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

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Asked by Joe Nov 16, 2013 at 09:54 PM about the 1999 Ford F-250 Super Duty XLT 4WD Crew Cab LB

Question type: Maintenance & Repair

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 .

2 Answers
44,955

tuff4x4 answered 10 years ago

Rich on both banks. Coolant temp.sensor or fuel pressure regulator.

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44,955

tuff4x4 answered 10 years ago

Rear speed sensor in rear end or transmission filter dropped down.Change filter and fluid drain torque converter.

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