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1997 Chevy 5.7 vortec

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5 years 1 month ago #27440 by Nick67410
1997 Chevy 5.7 vortec was created by Nick67410
1997 Chevy k2500 5.7vortech
No codes
Running real rich on bank1

Trying to figure out what all is involved in system b in the picture attached. Seems like it is always in open loop.
Should it be?

Also very detailed and to the point videos.
Thank you
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5 years 1 month ago #27444 by cheryl hartkorn
Replied by cheryl hartkorn on topic 1997 Chevy 5.7 vortec
any o2 sensor readings? could have a stuck rich one on bank 1

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5 years 1 month ago #27521 by Rockyroad
Replied by Rockyroad on topic 1997 Chevy 5.7 vortec
Is this at idle? Maf reading looks high. I don’t help people who use metric units.
Just kidding...about 180°f for those without an conversion table
Someday I'll figure this out

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5 years 1 month ago - 5 years 1 month ago #27556 by guafa
Replied by guafa on topic 1997 Chevy 5.7 vortec
Both, bank 1 and 2 are running rich (at least for PCM). PCM is subtracting fuel in bank 1 faster than in bank 2 (acumulated percentage in bank 1 is bigger).

7.6 g/s is normal according to past readings i have made in one of those engines. At 80 degrees system should be in closed loop.

Please post O2 readings for better undestanding.
Last edit: 5 years 1 month ago by guafa.

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