Part numbers on the MPS & ECU would be handy. Is the MPS still riveted together?

Cam is wrong for compression.

The idle mixture on the ECU working suggests the throttle position switch is working. Staying with D, K or VV-61 cams generally means the ECU knob works fine.

Are the spark plugs BLACK when idling & driving below 3000rpm? Are you choking on fumes? I'm questioning the O2 meter, but it definitely sounds like your idle side is functioning.

Which screw are you adjusting, the little central one or the big bung?

Have you got a fuel pressure gauge fitted to know that the pressure is being maintained above 3000rpm?

Is the head genuinely stock? A well ported head coupled with a 2.125" or larger exhaust system will use more fuel than you can get out of D-Jet, but that shouldn't cause idle woes.

And I probably should have asked this 1st, but is the ignition system good?
10°@ Idle, progressing to 32° Maximum BEFORE 3000rpm & staying there.(I fitted a 2nd hand MSD unit once, all seemed fine, but the timing retarded progressively as it was revved up.)


How do you know it's a D cam? When I was a teenager I had a cam with 8 great lumps on it in my B18B. No guts, but it could scream. When I got a degree wheel & dial indicator it was 240°@.050" & .298" lobe lift, this is 20° bigger & no way would it ever work with D-Jet. Turns out it was a very good regrind of a good D cam without any other numbers punched in to it.