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Misfiring on cylinders one, three, five and seven

Tiny
WYOPOKES
  • MEMBER
  • 2004 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 21,000 MILES
My truck recently had a misfires on 1 and 7 cylinders. I tried to clean the injectors with a fuel injection machine, but that did not work, so I replaced the two injectors and the plugs for those two cylinders. It worked for about 30 minutes and started to run really bad. It turned the engine light back on so I scanned it and it said that I had random misfires on 1, 3, 5, and 7 cylinders. I really do not know what else to do. The converter seems to be alright. The mass airflow sensor was changed out and that did not help, and there are no head gasket leaks.
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Tuesday, February 12th, 2008 AT 2:29 PM

2 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Hello,

It sounds like you have a shorted injector on 3 or 5, can you please use this guide to confirm? Also please check the injector fuse Inj2 in the under hood fuse panel.

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

and

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Here are the engine wiring diagrams so you can see how the system works:

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

Cheers
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Wednesday, May 5th, 2021 AT 1:44 PM
Tiny
ROSIE0288
  • MEMBER
  • 4 POSTS
Thanks for this post! I found my injector shorted which popped the inj2 fuse. I got a new one for $78.00 and put it back together all fixed! I love this site.
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Wednesday, May 5th, 2021 AT 1:44 PM

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