Resolved 420A Melting coil packs

[jd420a1995]

i have a 95 gs and im melting coil packs left and rigth do anyone know why?

 

[luv2rallye]

Look at coil in dark while running. If you see electricity jumping around it, you have bad spark plug cables (internal break) or torn/wet boots at spark plug cable ends or bad coil (typically cracked).

 

[darkiller_666]

Try checking your power transistor if it is out of specs it can cause very quick coil pack melt down, or explosion in my case. I think you take a multimeter and check the ohms from terminals 3-7. There should be no continuity, if there is, like mine was, itll cause the driver side coil to overheat or blow. But check a Haynes manual under Power Transistor Check and Replacement to get the exact details i dont have mine near me or id be a lil more specific.

 

[luv2rallye]

Try checking your power transistor if it is out of specs it can cause very quick coil pack melt down, or explosion in my case. I think you take a multimeter and check the ohms from terminals 3-7. There should be no continuity, if there is, like mine was, itll cause the driver side coil to overheat or blow. But check a Haynes manual under Power Transistor Check and Replacement to get the exact details i dont have mine near me or id be a lil more specific.

This might be helpful if 2g NT's had power transistors but they drive the coils from the PCM.

 

[darkiller_666]

Like a dope i didnt pay attention if he was turbo or not, sorry for the useless info... good luck

 

[luv2rallye]

That's ok you had the terminals incorrect anyway for turbo.

If the engine runs on all 4 cylinders (has spark) see my post 2. If only gets spark on 2 cylinders or none, turn engine off, disconnect the coil connector and see if the PCM has it's output transistors shorted. Do this by measuring resistance from the harness side black/blue wire to ground and then the brown to ground. Both should have no continuity (infinite resistance). If either has low resistance either the PCM must be repaired/replaced OR one of the wires from there to the PCM (they go to pins 3 & 11) is shorted to ground. Unplug the PCM and repeat test to see which.
PCM pinout: http://www.dsmtuners.com/forums/420a-bolt-tech/283950-2gnt-pcm-connector-views.html