Coil Breaking Down?

[Ghoste]

Can a coil break down gradually or are they more like an "on or off" type of device?  What symptoms would you expect from a failing coil?

[birdsandbees]

Starts cold, but not hot is a first sign of trouble. Coils can be intermittent or cause hard starting when hot and when humid / wet.

[Ghoste]

How about the engine running fine cold and quitting sudden at idle once warmed up but starting fairly easily?

[nascarxx29]

Any backfire from weak spark occuring

[Ghoste]

No backfire.  Just a sudden engine quitting at lower rpm when under load (floats are set correctly and fuel pressure is fine, ecu has been replaced twice)

[nascarxx29]

What are you using for a ecu the orange box.charging system working right

[nascarxx29]

http://www.forabodiesonly.com/mopar/showthread.php?t=204335

[Ghoste]

Charging system works excellently and the ecu has been changed out a few times without a change in the symptoms.

[nascarxx29]

Just a guess vacuum leak.if you cover carb throat with your hand or big rag does it die quickly.if so diaphm in vac advance intake manifold  carb base power brake booster etc vac source

[nascarxx29]

Does electronic pick up test ok and is air gap at reluctor set to spec at night open up hood and look and listen for arcing maybe coil or wires

[Ghoste]

Replaced the coil with a different one tonight and took it for a long drive and all the symptoms are gone.  Looks like my suspicion was right but thanks for your help all the same Dave.

[nascarxx29]

Part time coil odd  glad you got itsolved

[Bronzedodge]

I had the exact same condition in my Demon once.  Factory coil.  Swapping it out fixed it.