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I thought my AMM was bad but it was a stuck O2 sensor. If you pull the fuel rail and the coil wire , connect the grounds up that are held by the fuel rail bolts, put some rags down , turn the key like you are trying to start, then go look at the injectors. make sure they arent; stuck open and letting the fuel rail dump into one of the cylinders.. I had one that would not shut off..
the car would run pretty well once it cleared out all the gas from that cylinder.
I have also seen green connectors at that AMM plug and cleaning fixed it.
i tried using that AMM spray cleaner but later realized its' not supposed to be used on heated element ones, which you have. it never killed mine but maybe It's not recommended. I noticed you can buy the wire part from rock auto or you can exchange them for rebuilt ones. Sounds like yours is tested and proved ok and it's an expensive part to buy just to swap and see.
probably not your issue but have a look at the wiring to your TDC sensor it might be rough if never replaced. If that wire looks hardened up I'd replace that as well.. same with the old O2 sensor.. those two aren't too hard to swap out.
check any wires around the ignition , coil wires, the wires to the transistor ( power stage) all the spade connectors in that area. also grounds like the ones for the fuel injectors and any other grounds.. battery cables, I had a no start issue and the coil wires ( the ones that screw on and have brass spade connectors, the wires were ok but the bolts on the distributor got rusty and that was killing my coil ..
My 240 has an engine fues in that area on the DS innner fender, not sure if your car does but if you find a fuse or a holder in that general area, check the contacts.
It's possible to upgrade to carbs which was a much more reliable system but you need the old style manifold, carbs and distributor and you can use a smaller electric fuel pump and keep the in tank pump as is. my brother did 3 cars and ditched the ECU's , a bit less power but way easier to keep going. older cars with carbs experienced way fewer of these difficult to solve electronics issues. If you do that you may also need to think about how to make the speedo work.
the problem isn't so much that the electronics were badly designed, they just added a lot of complexity and from there forward almost every car made has problems of becoming unique due to the automakers redesigning them so frequently. Its good for the dealers because people get stuck and go spend money but it's also the reason I'd never buy a new volvo.
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