2nd Ranger
New Member
- Joined
- Aug 25, 2018
- Messages
- 3
- Reaction score
- 0
- Points
- 0
- Vehicle Year
- 2003
- Make / Model
- Ford Ranger
- Transmission
- Automatic
I've got a 91F250 that is driving me crazy.
New spark plugs
New Rotor
Wires OK
New O2 sensor
EGR clear, new gaskets to upper manifold and throttle body.
Idle air checked and cleaned
New EGR vacuum regulator
Found leaking line to secondary air bypass and repaired.
Secondary Air bypass solenoid works correctly as does the secondary air bypass valve.
Will pass smog if vacuum is applied to EGR valve so CAT OK
High NOX without EGR in the on position.
No DPEF sensor on this truck
Checked old MAP sensor and temporary swapped a new one, no difference.
Temporary swapped a new EGR position sensor, no difference, reinstalled old one.
Not sure what feedback loops turn on Vacuum to EGR but that's my only known issue now preventing passing smog. Did not replace the control module between wires and solenoid. Does that part fail?
Could I have low voltage from the ignition to one of the circuits not needed to start and run the truck? Chime is very faint with key in and door open.
Cruise control does not work. Rear fuel tank won't feed properly. Front Fuel gauge won't read properly.
I have read it could be the PCM.
Looking for advice on possible causes I've missed.
Thanks for any help you might be able to give me tracing this problem. 2nd Ranger out....
New spark plugs
New Rotor
Wires OK
New O2 sensor
EGR clear, new gaskets to upper manifold and throttle body.
Idle air checked and cleaned
New EGR vacuum regulator
Found leaking line to secondary air bypass and repaired.
Secondary Air bypass solenoid works correctly as does the secondary air bypass valve.
Will pass smog if vacuum is applied to EGR valve so CAT OK
High NOX without EGR in the on position.
No DPEF sensor on this truck
Checked old MAP sensor and temporary swapped a new one, no difference.
Temporary swapped a new EGR position sensor, no difference, reinstalled old one.
Not sure what feedback loops turn on Vacuum to EGR but that's my only known issue now preventing passing smog. Did not replace the control module between wires and solenoid. Does that part fail?
Could I have low voltage from the ignition to one of the circuits not needed to start and run the truck? Chime is very faint with key in and door open.
Cruise control does not work. Rear fuel tank won't feed properly. Front Fuel gauge won't read properly.
I have read it could be the PCM.
Looking for advice on possible causes I've missed.
Thanks for any help you might be able to give me tracing this problem. 2nd Ranger out....