Fuel Trim Question
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Instructor
Joined: Oct 2019
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From: NJ
Fuel Trim Question
IS250 AWD 2007 111500 miles
I purchased an ODB2 scanner to get rid of a couple codes due to not screwing on my fuel cap. I noticed that my LT Fuel Trim in bank one is around -5% and in bank 2 around -7% when at idle after a trip. The highest I have seen bank 2's LT Fuel Trim is -2.8% during acceleration. Does that indicate some sort of small blockage - I was thinking maybe the airfilter but bank one gets as high a -0.08%. Neither of them ever measures a positive value.
I purchased an ODB2 scanner to get rid of a couple codes due to not screwing on my fuel cap. I noticed that my LT Fuel Trim in bank one is around -5% and in bank 2 around -7% when at idle after a trip. The highest I have seen bank 2's LT Fuel Trim is -2.8% during acceleration. Does that indicate some sort of small blockage - I was thinking maybe the airfilter but bank one gets as high a -0.08%. Neither of them ever measures a positive value.
Last edited by CFAI; Apr 12, 2022 at 07:49 AM. Reason: minus sign
IS250 AWD 2007 111500 miles
I purchased an ODB2 scanner to get rid of a couple codes due to not screwing on my fuel cap. I noticed that my LT Fuel Trim in bank one is around -5% and in bank 2 around -7% when at idle after a trip. The highest I have seen bank 2's LT Fuel Trim is -2.8% during acceleration. Does that indicate some sort of small blockage - I was thinking maybe the airfilter but bank one gets as high a -0.08%. Neither of them ever measures a positive value.
I purchased an ODB2 scanner to get rid of a couple codes due to not screwing on my fuel cap. I noticed that my LT Fuel Trim in bank one is around -5% and in bank 2 around -7% when at idle after a trip. The highest I have seen bank 2's LT Fuel Trim is -2.8% during acceleration. Does that indicate some sort of small blockage - I was thinking maybe the airfilter but bank one gets as high a -0.08%. Neither of them ever measures a positive value.
The closer to 0 is ideal.
Thread Starter
Instructor
Joined: Oct 2019
Posts: 861
Likes: 366
From: NJ
Ok thanks. I really know next to nothing about cars/powertrains. I thought maybe bc the LTFT didn't move past 0 into the positive that perhaps the indicated some external issue that was biasing the fuel delivery to be slightly rich. While driving the the STFT are usually less than 10% in magnitude, but very occasionally I saw them bumping up as high as |15%| while I was driving.
Ok thanks. I really know next to nothing about cars/powertrains. I thought maybe bc the LTFT didn't move past 0 into the positive that perhaps the indicated some external issue that was biasing the fuel delivery to be slightly rich. While driving the the STFT are usually less than 10% in magnitude, but very occasionally I saw them bumping up as high as |15%| while I was driving.
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