The idea that you have a lean mixture is usually the result of only a few things. The most common is an engine vacuum leak. The second is a weak fuel pump. And last, a faulty engine coolant temperature sensor can cause issues.
So, if you have a live data scan tool, when the engine is cold, check the ECT signal. The temperature listed should be very close to ambient temperature. If that checks good, let me know what the short-term fuel trims are.
If you don't have a live data scan tool, first check for an engine vacuum leak. Here is a link that explains how to check:
If no leaks are found, check to see if the fuel pressure is within the manufacturer's specifications. Here is a link explaining how to test:
Let me know what you find, if you have other questions, or if you have other questions.
Monday, March 21st, 2022 AT 8:49 PM