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Old 07-05-2006, 07:46 PM   #1
t3hWIT
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Question Info requested, wiring a newer coil pack to an older harness

As a few of you might know, I am preparing a 2.2 (MY97) to swap in place of my 1.8 (MY95). It was suggested to use the 1.8 intake manifold including the throttle body, injectors, and the wiring harness to simplify things.

I purchased some new NGK resistor wires from www.sparkplugs.com (NGK redirected me) to the sum of $55 on my front porch.

I removed the 2.2 from the chassis last saturday, and pulled the manifold. I went to my 1.8 and started poking around just for the hell of it, pulled the spark plugs... and saw my $55 going down the pisser. The '95 coil pack is female, with the plug wires being male. The '97 coil pack is the opposite, with the wires as well. The coil packs have a different shape, and their plugs are different.

My question is, can I wire and run the newer coil pack off the older harness and obd1 computer? Both have a three wire plug, but the wires are different colors, and I don't have a wiring diagram to trace.

Standing next to the passenger side tire, looking at the coil pack, reading from left to right (rear of the vehicle to the front) the wires are:

MY95
1. yellow w/ red stripe & green diamonds
2. red w/ yellow stripe
3. yellow w/ white stripe

MY97
1. blue
2. yellow w/ black stripe
3. red w/ green stripe


There may have been slightly different shades of stripes on the MY97 wires, I couldn't tell 100% because they were dirty and the red wire was stripped (don't ask). If I can wire this in, would I just match wire 1 to 1, 2 to 2, and 3 to 3? Did I just waste a day and a half of pay when I could have stuck with the 1.8 wires (assuming the head length is the same)


Edited for crappy vocabulary, and a very lengthy search came up with nothing.
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Last edited by t3hWIT; 07-06-2006 at 08:10 PM. Reason: ICM? try coil pack...
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Old 07-05-2006, 08:46 PM   #2
ballitch
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i know this has been covered before, its gotta be on this site somewhere. if you can just bolt the EJ18 intake manifold onto the EJ22 block, you should be able to keep your stock plugs wires and coil pack (or ignition control module, or whatever the technical name for it is.) arent you also going to need the dual port exhaust exhaust manifold? or was the 95' EJ18 dual port also?



~Josh~
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Old 07-06-2006, 07:42 PM   #3
t3hWIT
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I am going from dual port to single port, with the 2.2 being single. I bought new plug wires made to fit the 2.2 coil pack, which is my main problem. I'm thinking that if I can use the 2.2 coil pack then I wouldn't have wasted the money on the wires.

Last edited by t3hWIT; 07-06-2006 at 08:12 PM. Reason: yep...
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Old 07-07-2006, 01:26 PM   #4
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bump for the urgency
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Old 07-07-2006, 11:33 PM   #5
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i pm'd ya. hope it helps
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Old 07-11-2006, 01:48 PM   #6
t3hWIT
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bump!
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Old 07-11-2006, 06:15 PM   #7
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Why aren't the wires returnable?
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Old 07-11-2006, 08:30 PM   #8
t3hWIT
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Well, the are, but I won't get my $15 shipping back, nor the fee to ship it back to them.

I thought maybe you personally would have some advice here, whether it be a yay or nay (preferably a yay) as to whether it can be done or not. I assume it can because its three wires on each, but I don't know if the signals are different, how the damn thing works, and what wires are for what.
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Old 07-11-2006, 08:57 PM   #9
Patrick Olsen
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I'd be surprised if they weren't wired exactly the same, so you could just splice the new plug in retaining the same order of wiring front-to-rear. If the car doesn't run, well, then you'd be back to having to kinda guess, but I bet it will.

Edit: To expand on this a bit... Inside the coil pack are two primary and two secondary windings. The primary windings are connected to the wiring harness, the secondary windings are what fire through the plug wires.

You have three contacts on the wiring harness on the coil pack, call them A, B, and C. Measure the resistance A to B, B to C, and A to C. I imagine what you'll find is that A to B and B to C are really low - probably less than 1ohm. A to C will be noticeably higher (although still not all that high). A to B and B to C are the primary windings. As I said initially, I'd be willing to bet that the two coil packs you hav are wired the same.

One primary winding goes to the front of the coil pack to transfer energy to the front secondary winding, the other goes to the rear of the coil pack. It should be pretty obvious which is which. Just look at your two coils, match 'em up, and splice the correct plug onto the wiring of the coil pack you need to use.

Pat

Last edited by Patrick Olsen; 07-12-2006 at 12:18 AM.
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Old 07-12-2006, 11:17 AM   #10
Matt Monson
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You can absolutely do the conversion, and it's as simple as Pat makes it sound. I just figured a good used replacement coil pack was going to run you $25-40 and then you have to cut it up and splice in the correct connector. It just seems like a lot of brain damage versus replacing the wires with the correct ones. If it were my car and I were in the situation, I would try and sell the wires locally and just order the correct ones...
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Old 07-12-2006, 08:09 PM   #11
t3hWIT
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Thanks for the info Pat. I wasn't sure considering the pigtail, and what connecting the wrong wires might possibly do. I'll either try this tomorrow or early next week. I'm dropping the engine in this weekend and I don't want to do it then, I'd like to keep the swap as simple as I can get it. I'll let you guys know how it went.

MAtt - I am swapping the 2.2, which came complete out of my wrecked MY97, so the coil pack is handy.
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Old 07-14-2006, 06:34 PM   #12
t3hWIT
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Quote:
Originally Posted by Patrick Olsen
You have three contacts on the wiring harness on the coil pack, call them A, B, and C. Measure the resistance A to B, B to C, and A to C. I imagine what you'll find is that A to B and B to C are really low - probably less than 1ohm. A to C will be noticeably higher (although still not all that high). A to B and B to C are the primary windings. As I said initially, I'd be willing to bet that the two coil packs you hav are wired the same.



Pat
That was exactly how it worked. Matched up, a to a and so on, it fired up no problem. Good thing considering I thought "the hell with this" and pulled on the plug wire for cyl 2 and ripped it out of the socket.
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Old 07-15-2006, 11:44 PM   #13
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Good to hear it worked out.
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