Troubleshooting P0171 Ford - Ranger 2.5L 1998

Question

Please I need specific help for repairing my Ford Ranger 2.5L 1998 manual transmision. I have been seeking for a final solution by 2 years. No qualified technicians in my area. The Main control unit (car computer) was stolen!. Then a remanufactured one was installed in my car. 6 montes later all of The air intake system was stolen again! and the original service parts were found and installed. Then after 4 months problems with the cooling system and now the dash panel calefaction radiator is bypassed until replacing with a new one. These last two years the truck has been stopped. Now there are excessive knocks and fuel consume with low power. please help!
Thanks in advance
regards

Answer 1

P0171 Fuel trim lean

Vacuum leaks are mostly the main cause of lean code condition, When you have a lean fuel trim this is a condition that the engine has

This would be a vacuum leak,here is a PCV hose, this one split , look for vacuum hose that are torn disconnected or just ruptured