Lean code problem

[Chavez38]

I have a 2019 mustang gt premium I recently put a jlt cai and lund tune but I keep getting lean codes which now turned into a misfire lund says my tune is perfectly fine my local shop says everything is good mechanically can anybody please help me with this issue tia

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[K4fxd]

Lund tune.

Friends don't let friends buy Lund tunes.

They probably grabbed the wrong CAI file and won't look at it because it's never their tune. (sic)

Might have another shop double check for leaks, but most of these Lund tuned problems are fixed with another company tuning the car.

 

[Paddles]

I recommend a different tuner

 

[Chavez38]

Lund tune.

Friends don't let friends buy Lund tunes.

They probably grabbed the wrong CAI file and won't look at it because it's never their tune. (sic)

Might have another shop double check for leaks, but most of these Lund tuned problems are fixed with another company tuning the

 

[Chavez38]

Lund is the second person I've had tune it so I don't think tune is the problem plus I datalogged it with lund everything was fine

 

[K4fxd]

I datalogged it with lund everything was fine

Then it shouldn't pop a code. Something is not right.

Does it throw the code with the stock airbox and stock tune?
Can you post logs?

 

[Chavez38]

Then it shouldn't pop a code. Something is not right.

Does it throw the code with the stock airbox and stock tune?
Can you post logs?

 

[Chavez38]

Well I sent a datalog to lund they said it could be a di injectors problem but my shop did fuel pressure tests on everything and it's fine...its weird cause it drives fine for awhile then throws these codes when it was stock it ran fine no codes they sent me a tune for my stock airbox gona try that and see what happens

 

[Chavez38]

This is 1 of my logs

 

[Racer5973]

I have a 2019 mustang gt premium I recently put a jlt cai and lund tune but I keep getting lean codes which now turned into a misfire lund says my tune is perfectly fine my local shop says everything is good mechanically can anybody please help me with this issue tia

Vacuum leak!

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