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4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

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Old 08-26-2009, 10:24 AM   #1
kln5014
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Default Waste spark system?

Might be a stupid question, but I just want to make sure. Are the modulars a spark waster system, as in two spark plugs fire at the same time, even though the one does not actually ignite? Or does each cop only fire one at a time?
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Old 08-26-2009, 10:27 AM   #2
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the coil on plug version is not, the older twin coil pack with plug wires found on some modulars is.
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Old 08-26-2009, 11:03 AM   #3
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Great, thanks for the fast response!
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Old 08-26-2009, 02:39 PM   #4
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One thing that the COP system does do is fire each plug 3 times at lower rpms. Being a geezer this surprised me first time I saw it (I kept playing with the scope settings trying to eliminate the "ghost" traces. It is apparently, from what I have learned, pretty common with newer cars, to clean up emissions at idle...

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Old 08-26-2009, 02:51 PM   #5
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Quote:
Originally Posted by cliffyk View Post
One thing that the COP system does do is fire each plug 3 times at lower rpms. Being a geezer this surprised me first time I saw it (I kept playing with the scope settings trying to eliminate the "ghost" traces. It is apparently, from what I have learned, pretty common with newer cars, to clean up emissions at idle...

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LOL you got more stuff tested on your car than OEMs do most likely. Good post.
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Old 08-26-2009, 02:51 PM
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