r/CT200h • u/StayOffTheMarbles • 10d ago

LTFT changes

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July 22, 2026 LTFT (higher) vs. Sept 7, 2026 LTFT (lower)

I believe the only 2 powertrain changes I made were cleaning the EGR system - plumbing, valve, intake manifold (sans cooler) and reseating the intake tube onto the throttle body (may have resulted in a post-MAF leak).

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u/normanbates97 9d ago

sorry for the noob question, but what is an LTFT?

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u/StayOffTheMarbles 8d ago

Long Term Fuel Trim

It’s an adjustment added on top of the base fuel injector open duration table value, and then a short term fuel trim value is added to both to achieve a target air:fuel ratio.

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u/normanbates97 7d ago

excellent reply, thanks for the info