Ok guys, I'm still having the p1131 problem. However for the past few days I have been reading up and learning how to properly use diagnostic equiptment to read live data, and have been able to rule various things out, but I am still pretty stumped as to what the problem could be, so let me run a few things by you all.
The symptoms I am having are all intermittent and include, bogging down in all gears at all rpm's hesitation, severe lack of power and high fuel consumption. Along with code p1131. I am able to clear the code and it might be a few days before it comes back or it might come back in a few hours.
With the diagnostic equiptment I have logged the following live data at idle:
Fuel status closed loop
STFT1 +36%
LTFT1 +0.8%
O2 b1 0.63v (fluctuates between 0.1 - 0.9v)
MAF 4.3g/s (Does drop to 2.8 after a while at idle and stays there)
RPM 843
Absolute throttle 18.4%
The thing is the above values happen as soon as the car goes into closed loop. The stft shoots up very fast to over +30%. If I rev the car up the stft dosen't drop at all but stays still at over 30%, which I believe rules out air leaks? Now if I set off driving after about 30 seconds the stft will drop and fluctuate between -2 to +2 as does the ltft, which I believe is normal and pretty good. The o2 voltage also fluctuates betwen 0.01 - 0.09 which I believe is also normal. If I pull over and idle again everything is fine and the trims and o2 voltage stay well within normal and the car idles smoothly. If I now turn the car off for about a minute and start again the car will be in open loop and as soon as it goes into closed loop the stft shoots up over +30 again!!! Then will drop again after a little driving!! I also noticed on the scanner that I was idling in closed loop and the car went back into open loop and the trims shot back up, so I gave a little tap on the accelerator and it went back into closed loop and the trims dropped again.
I have recently changed the cts, and thermostat, had the timing belt done and replaced the rocker gasket and put in new motorcraft plugs.
So there you have it! It certainly has me stumped! Any ideas from you guys?