible.  Adblock Plus does two terrific things; it supresses the display of unwanted advertising and it cleans up jag-lovers.org so that Firefox can properly display those pages.  Instructions and suggestions for setting up Adblock Plus are here.