5.3 MAF reading question...
Thread Starter
Joined: Apr 2006
Posts: 5,604
Likes: 1,149
From: Pittsburgh
5.3 MAF reading question... I'm having a P0300 random misfire code and now non start issue on my 09 Silverado. The plugs are oily on bank 1. The MAF readins is 2.71 according to my scan tool. Is my MAF good or bad?
Launching!
Joined: May 2023
Posts: 286
Likes: 94
From: AZ
I would first replace all the plugs with factory AC delco plugs. And test the ignition coils. The plugs get oily and ruined because of the AFM system. Possible issues:
- Faulty spark plug (s)
- Faulty ignition coil (s)
- Clogged or faulty fuel injector (s)
- Intake air leak
Thread Starter
Joined: Apr 2006
Posts: 5,604
Likes: 1,149
From: Pittsburgh
Well, I borrowed a Snap On scanner. Found a MAP sensor code. When That didn't fix it I busted out a spark plug light and found all the coils are bank 1 aren't firing and all the coils on bank two are firing. I'm assuming that I have a ground issue somewhere.
