Alcohol percent and fuel trim high running rich codes
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Alcohol percent and fuel trim high running rich codes
I have a 07 Chevy suburban 5.3 vortec flex fuel but the flex fuel has been disabled.
I’ve been having codes come on for running rich.
The alcohol percent keeps climbing up at 65% right now been running 93 octane for a year due to pinging issues under acceleration on 87.
long term fuel trim goes to about -30.5%
short term fuel trim usually stays +/- 5% from 0 at idle.
Tried mass air flow, intake gaskets, checked all vacuum lines, still nothing has fixed it.
I’ve been having codes come on for running rich.
The alcohol percent keeps climbing up at 65% right now been running 93 octane for a year due to pinging issues under acceleration on 87.
long term fuel trim goes to about -30.5%
short term fuel trim usually stays +/- 5% from 0 at idle.
Tried mass air flow, intake gaskets, checked all vacuum lines, still nothing has fixed it.
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Kamelred408
Tahoe & Suburban
7
Jan 15, 2020 4:02 PM
