Resolved 90 to 91+ Ignition Swap

[CrazyM]

So I'm doing the swap from my '90 'crap' to the newer style ECU, Power Transistor, and Coils (Went with COP)

First question, after completing the wiring to swap, will not have switched pins 6 & 14 not let my car start? When I turn the key to 'On' the stock boost gauge does do its recognize thing. I know for a fact it is a working ECU.

Also how are COP set ups supposed to fit, mine seems almost as if you just have to line it up, and push it down while trying to screw the screws into place.

Has anyone ever done this swap, or have any info\tips on it.

PS. I've been 'following' this write while doing the swap... 90 to 91+

EDIT: Also according to that write up there is supposed to be 4 wires left over?

 

[HIGHPSI4]

1990 crap? Never heard of that one. You need to check all of your wires to make sure all connections are good and the right wires were switched. Sounds like one wire is wrong.

 

[turbo90gsx]

You will also need to change tachs. The 90 reads ignition pulses differently than the 91. The 90 ignition system is not lesser than the 91+ is it just different. If all your doing the swap for is to be able to plug in the COP just re-wire the "tachometer" black box that was on your 90 coil pack in with the coils.

 

[spoonman]

This is the 90 to 91-94 ecu swap that you should be using the other method is outdated.

http://www.dsmtuners.com/forums/art...4-ecu-swap-into-1990-dsm-ignition-wiring.html

 

[CrazyM]

By crap, I only meant the little differences in years. Not that it is inferior, just a pain in the ass to find parts sometimes. That sort of thing.

I'm getting spark out of every single coil pack, so I assumed all my connections were good. Just the exact fitment of the COP set up I was unsure of.

I'd hate to have to backtrack all my steps and start going the route of the link.

Well got it figured out. Thanks for the bits of info guys.

Turns out I was looking at the plug from the wrong direction and had 2 wires hooked up backwards. Still got spark but not what was supposed to be there.

 

[mitsubishikid]

Match the wire colors, You simply omit the white tachometer wire top left on 90 coil connector stock 90 tachometer will not work unless you wire in a 90 tach filter into the adapter.

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[mitsubishikid]

If you happen to have a lifetime supply of "89-"90 early coil packs hanging around, but own a "91-"94 1g dsm and are trying to run a "90 you can make this handy adapter.

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[mitsubishikid]

Match the wire colors, You simply omit the white tachometer wire top left on 90 coil connector stock 90 tachometer will not work unless you wire in a 90 tach filter into the adapter.

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Oops got a problem with post #6 I was making an early draft of this, if admins could delete post #6 or correct it with the photo below I think I must have inverted the image by mistake the wiring is all wrong, this is the correct pin assignment for a "89-"90 coil to "91-"94 adapter

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[jed344]

I have not done this exact thing you are but I do recall from years ago putting a 91+ ecu in a 90 DSM we had to invert and change a few things, even then the tach never worked correctly but link would display the correct rpm.