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#27
04-16-2012, 01:27 AM
Hummer Veteran
Join Date: Nov 2011
Posts: 163
Re: Gas milage help!!!
Quote:
Originally Posted by HUMTECH
If you have no cats and your setting o2 sensor codes it will run in base fuel all the time, open loop operation. Thats whats killing your mileage.
The o2's upstream *before* the cats effect fuel trim. The o2's *after* the cats have no effect on fuel trim and are only there to make sure the cats are working for emmissions.
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