Hi to all,
I need to know the PCM pinout diagram, or the exact O2 sensor wiring - what are the connector pins on PCM? My car is the 2003 5.4 Expedition.
Thanks for any idea...
limo.

 

Why what happened ? Burn up a harness, - or some wires?

 

I need to bypass the O2 signal because running on E85 which makes the signal lean - the CHECK ENGINE is on and the fuel economy to high. A bypass device multiplies the low E85 O2 output (0.03 - 0.1V) to regular 0.3 - 0.7V and the PCM is happy..

But where´s the O2 input to the PCM?

 

If it's not a flex fuel engine, you need to do a heck of a lot more than that to be able to run E85 without engine damage.

 

I run all my cars on E85 since this fuel is available here - it´s 5, maybe 6 years, and I do not believe on the flex-fuel urban legend... My first E85 car was (and still is) a ´96 Caddy Fleetwood with OBD2 and California emissions, still running on ethanol and still no probs, even without any modifications. Some later cars demanded some "tuning" - the O2 bypass did it (together with K&N air filter and pulse spark plugs). That´s really all - spend few bucks and enjoy lot of fun ! The truth is, I mainly drove GM´s, this is my 2nd Ford (after a short intro with 4.0 Explorer 3 years ago)... Am I doing what wrong?