1999 f250 sd v10. Getting po172 and po174 fuel trims out of wack. I have replaced iac tps cps fuel pump hoses the seemed bad no air leaks that I could find. Clean mas. Also tranney dot shift right
I ordered a new mass I don't know what the maf should read at idle. What else would
cause the fuel trims to be off. New o2 sensors. Seems to run better with the mass low
unpluged. At least the bank 1 and 2 sensor 1 will switch rich lean. When pluged in is
where the freeze. And get 172 and 174 codes. And during the koer test I get the iac
malfunction. Been replaced 2 times .
Rich on both banks. Coolant temp.sensor or fuel pressure regulator.
Rear speed sensor in rear end or transmission filter dropped down.Change filter and fluid drain torque converter.
Looking for a Used F-250 Super Duty in your area?
CarGurus has 44,898 nationwide F-250 Super Duty listings starting at $1,799.
Search Ford F-250 Super Duty Questions
Ford F-250 Super Duty Experts