Lorenfb

"Yes...we got one of those too. An 85 brain...which was promptly fried by the same offending fuel injectors that fried our stock brain."

There's no current limiting function on the output injector driver for the 928 LH ECM as on
some other Bosch ECMs, e.g. 911/944 Motronic. So, one must be careful in changing injectors,
i.e. the peak injector current for all injectors must be less than 15 amps, ideally 10-12.

Thus: Resistance of each injector > 14 volts / 12 amps X 8 ~ = 9 ohms

Note: The stock 928 injectors are about 16 ohms (WKD 493.421 - pg 2-05).
So for overall conservative operation, the injector resistance should be > = 12 ohms.

1bgdog

i just had a LH fuel injection module rebuilt by Electronik Repair out of Mesa Az. and Rich was a major help sent me all kind of tips and things to check out before i even bought it and also offered to send me one out to test to make sure that was the problem that was it overnighted it to me had the next day for $650 and i am back on the road again hats off to Rich toooooooooooo bad there arnt more people out there like him he wasnt out to just make a buck he really wanted to help me out

THANKS

MBMB

The entire PET is downloadable from somewhere. Attached is the page that I found with LH and ignition control unit part numbers.

FlyingDog

The PDF version is on Porsche's website.