Fixxin an ecu

[Demon1024]

Anyone know which part on the board controls the injectors? i'm not super electronically adept so i can't figure it out by looking at it tracing the lines/wires,but i can solder and have another bad ecu so i thought i'd ask. i fried a port on my ecu for the #4 injector when i wire my 87 up to an 88 motor and ecu. can anyone help me on this. maybe a diagram of the board it self?

[cygnus x-1]

If you have a picture of the component side of the board I might be able to locate the likely components. There should be some larger switching transistors that drive the injectors.

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[Demon1024]

I don't know what that looks like maybee you can help. sorry my camera not too good at close pics
http://a384.ac-images.myspacecdn.com/images01/23/l_a4bd3184b57860f4588a5a5f56fc3aa7.jpg
http://a814.ac-images.myspacecdn.com/images01/49/l_ea2b133383236f730008a504e2fe9945.jpg
I'll see if i can find better pics somewhere

[cygnus x-1]

At the very top of each of the pictures, it looks like there are some power transistors mounted to the case. They should each be about 3/8" square with a metal tab on top and three legs. There would be 4 of them and they will all have the same part number on them. If you see what I'm describing, what are the numbers on those transistors?

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[Demon1024]

the part thats conected to the out side of the case with three screws?
it's the only ones i see with three legs but there's six of them they say 327 on them

[cygnus x-1]

Yes, those are power transistors. They're mounted to the case in order to dissipate heat. Those are very likely the drivers for the injectors. You should be able to trace the individual injector pins on the main connector back to those parts. Is "327" the only number on them? Are there any symbols maybe? "327" isn't an industry standard part number, it sounds like some OEM part number. But if you have a spare ECU then you can try swapping those parts. If you try this be careful when removing the old parts. They can be difficult due to the heat sinking action of the traces on the board. If you leave the iron on there too long it can lift the traces off the board, which makes for a bad time. Some desoldering braid will be helpful, or a desoldering iron or solder sucker.

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[Demon1024]

thank you i'll give it a go this weekend