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Alright so this is my first Datsun. Bought it about two weeks ago and how I assumed I got a deal on it I was quickly reminded of why I hate buying modified cars. I'll explain it like this: It's a 73 240z, I bought the car from a guy who said that the car had already been l28et swapped. He told me it used to run and that the cam gear had sheared off the previous motor and that he had just put this motor in he found in a savage yard from a 83 280zx turbo, and explained that he didn't have time for it anymore because he had another project he was too busy working on. I quickly looked over the car. saw it had a P90a head so I figured sure its a turbo head atleast, the car was low on rust, and the man seemed honest enough. Well I got the car home on a trailer and started looking over everything. Started well enough but would act weird above 2500 rpm. I started look at everything and realized that the O2 wire wasn't going anywhere. So I started looking for the male plug in for 02 sensor. Can't find it. I start wondering if I'm blind and start looking up diagrams to see if I can find what color wire it is to see if somehow the wire got placed somewhere else by accident and somehow itd still start. I finally got frustrated enough to check the ECM and found the tag: Part no.: A11-600-000 Lot no.: 5Z12 For: L28 Boom. I look it up and from what I can tell the ECM is for a 75-78 NA l28 and then I start looking and come to find out these don't have O2 sensors (never had a car that wasn't carbed and didn't have a oxygen sensor)?? This is where I start to get lost. I am beginning to think that the car was a l28 swapped car when he bought it. no turbo and this guy just threw a turbo l28 engine in it thinking he could just do that. plug everything in and "yay, I've got a turbo car" when he realized lifes not that easy he sold it. Okay so.... That ECM Part no. is that specifically for a 75-78 l28 non turbo car? Did they have oxygen sensors or not? How can I tell what the AFM is for? Whats the differences in the harness between a 75-78 l28 non turbo harness and a 83 l28et? If this is a AFM and a ECU for a NA could I just throw a header on this engine and call it a day or would this be hell to make work with this ECU or what? Anything could be helpfull. I know this is a very open ended question in a way and I realize I am a noob and I did search but I am so confused with what I have at this moment I'm alittle lost on what even to search for... Thanks for anything.
