I am trying to get this truck to pass the state or New Mexico's emission test. This is a 2003 4.2 L V6. F-150. This was originally a fleet truck that came from KY. The first work done to get it to pass was changing the O2 sensors. First test, before the sensors were changed showed P1131 ,P1151, P0171, and P0174. After changing the O2 sensors, it showed P0113, and P1289. I had missed hooking the sensor in the air intake nearest the throttle body up. Had it checked at Autozone and all seemed well. Next test threw P0174 bank one fuel to lean. During changing the driver side O2 sensor I accidentally pulled the wiring out of the Block temp sensor. When I replaced it, the new sensor snapped off at the block, leaving only the tip screwed into the block. This caused the temp idiot light to come on, and it failed again.The internal wires weren't separated, so I plugged this part in, and the light went off. Of course the gauge doesn't register a temperature, and I don't know if this affects what the PCM is seeing regarding the fuel mixture. Does it? The last test showed no faults, said the engine hadn't been run long enough, failed yet again. Decided to drive it for at least 15 minutes. During the trip the Engine light came on, at Autozone It showed the 4 original codes, with a comment that the IMRC actuators may be the culprit. Do I need to try and extract the temp sensor tip from the block and replace it? Then see what codes it may show? Changing the temp sensor now may be a nearly impossible task given that the sensor is on the back of the block at the firewall. If all else fails, is there another port on the block I could use to install a new sensor? I would have to extend the wiring, but that isn't that big a deal I don't think. Any help is certainly appreciated. Bob G.

 

At the risk of insulting you, here goes.
First your workmanship is a bit rough from your detail.
Second you don't understand the operation..
The 171/174 codes are a vacuum leak into the intake tract. Very often the intake bolts and separators. Once you have the intake removed, fix the coolant sensor problem and address the IMRC linkage and driver issue.
The Ox sensors detect the vacuum leak and richen up the fuel tables. This sets the codes.
The IMRC code is a fault with mechanical operation of the control rods in the intake ports.
The coolant temp sensor Is a different issue.
You have at least 3 separate issues at the same time.
Good luck.

 

Thanks for the explanatin as to what caused the issues. Couldn't find that info anyplace I looked. BTW, where in the bluegrass? Yesterday was the BBQ festival in Owensboro. Sure would be nice to have some mutton for MD.

 

We moved from Utica, (just south of Owensboro) to Rio Rancho, NM 2 years ago in Feb.

 

How many Hg should I be holding at 5600 feet ASL? I am thinking 11-12 but not sure.
Also, will the temp gauge not showing a temp show up as a code that will impact the emission test?
BTW, my workmanship really isn't the problem, I barely had any pressure on the temp sensor when it snapped off, after looking at it, it appears that it is pressed together rather than the tip and nut being one piece like the original. when I get this extracted I will opt for a more robust temp sensor. When you say a vacuum leak into the intake tract, most likely is that the plenum or will I have to go deeper and take off the manifold? I guess it could be just a punctured or split vacuum hose.
Thanks in Advance for your help.
Bob G