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I have power to my 8 coil packs but no spark out of all 8 plugs????

Hot Blonde
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Hot Blonde New Member

Hot Blonde

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     I have a 2000 Chevy Silverado 1500 4x4 5.3LT,  I swapped out my 4l60e tranny for a used good running one, I struggled but got er in. I started her up and she was a little rough at first but ran fine, I put 4qts of ATF in and she read over full hot and cold check. So I pulled tranny to seat my torque converter, I didn’t pre fill it either. Anyway after that I couldn’t start her. So a new neutral safety switch I put in and new plugs to it. She would turn over but not start at this point. No spark it sounded like. So I checked the spark plugs and all 8 coil packs power to packs but not to plugs and no spark in any of them. So I proceeded to check all the fuses, relay’s & sensors that had anything to do with the ignition/ starter system. Everything was working. So I checked the PCM plugs, battery cables and all wiring to coil plugs. All the ground wires under the hood. I reset the security program in case it locked up something in the ignition system. I was told maybe check the Crank or Cam Shaft Position Sensor? I am at my wits end and still can’t get her to do anything but turn over, she started before?  What am I missing? All 8 coil packs are not getting power to plugs and all 8 plugs are not sparking it’s gotta be something simple? Please help no one on this end can figure it out… thank you ahead of time!!

Edited by Hot Blonde
citydriver Enthusiast

citydriver

Posted
Posted

Check for the wiIring harness that runs over the transmission bell housing to the back of the right (passenger) cylinder head. Make sure it didn't get pinched between the trans and the engine block. Also make sure the ground on the back of the head is secure/tight.

 

richard wysong Senior Enthusiast

richard wysong

Posted
Posted

The coils are triggered by a ground pulse from the PCM not power. The crankshaft sensor is on the rear of the engine above the flywheel so I bet it may have become unplugged or the wires pinched when you pulled the trans

Liz Kozel-Gill Enthusiast

Liz Kozel-Gill

Posted
Posted

I will check to see if it came unplugged and will check to see if any wires got pinched and will check the grounds again as well. I will let you know..

 

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