The fact that you have a lean code makes us think you have a vacuum leak but that normally comes with a rough idle. However, we still need to check it out. here is a guide that will get us started:
https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers
Next here is guide that will help with finding a vacuum leak:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
However, just because there is a lean code does not mean that we have an air issue. This could be due to a lack of fuel which would fit better with what you are seeing.
Let's check fuel pressure and go from there. Here is a guide for that:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Lastly I attached the testing below that we need to run through however it pretty much takes you through what these guides are doing.
Let us know what questions you have. Thanks
Images (Click to enlarge)
Dec 20, 2020 at 10:03 AM
