Melting ignition coil

BOJACK1968

MEMBER
2002 MITSUBISHI ECLIPSE
2.4L
139,000 MILES

I have the car listed above (Spyder). Ignition coil on cylinder 2 keeps melting, on that cylinder only. I have install three different ignition coils on it, all three have melt it. I did change the plug that plugs up to the ignition coil with a new plug, it still does the same thing. The car still runs with the other coil on cylinder 4, but misfire. Can you please help me? I have no idea of what’s going on with it. Thank you.

Thursday, July 9th, 2020 AT 3:08 PM

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

So have you changed both plugs and wires for this coil? You said you changed the plug that goes with it but you have two coils, one for two of the four cylinders. Then another coil for the other two.

More then likely you have a short somewhere causing the coil to operate inappropriately which causes it to overheat and melt. This is either a plug, wire, or an open circuit on the ECM control wire causing the coil to overheat.

We need to monitor the control wire with a lab scope to see if there PCM is pulsing the coil when the plug is supposed to fire. A meter will not be fast enough to see the voltage drop. If there is just constant voltage then we have a short and most likely have damaged the PCM. I suspect we are going to have to replace the part that is causing the short and then the PCM as well.

Let's start here and see what we turn up. Thanks

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