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No spark

B

Billy Oldham

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Well my guys blew a transmission and we put a new one in. They texted it by going up hill loaded in low. The tranny did fine the motor blew. Now I brand-new and no spark. Removed fender to check computer and nothing so for the last five years the truck with a brand new motor and tranny have done nothing but sit and race dust storms. Any idea how to bring spark back in this trucks life. 1996 Chevy 4x4 dually king cab.
 
Welcome to the forum @Billy Oldham

it sounds like a wire on the harness might not have gotten connected after the engine was replaced. what engine do you have? we will need to start out by checking for power and ground at the ignition coil, also there should be a crank sensor up behind the front crank pulley. was a new sensor used new or the old one re-used. was it connected or are the wires to it possibly frayed by oil soaked insulation pealing off?

do you have a scanner that can read live data like seeing RPM signal when cranking? this can also tell us more info.
 
Well, your posting a gas engine issue in a diesel portion of the forum. So guys more apt to deal with gas engines might never see it.

But let’s give a shot at what you’re trying to say.

96 chevy 4 door with a gas engine, I am gonna take a wild guess and say it’s 7.4 liter?
You said “Now I brand-new and no spark.” Implying you have just finished putting in a new long block, crank the engine and it won’t start. So you verified fuel is proper, and have no spark at the spark plug. Did you verify the computer has power? Do you have a scanner hooked up and reading anything or just had billy hold on the the spark plug wire with one hand and the engine with the other?

Then it sat unfinished for 5 years and now you are going to try again to get it running…

Am I getting this right? If so the 96 still had a distributor so check power to that. Once it is good and the three (iirc) wires from it are connected- you might check the coil itself.

Understanding what exactly happened to the engine to get replaced can help.
“It blowed up” means an m1a1 abrams tank or a naval destroyer put hot steel into it and only a hub cap is left. Maybe the top of the engine caught fire and not having replaced the melted harness is an issue. We really have very little info to go on.
 
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