2006 Chevrolet Silverado Misfire in Cylinder 7 - Diagnosis and Solutions
I've replaced the coil, spark plug, and ignition wire for cylinder 7 on my 2006 Chevrolet Silverado, but the misfire persists. The old coil tested fine when installed on another cylinder, so it's not faulty. I haven't touched the wiring harness or fuel system yet. Given that the issue remains after replacing key components, I'm wondering if there could be a problem with the injector, ignition timing, or fuel pressure. Any suggestions for next steps would be greatly appreciated.
Check the condition of the #7 spark plug—look for wetness, dryness, black soot, or tan color. Use a noid light to verify if cylinder 7 is receiving proper ignition signal. Test the #7 fuel injector for proper operation; a stuck-open injector can cause misfires. Perform a fuel pressure leak-down test to rule out a faulty injector. Finally, conduct a compression test to ensure engine integrity in that cylinder. Only AC Delco spark plugs are used in this vehicle.