Well when I got the car unknowingly to me it had the wrong ECU in it.It had a 556 ECU installed😯the car is a 90 240 Dl wagon 5 speed btw.After let's just say a few people who call themselves mechanics told me I "needed an engine" I realized that I'm gonna have to fix this car my dam self,so thus started the shit abyss of LH 3.1 and how little it was used on 240s and the special parts needed for it,so I purchased an eBay 572 ECU because that's the right one so I was really starting to think maybe they used a different ICU,but you are right spark is spark.But furthur in the saga I have a 131 code in diagnostic port 2 for engine rpm signal missing and also a 144 code in Port 6 for load signal missing from LH unit.computer assumes the engine is at full load🤔I have already changed the crank sensor with a new burigord one idk if that's the right name but it was oem.The car runs great but has a higher than most idle and kinda "takes off"up to like 1500rpm then settles back at around 1000 plus looking at the check engine light makes me wanna break shit so I'm just looking down all avenues because what the in the funk else gives the ECU load signal than the Crank sensor? I know obd1 is a piece of work and just trouble codes in general but I want that check engine off and to stay off😤so yea really don't know what to do about that now.