No spark on three cylinders driver's side?

Tiny
CHUCK8
  • MEMBER
  • 2004 CHEVROLET SILVERADO
  • 5.3L
  • 4WD
  • AUTOMATIC
  • 126,000 MILES
I changed the coil packs and injectors and did not fix it. Changed computer ECM now it doesn't start at all security light on.
Thursday, October 24th, 2024 AT 1:30 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Yep, it sounds like the coil drivers inside the PCM have gone bad, can I ask if you had the PCM pre-programmed? If not, this will be the problem. The PCM must be programmed to the truck to work correctly, you can get a preprogrammed unit by searching Google or Ebay.

Here is how to replace the PCM correctly. Check out the images (below). Please let us know what happens. You may have a crankshaft sensor that is weak and produces an erratic signal to the PCM FYI.
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Thursday, October 24th, 2024 AT 10:36 AM

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