I need to change the resistor across the zener to 27k. I really think that will fix it. I had to haul a neighbors truck home when he broke down and I watched the mpguino running with the 25k and it didn't jump or do anything erratic at all. I didn't try on purpose to make it jump by turning on a lot of stuff at once so I think 25k is pretty close. 27k should be pretty much right in the safe spot so even if the alternator is disconnected the injector will probably quit firing before the mpguino quits reading.
Once I get it where I am happy with it I will stick it in the Metro and scope it out and see how it reads. I don't see any problem with it working just fine on a saturation injector with the resistor across the zener.
I will swap out and put a 27k in tomorrow. I figure if it works 99% with a resistor there is no point in getting really nuts about that last tiny bit of precision. Also I went from 19mpg empty to 14mpg with an extended cab ford ranger on the back
