Repair guides and support for the eighth generation of Ford F-Series trucks: the F-150, F-250, F-350, and F-Super Duty.

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Why is my coil getting hot and melting

I keep blowing my coil ive replaced the plugs wires icm solenoid and alternator im not sure what else it could be

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Elizabeth Apodaca what exactly do you mean by "blowing my coil"? what happens? What exact model is your Ford and what engine, transmission etc. does it have?

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It gets so hot it melts the plastic cap and its a 460 4 speed its the xlt lariat 4x4

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Also how many coils have you blown and is it an immediate thing or does it take time to happen . What does the truck run like between coil failures .Im not sure what you mean by icm solenoid ?

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I got it in tje end of February and ive gone thew 12 coils and it usualy about 1 week each coil last unless im driving for long.periods at time i cango threw 2 in one day and it drives good but when the coil starts going out it starts bogging down and running like crap and by icm i mean ignition control module

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The truck was sitting for 13 years cuz the guy coildnt future out y it wouldn't start

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Ok that make sense Ive seen this in older LTDs This truck is older than a 1987. more like 1979 . Check the EGR valve for leaks look at the base gasket . It probably is blowing exhaust gas directly from the cylinder head onto the coil and melting it . Just a secondary note . When replacing the gasket make sure you dont knock any of the carbon built up around round the base of the EGR into the manifold as it can end up in a cylinder and the engine will knock as if you put a rod out of it . If it does happen spray carbon cleaner into the cylinders to dissolve the carbon .Hope this helps

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Its a 87 definatly not a 79

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Then your running the wrong coil the coil in 87 should be mounted on the top of the distributor. Is this the original motor?

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Yes it is but its is supposed to be electronic fuel injected but is concerted back to carburetor

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Is the truck a F250?

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If so the coil for this truck should look like this http://www.rockauto.com/info/903/5C1116_...

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Most likely do to the wire harness connected to the coil. Over time those wire get soft due to oil leaking around them. A short to ground would cause the coil to melt and since you already replaced it...the problem must lie in the wiring....also in that truck the wire from the coil should go to the icm which is not much wire to search for a short. Hope this helps

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Yes i have checkec th wiring to icm is good..how ever my alternator harness has the wire harness cut and it was pit back together but somewires r not coneceted still i was wondering if the alternator could be over charging the system due to some of the wires not connected

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Elizabeth Apodaca will be eternally grateful.
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