How does intake manifold affect fuel trims
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Why was the intake manifold replaced?
The PCM builds up adjustments to engine conditions over time so if the intake is malfunctioning in some way this can affect airflow through the motor which then affects fuel trims.
The new intake fixes whatever was wrong with the old one so now the computer begins to reverse the adjustments that were built-up.
The PCM builds up adjustments to engine conditions over time so if the intake is malfunctioning in some way this can affect airflow through the motor which then affects fuel trims.
The new intake fixes whatever was wrong with the old one so now the computer begins to reverse the adjustments that were built-up.
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Junior User
Joined: Mar 2019
Posts: 97
Likes: 0
Honestly, the only reason it was replaced was because I had it apart to repair a coolant leak. The older intake manifold has a smaller bottom and is all plastic. The newer one has threaded inserts for fuel rail and throttle body. I just don't understand how a larger manifold would create negative long term fuel trim
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