Wierd COP Problem - its eating me inside - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-10-2008, 08:44 PM   #21
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i didnt change nothing when i went to cops, just lowered the dwell and enjoyed....
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Old 03-10-2008, 09:02 PM   #22
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My vote is for weak 12v and gnd as well. Pretty sure these exact COPs have been known to shoot a bolt of electricity a few inches to the nearest grounded piece of metal when testing.
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Old 03-11-2008, 10:49 PM   #23
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Anyway, problem solved. I used fatter wires for grounds first and shared them between all four coils, same problem but slightly better results. Car started but still had trouble idling. So what did I do next. I separated the coils into pairs for grounds. I paired them by how they fire. So 1 and 4 was on its own ground and so were 2 and 3. Grounded them both to the valve cover and problems went away. Started easily using my old MSQ file with all my old cranking parameters. Took it for a test drive and it went like a bat out of hell.

Thanks for sticking with me guys.

Last edited by Saml01; 03-11-2008 at 11:31 PM.
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Old 03-12-2008, 04:49 AM   #24
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Ground connections seem to be a very special point for the COPs.
Glad you got it running.

Greets
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Old 03-18-2008, 01:36 PM   #25
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Figured out the problem 100% for sure this time.

If I want the car to idle smooth all the way from cold start I gotta use a 5ms dwell. Anything less and it doesnt work.
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Old 03-19-2008, 10:31 AM   #26
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Anyone wanna explain what dwell is? or how it makes a difference in my case? or even why I have to run a dwell twice what is recommended? Does it affect strength of the spark, or engine performance?
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Old 03-19-2008, 10:34 AM   #27
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its how long the coils charge before the spark is released....maybe the one's you got were weaksauce...people have been putting lots-o-miles on the toyota cops on stock dwell times without issue...so if it works it works.
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Old 03-19-2008, 11:07 AM   #28
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^ I guess I am just that lucky.

What if I just leave it at 5.0? The car has been running really good, and I cant sense anything wrong. My biggest concern is if this dwell thing is going to affect spark strength which is, like, the reason why I did this preventative modification.

What about this?
http://autorepair.about.com/library/a/1h/bl483h.htm

Maybe I should check my timing again.
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Old 03-19-2008, 12:02 PM   #29
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You shouldn't need to adjust dwell from the factory setting right? Since COPSs are reported to work with the stock ECU.
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Old 03-19-2008, 12:08 PM   #30
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^ Yes that is correct.
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Old 03-20-2008, 12:27 PM   #31
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Well now I seem to have catched your COP problem - installed the emu with boomslang harness and cops are not firing... Could it be, that the relatively small but about 1,20meter long wires of the boomslang eat up enough of the trigger voltage to hide the COPs from firing?

Edit - I had tried the COP conversion last year with the emb and boomslang and ended giving up because of the same problem.

Thanks for any suggestions.

Greets
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Old 03-20-2008, 01:03 PM   #32
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Def not the wires for the trigger. With the key on, are you getting 12 volts at the coils?

Can you calibrate dwell with the EMU?
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Old 03-20-2008, 04:10 PM   #33
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O.K. it got nothing to do with the COPs - I tried with EMU and original ignition system -didn't run. Tried without the EMU - runs. So it's in the wiring of my changed emb boomslang.

I will check the wiring and then will bridge the cut wires to make sure the harness is fine. Then we wil go further.

Greets
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Old 03-22-2008, 03:26 PM   #34
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Just a little update - had a check of the rebuild boomslang today - everything was fine.
Tried just with base settings of the EMU -nothing.

Then I bridged all the cut wires at the EMU end of the boomslang - car started.

Plugged into the EMU again - runs. Suppose it was a loose connector pin at the new C connector on my EMU boomslang.
Car also runs with the COPs and EMU but starts really bad - takes a long time to crank and if I end cranking - the car starts. Runs fine with rock steady idle. Any suggestions? (maybe I should start a thread because I'm afraid the question will drown here)

Greets
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Old 03-22-2008, 08:14 PM   #35
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I think you should, and explain the situation clearer.
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Old 03-23-2008, 02:57 AM   #36
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Quote:
Originally Posted by Saml01 View Post
I think you should, and explain the situation clearer.
Well - I did and hopefully made the situation clearer - but sometimes that isn't quite easy if you have to do in a foreign language. (Although I tend to think in english in the last time if it comes to turbo and emanage things... ) But there are times where I don't find the right words to describe a certain situation.

The thread is in the "Emanaged" section - hopefully someone can give me a hint.

Greets
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