What you have mentioned below how does the AFM adjust on a 94 Disco Mk1.
Inside there is a solid circuit with a pot adjustment on the board which is accessed through the side.
I;m playing with it now but need some guidance - its running too rich / using too much fuel. They want an arm and a leg just to calibrate the AFM when there is only one adjustment.
Any advice
Thanks.
Std 3.5 pump is ok, no probs there. You need to use a decent CO meter though. Set fuel pressure to 42psi with engine not running and fuel pump relay shorted to allow it to run, prise cover off AFM and you'll see a plastic toothed wheel and a spring-steel locking catch. ease the catch back and tension the spring by turning the wheel roughly 6 notches, start engine and get to normal temp. Adjust idle mixture screw to 1 turn out from fully home then re-adjust spring tension to get a CO of approx. 1.8%, then fine-trim mixture with CO adjusting screw. Finally, re-seal cover onto AFM. That's what I did when going from a 10.5:1 3.5 with a Piper 270/110 cam to a
9.35:1 3.9 with a std cam, it worked perfectly for me. Badger.