Well, I've managed to get the Z tuned enough to drive around, but it is still pretty rich at idle and light throttle driving. I decided to use an "enhanced" VG30DETT tune available from ztechz.net, since it is already designed for the use of the Z32 MAS. So, I just needed to recalibrate the K value, TTPmin, Void, TTPMax and TP scales to represent MB 480cc injectors. With that setup, it runs, but really rich overall, especially at idle and light throttle driving. So I decided to start trimming down the TTPMax and Void time. I now have the void time at 00hex and the TTPmax brought down considerable at the lower end and it now runs alot better. Basically, the lower I bring the void, the better the idle mixture. but now i have run to the end of the scale at 00hex. Oh, the AFM reads 1.5v at idle, 800rpms. I wonder what i can do next in order to bring the enrichment lower. Maybe start lowering the fuel enrichment on the actual fuel map, but that is something that I shouldnt have to do. There seems to be a variable in the M30 ECCS that I have not been taking into account as it should not be giving me this much trouble. I have begun to think that maybe the fuel injectors themselves are at fault, as if they are sticking or have slowed down their pintle movement over the past 30 years. I have had them cleaned and flowtested with the results all coming back good. And I know for sure that they are not tied together as with what happens during the injector recall campaign. Also, maybe there is a voltage divider circuit for the AFM, of which im going to look into more to find out for sure.
So I ran down the AFM signal trace on the computer board and came up with this.

The AFM signal and CHTS are tied to each other through a voltage divider circuit. But, the AFM signal goes straight to an A/D convertor. I may cut the trace on the AFM signal trace going through the 170Kohm resistor and see if that makes any difference.
So I ran down the AFM signal trace on the computer board and came up with this.
The AFM signal and CHTS are tied to each other through a voltage divider circuit. But, the AFM signal goes straight to an A/D convertor. I may cut the trace on the AFM signal trace going through the 170Kohm resistor and see if that makes any difference.
Comment