Dune Runner
New Member
- Joined
- Oct 4, 2012
- Messages
- 385
- Reaction score
- 1
- Points
- 0
- Location
- Alpine, Ca
- Vehicle Year
- 1999 4.0
- Make / Model
- Ford
- Engine Size
- 4.0
- Transmission
- Automatic
Ok 99 4.0 OHV. So far this truck has had the fuel pump, MAF, TPS, Intake gaskets, two O2 sensors, Injector O rings, replaced.
Two independent shops and the dealer have gone through the truck. The PCM has been reprogrammed with updates. It has been checked for vacuum leaks many times. I even checked myself. I reset the ECU and within two days the CEL is back on.
Im stumped. The truck runs great and otherwise has no problems running ,starting , idling or driving.
Any ideas? It's been smogged and won't be due again for two years so it's not a pressing issue but Im anal about things and it bugs the crap out of me not knowing what's wrong. BTW this truck came stock with no EGR system. The codes are lean bank 1&2.
Two independent shops and the dealer have gone through the truck. The PCM has been reprogrammed with updates. It has been checked for vacuum leaks many times. I even checked myself. I reset the ECU and within two days the CEL is back on.
Im stumped. The truck runs great and otherwise has no problems running ,starting , idling or driving.
Any ideas? It's been smogged and won't be due again for two years so it's not a pressing issue but Im anal about things and it bugs the crap out of me not knowing what's wrong. BTW this truck came stock with no EGR system. The codes are lean bank 1&2.