fuel trim

Hello All, I've been a lurker on these forums for awhile and always found them helpful, but this issue has been stumping me for awhile and I want to verify with others where I think my next step is. Please read through everything if you have time to understand what I have done and things I've...

I had posted earlier about lean codes on my '00 Explorer Sport, and fixed it easily by replacing an evap hose. Well, now P0174 (bank 2 lean) is back and I can't figure out why. It appears intermittently and only on this bank. I have done the following: -I smoke tested again, and there's no...

Hello, I am currently working on my wife's 2005 Sport Trac 4.0L SOHC. I am trying to read the long-term fuel trim values on my scan tool, but the PIDs do not seem to register any values. The short-term trim, engine coolant temp, and any other PID seems to be working fine, but there is no value...

Hi all. I am having some trouble with my explorer with bad fuel millage and decreased performance under load. It currently has 124000 miles on it, but I am unable to figure out the problem. Looking at the real time data I have noticed that the LTFT on both banks are about 20%. Also I checked...

I would appreciate any feedback on this issue. I have a 1997 4.0 OHV that is throwing P0171 and P0174 codes, and the scan tool data is unusual. Looking at OBD live data, the STFT and LTFT both show -100.0 for bank 1 and 2. Not changing with time or RPM. Also, O2 sensors are registering 0V...

So I have a 1998 Ford Explorer, 4.0L OHV (VIN X) with 129,000 miles. CEL came on and the idle got rough. Had the codes checked and came up with P0171 and P0174, lean bank 1&2. I replaced the upper and lower intake gaskets as well as the EGR o-ring. While I was in there I cleaned the intake...

So I have a 98 Explorer, 4.0L OHV, VIN X (from Canada), 130,000 mi. Rough idle CEL on and off for a few months. So found a vacuum leak under the air plenum changed the intake gaskets, rebuilt injectors, new plugs. Still rough idle. Checked the IAT sensor, no continuity, replaced. Still rough...