Ford Mustang Forums : Mustang Forum - View Single Post - Please help no power after pi intake swap!!
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post #7 of Old 04-19-2019, 07:07 PM Thread Starter
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Originally Posted by wmburns View Post
Just wondering. Have you compared the long term fuel trims (LTFT) at idle and under load?

Often when there's a vacuum leak the LTFT's will add fuel at idle when the intake vacuum is high. Under load the amount of fuel being added will decrease as vacuum decreases.

Is there an imbalance between LTFT's on bank 1 vs bank 2?

How about the front O2 sensors? Are they switching at about the same rate?

It also seems to me that it should be expected to give up some part throttle performance with an intake that is much larger than stock. The airflow can get "lazy" and disorganized at low flow levels. The main reason for this upgrade is to improve high end HP.
I will run that test using the scanner and post results. But it's definitely not a lazy type thing. It's as if I unplugged multiple spark plugs... Definite miss.

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