Fuel Trims and LT header install
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Joined: Jan 2024
Posts: 87
Likes: 28
From: New Hampshire
Fuel Trims and LT header install
2010 base model with 24k miles and 6 speed manual.
Current mods are Kooks 1-7/8” headers and their Green Catted X-Pipe with Corsa 4.5” extreme mufflers.
I am seeing -10% LT fuel trims at idle while ST fuel trims are near 0%.
I understand ideally it needs a tune but am I doing bad things running it lightly in this current state? No check engine lights and currently awaiting the Evap monitor to pass.
thanks
Current mods are Kooks 1-7/8” headers and their Green Catted X-Pipe with Corsa 4.5” extreme mufflers.
I am seeing -10% LT fuel trims at idle while ST fuel trims are near 0%.
I understand ideally it needs a tune but am I doing bad things running it lightly in this current state? No check engine lights and currently awaiting the Evap monitor to pass.
thanks
Melting Slicks
Joined: Oct 2022
Posts: 3,340
Likes: 1,934
From: Ulta Vista, AZ
You absolutely %100 DO NOT need a tune.
It’s fine, don’t overthink it. Your o2 sensors will adjust fuel trims closed loop, and open loop pretty much every single car I have ever owned has been high 10’s afr stock. Even with longtubes, it will just just as rich.
It’s fine, don’t overthink it. Your o2 sensors will adjust fuel trims closed loop, and open loop pretty much every single car I have ever owned has been high 10’s afr stock. Even with longtubes, it will just just as rich.
