Lean Fuel Trims

[Number4]

Still dealing with lean fuel trims on my ‘04 Ex 4.0

Finally took it to the dealer which has turned out to be a huge mistake. Wasted 11 days and spent $1k.

They claimed the bank one injectors weren’t set properly (even though the car ran fine for 30k miles) so they replaced the seats and seals. I picked up the car and the fuel trims were still at +15.

Bank 1 +15
Bank 2 + 6

Could a weak fuel pump be the cause?
I can’t afford to not have the car any more.

 

[94Eddie]

Whenever I read a fuel trim related question I typically post the two videos shown below. They will help to understand fuel trims and how to use the readings to help identify the potential problem.