Fuel Pressure Regulator? Fuel pump?

[heavy crypt]

Hi yall,

I just did stage 1 tune and sent the log to tuner.
He told me that my car is lean, when WOT over 4500RPM.

Something is restricting my fuel pressure, so they sent me a new file with lesser boost until it sorted out.

Now I need to find what should I replace.

Fuel pump sounds fine, never stuttered or feeling sluggish recently, so I am unsure whats the issue.

Fuel filter is replaced and my engine and fuel pump is 74000mi old.

Can FPR can cause WOT lean?

I am uploading log file from my ECU during pull.

[mossy quiver]

This would be done with monitoring pressures

Just because the fuel pump is not “feeling sluggish” doesn’t mean that it cannot keep up or put out what is now needed.

You have to get some gauges on the car to truly know what is going on.

[heavy crypt]

Cool. Unsure how can I check fuel pressure under WOT load. Will revving up work?

[mossy quiver]

You had a tune you said? When the car was tuned, was it dynod and hooked up to monitoring equipment?

[heavy crypt]

Its a E-tune so basically I send them my ecu stock file and they send me base file, I flash it and record log file while driving, etc

So they sent me file with reduced boost file to prevent damage of my system, didnt flashed it yet