Hi,
The reference to "bank one" is usually used on a v6 or v8 engine. There are two sides to the engine, so they have two banks.
On your vehicle, there is only one bank because it is a 4 cylinder.
Since you have a lean mixture, chances are there is an engine vacuum leak or low fuel pressure. To get you started, here is a link that explains how to check for and repair an engine vacuum leak:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
If no leaks are found, I recommend testing the fuel pressure to confirm the pump is producing what the engine needs to run properly. Here is a link that shows in general how it's done.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
If you look at the attachments below, they provide the directions specific to your vehicle. Additionally, they include the manufacturer's fuel pressure specifications.
I hope this helps. Let me know if you have other questions.
Take care,
Joe
See pics below.
Images (Click to enlarge)
Sep 24, 2021 at 10:12 PM
