Paired Cylinders Not Firing? Coincidence? - Mustang Evolution

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Old 06-21-2015, 12:22 AM   #1
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Paired Cylinders Not Firing? Coincidence?

So I have an 03 crown vic engine in my car using the stock coils right now. Cylinders 1 and 6 are misfiring. I believe these cylinders are "paired" so they are supposed to fire at the same time.. Neither of them are firing. Is it possible for these coils to interfere with eachother or ground eachother out if one goes bad? Also, are these coils being fired from the same place? They are completely dead even at idle and everywhere else. No other cylinders are having problems and the plugs looked fine. What do you guys think, coincidence or no?
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Old 06-21-2015, 12:39 AM   #2
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Are you sure they are separate coils? It the both fire together they are often the same coil and one cylinder is on the exhaust stroke. It allows half the number of coils for the engine. My '97 Aerostar 4.0 was that way.
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Old 06-21-2015, 01:41 PM   #3
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Are you sure they are separate coils? It the both fire together they are often the same coil and one cylinder is on the exhaust stroke. It allows half the number of coils for the engine. My '97 Aerostar 4.0 was that way.
You are describing the EDIS wasted spark ignition system. I have the Coil On Plug which I think is based off of that EDIS 8 system. with my COP ignition, there are 8 coils sitting directly above each of their respective cylinders connected to the boot. That is why I was wondering how this part of it works. I believe the EDIS wasted spark Coil packs are fired by only 4 pins that come from the PCM. Each pin fires 2 cylinders that are paired. So if one of those stops operating for whatever reason, neither of the coils for those two paired cylinders would fire. I know less about this COP system than I do the EDIS 8 coil pack system.

This seems like some **** Scotty would know about better than I would. Save me scotty

Im putting my car back to stock so I can sell it and get a mint condition mach 1 or a s197
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Old 06-21-2015, 04:10 PM   #4
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The wasted spark system went away with the introduction of COPS, pretty sure the last year was 1998 the 1999 and later ECU fires each COP individually.

However all cops have a common source, the ecu provides a ground to each COP individually.
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Old 06-21-2015, 04:27 PM   #5
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The wasted spark system went away with the introduction of COPS, pretty sure the last year was 1998 the 1999 and later ECU fires each COP individually.

However all cops have a common source, the ecu provides a ground to each COP individually.
Thank you. Are these grounds both actuated from a common point, or seperately? I am currently 3 hours away from my car so I can't just go test this stuff with the multimeter
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Old 06-21-2015, 07:48 PM   #6
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No the source 12V is the only common feed all COPS have their own wire to ground via the ecu.
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