Coil plug conections (93 motor in a 90 car)

[DJDIGITALDEATH]

I am doing a swap of a 93 engine in a 90 body and just about have it complete except the differance in the coil plugs. the 90 body has a 4 wire plug and a 5 wire plug, where the 93 engine has a 3 wire plug in and a 7 wire plug in...

Does anyone know how to make this work or splice by matching wire colors ? I do have the two engine plugs that work with the coil from the old body. however even if i match all the wire colors there would still be 1 extra wire on the engine coil side.

Anyone completed this swap ?

any help would be appreciated..

 

[91talontsiturbo]

Man i'm in the same hole that your in. well not really a hole but my tach dosn't work.

Same concept though: 90 body with 93 moter

its possible for it to start up in run fine but with the exception of the tach not working

Heres a little background info: I bought this car about a month ago in just got it runing agin due to a broken 'ear' on the block where the trans bolts up wich i had welded back on, when i first started it, it ran fine but the tach wasn't working so i figured what the hells wrong now!
after lots of serching i also found that 90's have 4 prong connestors and 91+'s have the 3 prong ones. So i went out in looked at mine and it was a 3 prong connector wtf???? then remembered a long time ago the previous owner blew the old moter and put a new one in and asuming that he didn't switch the coils back to the original 90 one because he didn't know about it.

I don't know as of yet how they wired it up for it to work because its about -5 - 0 degrees out , but i will get back to you on this in let you know about the wiring.
Im just as stumped as you are probaly.

 

[Sean485]

Why dont you just use the 90 coil and power transistor? The 90's have the tach filter as a seperate one wire unit on the intake manni bracket, that "might" be what that extra pin is for on the 90 coil pack but I would just use the 90 electronics for a 90 chassi and 91+ electronics for a 91+ chassi for the sake of simplicity.

 

[DJDIGITALDEATH]

What i think i may do to solve the problem is rip out the entire wire harness and switch it with a 91+ car.. then everything will have to work fine..

but i was just hoping for an easier cheater way to splice and tap the wires in with some type of wire schematic..

 

[jimh]

What i think i may do to solve the problem is rip out the entire wire harness and switch it with a 91+ car..

Don't do that because you will probably create more problems than you solve.

but i was just hoping for an easier cheater way to splice and tap the wires in with some type of wire schematic..

Try this
http://prostreetonline.com/pso/pages/howto/showarticle.asp?articleid=19
or
http://www.ecanfix.com/users/mdhamilton/ecuconversion.html