SPONSORED LINKS

Fuel ratio

Tiny
DANSULLS
  • MEMBER
  • 2007 GMC ACADIA
  • 3.6L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 134,660 MILES
Fuel ratio is at 1 to 1.
Had engine replaced 300 miles ago replaced all o2 sensors mass airflow sensor and replaced bank 2 catalytic converter. It runs poorly. On my scanner it's showing air fuel ratio in the red at 1 to 1 ratio. The problem didn't occur until the engine was replaced. It was a crate engine from the dealer.
SPONSORED LINKS
Thursday, December 3rd, 2020 AT 2:36 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

The fuel ratio goal is 14.7 to 1. The job of the O2 sensor is to maintain that number. If the sensor is not working, that would explain the reading.

https://www.2carpros.com/articles/how-an-oxygen-sensor-works

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Are there any codes set?

I am concerned about whether your scan tool is reading correctly. Can you tell me the voltages of the 2 upstream sensors?

Roy

Images (Click to make bigger)
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, December 7th, 2020 AT 3:40 PM

Please login or register to post a reply.

Related Mass Air Flow Sensor Replace/Remove Content

Mass Air Flow Sensor Replacement
GUIDE
Mass Air Flow Sensor Replacement
After starting the engine post sensor replacement, the sensor instantly calibrates itself so there is no learn time required. This sensor is subject to debris and ...

Sponsored links