Fuel Trim Inquiry (1 Viewer)

[renyon99]

May I ask, what are the opinions on these numbers? I thought I read in the past (not on mud) that something near 10% on fuel trim wasn’t good…but I could be mistaken.

2014 LC 125k

Snapshot= at idle in park, after driving home from the office (~20miles)

Thanks in advance!

 

[TeCKis300]

May I ask, what are the opinions on these numbers? I thought I read in the past (not on mud) that something near 10% on fuel trim wasn’t good…but I could be mistaken.

2014 LC 125k

Snapshot= at idle in park, after driving home from the office (~20miles)

Thanks in advance!

View attachment 3292114

I'd generally agree that being withing +/-10 fuel trims is within the realm of normal. Trims are by design to accommodate variables and wear and tear to various components. As the trims between the banks agree, there may be a common component that is affecting both.

That said, your 2014 is in the Denso fuel pump recall range. Even if you don't have drivability issues, If you haven't had the recall done, I'd pursue getting it swapped.

Here's some more info on fuel pressures and the recall notice in this thread

P0171: System too Lean (Fuel Trim)

Working through this and could use the hive minds support. P0171: System too Lean (Fuel Trim). Also P0300: Random/mulitple Cylinder misfire detected. Multiple specific cylinder misfires P030x. Symptoms: In diagnostics after getting home. LT fuel trim on both banks at idle are high. +15 and...

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