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ignition pulse wire for 85-87 mpfi
Posted 28 November 2003 - 02:41 PM
my diagram shows a wire from the negative of the coil going to the computer. its supposed to be straight yellow. my engine harness has no yellow wire, just striped ones. also the diagram says it will change to a shielded wire:-\
i need to know what color this wire should be. close to the computer. maybe this is too vague, i just gotta figure where to hookup my ignition pulse. i wuld hate to give power to my ground side of the coil.
Posted 28 November 2003 - 03:05 PM
the 87 uses the crank angle optical disty, wheras 85-86 uses a mechanical tyoe with stand-alone knock control unit.
the shielded wire has a gray sheath, i think the middle wire id red?
what does the distributor look like?
Posted 28 November 2003 - 03:10 PM
i have got power to all the stuff that needs 12 volts, so i think ALL i need now is the correct igniton pulse wire, and its loud time. i only have part of the harness, so i am runing the wires that i dont have.
i was thinking it had to be that grey one
Posted 28 November 2003 - 03:19 PM
Posted 29 November 2003 - 11:31 AM
Posted 29 November 2003 - 12:19 PM
the braided portion i think would ground to the distributor or something, but its not the computers ground. its the middle sheathed wire that will be the signal wire.
the ecu i have exp. with was only gutted out. i havent hooked it up, because we couldnt get the flexplate bolts out to swap the motor to a flywheel.
i have fried mt nintendo by jumping the contacts on the cartridge to get the screen to do crazy tricks
i thought i have fried mt computer swapping drives when it os on, but it was an internal breaker in the power module, and everything checked out.
i have a spare ecu for 87 turbo if there is a way to get it to you should you fry yours. keep me up on your progress......
Posted 29 November 2003 - 12:23 PM
Posted 29 November 2003 - 03:15 PM
if i told you what i THOUGHT i knew, one of our 2 favorite board mermbers would jump my rump roast about it.
i will have to leave that one alone
Posted 29 November 2003 - 09:03 PM
As Miles said, the shield is a braid like that of co-axial cable, and is usually just under the outer jacket of the wire/cable.
You only need one end of it grounded. If you ground both ends, you will induce noise into the wire, not eliminate it. You don't want noise in the wire, gives false signals to the ECU.
Been studying the wiring diagram I have for the '88 XT-6. It is different than what you have, as far as the coil wires go, but I don't believe that you want to ground that Black lead that you mention.
But I have been wrong before.
Posted 30 November 2003 - 10:04 AM
the shield went right into a connector, that i assume had a wire on the other side that went to ground. so i grounded the shield, and then i put the wire inside of that one(turned out to be black), onto the negative side of the coil. so cold my damn soldering gun isng getting hot enough. im gonna go turn it over and see if i can get any signal to the fuel injectors. i do have spark, and fuel pressure!
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