I get the follwoing codes P0171 and P0174 System adaptivefuel too lean (Bank 1) and (Bank 2) respectively. Any ideas on how to repair the problem?
Here’s a handy link:
AFAIK, Rangers with the 4.0L have a history of upper intake manifold vacuum leaks. I’m guessing that’s what you’re seeing.
Awesome link. Thanks for the advise. I have not had a chance to work on it since I received the response, but will keep you posted when I do.