Starts backfiring a few seconds after it has been running

2001 CHEVROLET SILVERADO
329,438 MILES • 4.3L • V6 • 2WD • AUTOMATIC
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MATTSMITH
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  • 1 POST
I changed the spark plugs, the wires, the catalytic converter, the rotor, the battery, the starter, the fuel filter and it's backfiring when I start it.
Mar 4, 2020 at 7:44 AM
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SCGRANTURISMO
  • CERTIFIED EXPERT
  • 4,897 POSTS
Hello,

Can you please double check that the spark plugs wires are installed correctly and a couple of them didn't get routed to the wrong cylinders? In the diagrams down below I have included a diagram of the correct spark plug wire routing for your vehicle. Please use this guide and get back to us with what you find out and we can go from there, if needed.

Thanks,
Alex
2CarPros
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Mar 4, 2020 at 8:04 AM