Coil pack smokes (WHY?)? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 07-31-2008
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Coil pack smokes (WHY?)?

Wanted advice and knowledge! I was wondering if a bad alternator would make a coil pack blow?? OR if my truck was out of time would that make the coil pack blow??? IF not what would make a coil pack blow,I have 93 ford ranger v6 4.0 4x4 ! I have no way of pulling codes from it cause of course it is not driveable when the coil pack blows every time i put a new one on HELP WOULD be much APpreciATED!!!!!
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Old 07-31-2008
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A coil driver (or drivers) in your ICM (Ignition Control Module) are shorted putting a constant DC across the primary of the coils.
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Old 07-31-2008
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Check the voltage off you alternator, if the regulator is bad you could be getting 2 high of a voltage.
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Old 07-31-2008
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Quote:
Originally Posted by My91Ranger View Post
Check the voltage off you alternator, if the regulator is bad you could be getting 2 high of a voltage.
DUH.....It's not the alternator voltage, because his engine isn't running.....
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Old 07-31-2008
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Originally Posted by Takeda View Post
DUH.....It's not the alternator voltage, because his engine isn't running.....
i have tried putting my ignition module on another truck that is exactly the same and the other truck fired up and did not blow the coil pack.But i have not tried putting the other trucks icm on mine and tried it cause coil packs are not cheap! Think that will work?? So you think for sure it is not out of time????
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Old 07-31-2008
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If your ICM works ok on another vehicle, then I don't think the ICM is the problem. The ICM gets signals from the crankshaft position sensor, and PCM. Since the coil drivers in your ICM aren't shorted, something is causing them to be on all the time.

One other possibility is a wiring problem. With the ICM unplugged, measure the resistance to GROUND on the yel/blk, yel/red, and yel/wht wires at the coilpack plug (unplug the coilpack plug first).

Last edited by Takeda; 07-31-2008 at 02:17 PM.
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