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I have a 2007 Honda Pilot 4wd with 165,000 miles. I checked the fuel trims on the car. The short term trims on both banks are around 10%. The long term trims are both around 0%. This is after running a fuel system treatment that brought the long term trim down from 5%. Is there any way to lower the short term trim with continued fuel treatment? The tank of treated gas is done.
10% seems fairly reasonable but if you want to try to massage it down a bit more, you try a second tank with a high-performance, detergent-based fuel additive, such as Berryman B-60 High Mileage Fuel System Rejuvenator (part #7516), and then check the air-side components like air filter, MAF sensor, and throttle body. Any one of those can adversely affect the trim.