Thread: Fuel trims off

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  1. #1 Fuel trims off 
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    I am having issues with my fuel trims being off. There are no exhaust leaks, the o2 sensor is new, and I can not find a vacuum leak. The MAF is a “newer” Delphi. Probably about a year old. What am I missing? Maybe a bad MAF but the readings seem ok. I tried to tune the trims but they keep going off. They are all over the place. Any suggestions?
    2017 Buick Regal 2.0 Turbo (SOLD 2007 Grand Prix GT. Front and rear PLOGs, 1.8 roller rockers, CAI, HPTuned, 3.4 pulley, TEP transmission, 90# springs, rollmaster single chain, Impala front brakes d/s rotors.) Past (Pontiacs) Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G, 78 Trans am, 92 Trans Am.
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  2. #2 Re: Fuel trims off 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    They are off how?

    Low or high?

    Is fuel pressure good all the time?

    SMGPFC Member #1
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  3. #3 Re: Fuel trims off 
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    They are low and high. It fluctuates.

    I have tested fuel pressure and it is good but I did not test it over a period of time. I am running an AEM high flow pump.
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  4. #4 Re: Fuel trims off 
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    I have an AC Delco Maf on order just in case. I will have to get some recent scans and figure out how to post them here.
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  5. #5 Re: Fuel trims off 
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    I cleaned off the MAF again and the trims seem to level out. I am thinking the METH injection may be messing with it. I adjusted the meth so it doesn't inject at a lower boost. So far it is running better.
    2017 Buick Regal 2.0 Turbo (SOLD 2007 Grand Prix GT. Front and rear PLOGs, 1.8 roller rockers, CAI, HPTuned, 3.4 pulley, TEP transmission, 90# springs, rollmaster single chain, Impala front brakes d/s rotors.) Past (Pontiacs) Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G, 78 Trans am, 92 Trans Am.
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