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Old 06-23-2008, 11:29 PM   #1
N3v
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Default COP install issue.

hey guys, I went and picked up some COPs from a 2000 toyota tundra today. Got all 8 for 80 bucks, not too shabby! Anyway, I've run into a problem: I just wired them up loosely to my stock coil pack plugs to see if they'd work, I connected the negative and positive terminals to my COPs, put spark plugs into the COPs, grounded the body of the plugs, and then touched the trigger wire to the positive, and i got spark! Then i jammed the trigger wire into the trigger hole on the stock coil pack plug and tried to crank it. no spark. but i could still touch the trigger to the positive and get a spark. I figured that it might not have gotten spark on the crank due to my shitty wiring job that I was using just to test the rig. But then the 'touch the trigger wire to positive terminal and get spark' trick stopped working. now my positive and negative terminals on my stock coil pack plug are reading ~4 volts across the negative and positive terminals. I checked the fuses, none of them look blown, and I figure I'd get 0 volts before I'd get 4. any idea what the deal is?

Edit: Nevermind, I figured it out. It was my own stupid wiring's fault. Coil packs are working like a cham now though! The difference is amazing; I feel like I can see a difference in the spark with the COPs and the stock ignition system.

So anyway, just so all of you know, 2000 toyota tundra ones work too. They just Barely fit though

Last edited by N3v; 06-24-2008 at 11:45 AM.
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Old 06-24-2008, 11:44 AM   #2
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You fryed your COPs, congrats.
COPs fire for 2.5-5 ms at a time, I don't care how biefly you brushed the trigger straight to 12v, it most likely overheated the coil and fryed it. Go buy 8 more!

BTW-do thundra coils fit in the Miata valve cover, and how far do they go in, like are they flush?
Can you snap a pic cause I remember some people asking this.
I hope you picture taking skillz are better than your wiring skillz, yo!
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Old 06-24-2008, 11:56 AM   #3
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Quote:
Originally Posted by Zabac View Post
You fryed your COPs, congrats.
COPs fire for 2.5-5 ms at a time, I don't care how biefly you brushed the trigger straight to 12v, it most likely overheated the coil and fryed it. Go buy 8 more!

BTW-do thundra coils fit in the Miata valve cover, and how far do they go in, like are they flush?
Can you snap a pic cause I remember some people asking this.
I hope you picture taking skillz are better than your wiring skillz, yo!
8 more? I bought 8 so I would have screw up room. The ones I did that to don't appear broken, as they're in my motor right now and still functioning.

Anyway, with the tundra COPs, the little plastic triangle that comes off of them that you use to anchor them comes off at a 90 degree angle from the wiring plug. No matter how much you turn it it won't fit in between the camshaft humps in the valve cover. However, having 8 of them, I did a little R&D. I sawed off one of the anchor triangles and then dropped it in, and although it's now clearing the cam humps, it comes to rest at the exact same height that the others do. So although it fits flush on the spark plug, the coil pack is slightly taller than a stock spark plug wire and you end up with about 1/3 of an inch between the rubber piece on the COP and the valve cover.

The only way to run the coils is with the anchor in between the camshafts and then the wire plug sticking off of the side. It works though. I'll take pics when I get home from work.

And yes I know I'm a noob with wiring when it comes to ignition systems. My real fault with this job was that I was trying to just do a mock up test with the hardware before I cut the plugs off, and that was my real issue.

I did build my own megasquirt though, and it appears to work. I haven't installed it yet though.

Edit: Also, regarding the tundra COP's, they've got the same wiring setup as the 2003 corolla ones, or it seems most toyota COP's. From left to right, with the plug facing down:
1 - Ground
2 - Trigger
3 - Tach output
4 - V+
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Old 06-24-2008, 12:18 PM   #4
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If there is a 1/3" gap you could be ok if you do not have an extractor hood and don't get water in there, but if you do I'd suggest you mock something up, like a thick rubber washer to make it all flush to avoid getting watter in the holes.

Fill in your profile a bit more detailed and list your car and set-up in your sig, it's pretty much a must have here...yeah I know we are ******** about that, but we like it that way.
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Old 06-24-2008, 12:38 PM   #5
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I just bought some tundra ones, the look exactly the same as the corolla ones. cant wait to get them on!
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