1992 Audi S4 AAN
PnP motronic VEMS
Siemens Deka 006 injectors
Bosch 044 fuelpump
Ran quite nicely with original coils (until last saturday). Now trying to get it to run Audi 1.8t coils, but one cylinder wants to stay dark. I have now measured my wiring with dvm, but can't find fault in wires. Even though, I'm inclined to blame my ready made harness I'm using for my coils.
Last night I debugged this further, and can't find any fault in my configuration. I don't have osciloscope available, so I can't check trigger pulse form. I can however see with dvm that I do get a trigger pulse on cyl 3, just as on other cylinders. Coils have been swapped around, and always it's cyl3 that stays dark. I'm pretty much stumped right now, and am going to buy new powerstage for my original coils. I have 1 new powerstage, and with that I can get motor running on 3 cylinders, so am hoping that with another new powerstage I can get it to fire on all cylinders.
Problem solved with another functioning powerstage and original coils. 3 spark plugs were harmed during this experiment