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.
Oct 24, 2024 at 1:30 AM
No spark on three cylinders driver's side?
2004 CHEVROLET SILVERADO
CHUCK8
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This information is for general instructional purposes only. Vehicle repair can be dangerous.
Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
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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.
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.
Images (Click to enlarge)
Oct 24, 2024 at 10:36 AM
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