I have a 1996 p -30 chases with a 454 J code engine. It will start up and run fine (engine cold). After the engine warms up engine will crank but makes no attempt to fire. I drove rv from storage to the house (about 20 miles) backed into the drive. Tried to start rv later and it just turned over never firing. I let it sit over night and it started right up. I turned the engine off and restarted a couple of times sitting in the drive Idling again engine cold. I warmed up engine. I was showing engine temp. and shut engine off. Tried to restart and all it does is crank,never attempting to fire. Is it a coil issue? Also Is this coil external ?

Doesn't sound like a bad coil but more like a vapor lock with the fuel pump. Pull the coil wire at the coil and loosen the fuel line. Turn the engine over to see if any fuel comes out of the line. This way you can rule out fuel problem and consider ignition as the problem.

fivejackie wrote:Doesn't sound like a bad coil but more like a vapor lock with the fuel pump. Pull the coil wire at the coil and loosen the fuel line. Turn the engine over to see if any fuel comes out of the line. This way you can rule out fuel problem and consider ignition as the problem. X-2, very good advice for a starting point to eliminate your problems. Good Luck, I love Chevy engines I have the newer now obsolete 496 in my coach.

After you do what Jackie said (check for fuel) see if you have spark coming out or the coil wire, if so re insert coil wire then check for spark at the spark plug. Do this after engine shuts off and will not start then you will know if your have a ignition or fuel problem. Let us know what you find and you will get more detailed help.

thanks guys will check these few items.

That yr 454 should have the coil in the dist cap. Me personally would buy a new cap and rotor.The coil comes with cap. When you change cap your firing order is 18436572 one is drivers side front and goes clockwise around dist. If it still gets warm and won't crank take the cap and rotor off and a curved black part with 2 wires and 2 screws may be getting hot and quit firing. Replace this peice but do put dialectic grease on the bottom of the part before installing. This insulates the part from the heat hope this helps

chevy gear heads | Good Sam Community

Gjac
Explorer III
Feb 06, 2016
After you do what Jackie said (check for fuel) see if you have spark coming out or the coil wire, if so re insert coil wire then check for spark at the spark plug. Do this after engine shuts off and will not start then you will know if your have a ignition or fuel problem. Let us know what you find and you will get more detailed help.
J-Rooster
Explorer
Feb 06, 2016
fivejackie wrote:
Doesn't sound like a bad coil but more like a vapor lock with the fuel pump. Pull the coil wire at the coil and loosen the fuel line. Turn the engine over to see if any fuel comes out of the line. This way you can rule out fuel problem and consider ignition as the problem.
X-2, very good advice for a starting point to eliminate your problems. Good Luck, I love Chevy engines I have the newer now obsolete 496 in my coach.
fivejackie
Explorer
Feb 06, 2016
Doesn't sound like a bad coil but more like a vapor lock with the fuel pump. Pull the coil wire at the coil and loosen the fuel line. Turn the engine over to see if any fuel comes out of the line. This way you can rule out fuel problem and consider ignition as the problem.

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