Freeze frame data without OBD2

I’m trying to do diagnostics on multiple Volvos with the same issue. It’s a severely intermittent stalling and hard start. Maybe once or twice a month goes away after dealing with it and driving the car anyway. The check engine light does flash as the car is stalling but it never manages to store the code. All of these cars are very up-to-date on their services and have had all the high mileage items are done on them like timing belts, injectors PCV breathers, fuel pumps, filters, all the engine management sensors, etc.

My current theories are that it’s weather related, although that could be a red herring . or that it’s some of these aftermarket parts not playing nice with each other.

Either way, I need some kind of system to get data from the injection and ignition ECUs as the issues are present. I’d rather not have to mutilate some scrapyard ECUs to make a connector for my pico scope.

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Originally posted on r/CarHacking — View discussion