el101bob wrote on Jul 17
th, 2008 at 11:29am:
1989 BMW 325i with Turbo M20
MS-II Extra January 5th, 08 revision
MS-II v3.0 PCB
Single VB921 with stock coil and distributor ignition system
2.5ms Dwell
85lb-hr Low-Z Injectors
Scosche Injector FET Mod
I'll take it for a drive and try and get a datalog and msq.
I would say for the kind of vehicle you've got set up there and the kind of diagnosis you are looking to do that you may need to make use of a DSO (digital storage oscilloscope).
I would recommend making and sharing the following captures:
- Primary ignition coil current, primary ignition coil drive, and enough time to show all the cylinders during the misfire (with a cylinder trigger)
- Secondary ignition pattern with all cylinders during the misfire
- Injector current waveform (preferably at a common point like a fuse or harness), injector drive, and enough time to show all the injectors during the misfire (with a cylinder trigger)
I would also like to know what the firing order is. If you have access to a gas analyzer, I would recommend recording the readings during the misfire and sharing those as well.