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Hey folks, Turns out long time lurker 1st time poster. Figured this would be the place to go with a pretty specialised problem as the m4.4 people are here. Backstory: This is the car I've owned for 12 years now: it's not super sexy but it's mine. i have a 164TE, 1800E, 2 C202s and another almost identical 850 except a wagon (very early production 93 model also) It started life as a 2.0 20V auto which is not bad if you're prepared for the tacho to visit 3PM frequently but through circumstance I got a B5254S and an M56 from a 2.0 (4.45 final drive) and that made the car actually faster than I anticipated. I drove it like that for 6 years but the engine was tired and blowing more smoke than I was comfortable with. About 3 years ago a valve chipped so I threw another head on and drove it for another year but then the week before I was scheduled to fly out to Australia for 2 months it chipped another valve and so I decided the time had come. I already had a B5244T3 sitting aside and I had already rebuilt a 16T turbo for it so last summer I finally put the car on blocks in the backyard and ripped the engine out. Over the winter I did a stage zero on the B5244T3 and rebuilt the steering rack while I had the subframe out to fix a leak and also got access to a full 98 xc70 so took everything relevant to the M4.4 setup from it and worked it onto the B5244T3. Finally, this May just gone I had everything ready and started putting the car back together and after working slowly on it the past 2 months On Thursday I was finally ready to turn the key for the 1st time. My 1st actual attempt to start it failed and so I did checks and the 1st thing I found was that the injectors only pulse for about a second before turning off but then when I release the key an injector or 2 fire once. This happens every time I crank. I tried several very short cranks and the car actually fired up! I ran it for about 20 mins and after about 5 mins the lambda light came on but there's no surprise there as there are no o2 sensors yet as there is still no exhaust and the ecu is an auto one so that might also have thrown the code but the car did run for about 20 mins but then i turned it off and so far haven't been able to get it running again. This is how the engine bay looks right now: So, I think if you've read this far you can probably figure what my question is but I'll ask anyway: Would anyone have an idea what's going on? To recap, when the car is cranking, the injectors fire for maybe a second then stop but then when I stop cranking an injector or 2 may fire again. I've checked power to the ecu and on cranking I get 10.4V which I guess should be enough and I cleaned all of the contacts between the battery and ecu quite well so I don;t think it's an issue of power. Things I'm about to do are check spark to see if I lose spark too or just injectors and then maybe throw a cam sensor and crank sensor in desperation but I'm hoping someone has either encountered this before or has enough of an idea of how the M4.4 system works to help me figure this out. BTW I do have a video of it happening but not sure how to post it here. But yeah, If you have any questions about converting a 2.0 NA auto car to a turbocharged manual then feel free to ask