|
I've logged fuel trims (long term and short term) while cruising (part-throttle). I don't know how to upload the data logs but they show this:
The extremes reached on STFTs on both banks range from about -7 to +7. They are not pegged.
The LTFTs are usually about 8 apart. The bank 2 LTFTs range from about -6 to +2 while the bank 1 LTFTs range from about 0 to +8
I have an extremely basic understanding of fuel trims but what confuses me is that I would expect the bank 1 LTFTs to be in the negative and the bank 2 LTFTs in the positive because the bank 1 AFR is richer than the bank 2 AFR. However, the opposite is true. The bank 1 LTFTs are consistently in the positive and the bank 2 trims are, for the most part, in the negative.
Can anyone make any sense of this?
Apologies if this makes no sense and if someone can explain how one uploads a zdl data log, I'll try and do that
|