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Old 04-06-2013
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Icon7 Only 2 plugs firing

of the 8 outlets coming from both coils only 2 plugs are firing.
I rotated the coils and the problem stayed the same. The same 2 outlets were the only ones firing after the rotation.
I deduct that it is not my coils. What fires these coils........seems to come straight from the ECU..............is it definitely the ECU?
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Old 04-07-2013
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Explain this rotation you did. You physically swap the coil positions and had the spark plugs wires in the same location. Drivers side or passenger side plugs? Which plugs?


What year and engine? I take it you have a 2.3 or 2.5 dual spark 4 cyl.
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Old 04-07-2013
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10/1994 2.3l.....8 plugs
the only cylinders that are getting any spark are the 2nd and 4th on the passenger side...i removed the plug wire from the coil while the truck is running to check this.
I physically removed both coils and rotated them.....same 2 cylinders are still the only ones firing.

Thanks
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Old 04-07-2013
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I'm trying to wrap my head around this so let me make sure I get this right:

Before the swap:
No ports on the front coil pack was firing (drivers side).
Only 2 and 4 on the rear coil (passenger side).

When you swap coil packs exact same condition:
No ports on the front coil pack was firing (drivers side).
Only 2 and 4 on the rear coil (passenger side)


BTW your way of testing (pull wire and listen for difference in engine speed idle) doesn't work on the drivers side front coil because they only fire on the exhaust stroke for emissions.

Your main concern should be only the passenger side at this time because they are the combustion stroke spark plugs.

I would grab another spark plug and disconnect each plug wire and check for spark that way.
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Old 04-07-2013
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I'll do that tomorrow and will let you know.......
and yes....your description is accurate
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Old 04-08-2013
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Oh course have the spark plug touch the engine block/frame/intake when you do this to complete the circuit.
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