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5.3 fireing order

joshc64311

By joshc64311
in Engines & Drivetrain

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'17 Sierra Enthusiast

'17 Sierra

Posted
Posted

Any one know what the fire order is on the 5.3?

1-8-7-2-6-5-4-3

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'17 Sierra Enthusiast

'17 Sierra

Posted
Posted

Is # 5 AMF cylinder? I have a miss.

Are you throwing a code and that's how you know it's 5? I'm not sure if 5 is or not...50/50 chance I suppose!

joshc64311 Enthusiast

joshc64311

Posted
  • Author
Posted

Are you throwing a code and that's how you know it's 5? I'm not sure if 5 is or not...50/50 chance I suppose!

Yep the cel will flash and shut off.

'17 Sierra Enthusiast

'17 Sierra

Posted
Posted

Is # 5 AMF cylinder? I have a miss.

I looked it up and if it's correct,1,4,6, and 7 are deactivated for AFM.

  • Like 1
'17 Sierra Enthusiast

'17 Sierra

Posted
Posted

Yep the cel will flash and shut off.

See if you can get a code reader to use. Even though the CEL goes out, a code reader will tell you if and what cyl misfired.

joshc64311 Enthusiast

joshc64311

Posted
  • Author
Posted

I looked it up and if it's correct,1,4,6, and 7 are deactivated for AFM.

Thats what i keep coming up with, i thought AMF was the middle 4 cylinders. Im so confused lol

  • 5 years later...
CamGTP Senior Enthusiast

CamGTP

Posted
Posted

Cylinder 6 in the 3rd cylinder back on the passenger side.

 

Fuel pressure on the low side will be 30-60 psi give or take, it's an on demand fuel system with a computer controlling the fuel pressure. The high side fuel pressure can be 800-2000+ psi for the higher pressure fuel system.

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