Hi CSTEINER866,
We would need to confirm it is running lean with checking codes but the fact that it is running lean on both banks after they "sealed" the engine, I would have to assume they missed something or their repair failed.
Did they give you a list of what they sealed and how?
If you have a lean misfire, the most likely cause is vacuum leaks so you can check this by spraying some carburetor cleaner around the engine to see when the RPM raises. The detail is explained in these guides:
https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
Please let me know if you have other questions or let me know what detail they gave you.
Jun 12, 2019 at 8:21 AM
