Effieman
Member
- Joined
- Sep 27, 2018
- Messages
- 48
- Reaction score
- 1
- Points
- 8
- Location
- Mt Vernon WA
- Vehicle Year
- 1998
- Make / Model
- Ford
- Transmission
- Manual
Got the old P0174 code along with P0171 pending code on my 98 4.0 again.
LTFT both stay around 25 with STFT at +/- 10 while at idle and at freeway speeds. MAF seems correct @ 3.9 g/s at idle. O2s seem normal.
The only thing that seems to be off is the intake air temp, was at 109F when engine was 188F and been running for an hour.
Can't find the chart I've seen before for what the temp sensors should read (resistance) for what temp... And keep forgetting to check the computer for air temp when cold.
Does the intake temp make that big a difference on fuel trims?
Any other help appreciated......
LTFT both stay around 25 with STFT at +/- 10 while at idle and at freeway speeds. MAF seems correct @ 3.9 g/s at idle. O2s seem normal.
The only thing that seems to be off is the intake air temp, was at 109F when engine was 188F and been running for an hour.
Can't find the chart I've seen before for what the temp sensors should read (resistance) for what temp... And keep forgetting to check the computer for air temp when cold.
Does the intake temp make that big a difference on fuel trims?
Any other help appreciated......