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Air fuel ratio issues

Discussion in '1st Gen Tundras (2000-2006)' started by Bmktw2, Sep 15, 2023.

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Sep 15, 2023 at 9:15 AM

#1

#1
Bmktw2 [OP] Yard Dog

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May 16, 2023

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#97109

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470

Gender:

Male

First Name:

Nic

Vehicle:

AC 2001 5spd 4x4 V6

Been having issues with something on the V6. I'm driving on the interstate, accelerating in the on-ramp the engine went lean 18:1 but once 70mph was reached and the cruise -control enabled, the ratio settled at 14.7:1
About an hour in the drive, the AFR suddenly dropped down to 9.7:1 with no change in driving. I know the narrow band O2 sensors aren't very accurate and my ever worsening exhaust leak between the cat's can't help. I imagine the computer is running on an open loop by now. Anyone else experience this ?

Last edited: Sep 15, 2023

Bmktw2, Sep 15, 2023

#1

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