1999 ford expedition is running rich fuel air mixturehow do I adjust or fix problem.

You didn't mention where you are - under good conditions you should expect around 35 miles per US gallon for highway driving and around 24 in town. A US gallon is smaller than the Imperial gallon.

If you are principally highway driving, your car is probably using double the fuel it should and if it isn't leaking somewhere, the engine must be running so rich it could hardly be running smoothly and that must be causing damage - increasing engine wear and damaging the O2 sensors and the CAT and possibly fouling the spark plugs...
I expect the performance is also way down...
The most surprising thing is you aren't also complaining the check engine or other light is on - you aren't so maybe it isn't? You didn't mention any of this sort of stuff so maybe it is running ok?

I suggest you check your fuel system for leaks as a matter of urgency and then perform an accurate fuel consumption check and post again.

Hello,
P1132 = Lack of HO2S11 switch. sensor indicates rich.
The HO2S11 is the upstream oxygen sensor. ( upstream meaning it's before the catalytic converter.)
This sensor is telling the ECM, ( electronic control module ), to increase the fuel, which is why it's indicating RICH. ( the fuel/air mix ratio should be 1 part fuel, 14.7 parts air )
The most common reason for your issues are the following.
1. Dirty air filter.
2. Faulty/dirty idle air control valve.
3. Faulty/dirty MAF, ( mass air flow ), sensor.
Until you're able to get this fixed, you are going to get poor fuel efficiency

I hope this helps you.
Thanks, Donnie

The tune-up is a Fred Flintstone term,
meaning you got spark plugs or payed
for them and got nothing

You need new spark plugs
You need 2 new front O2 Sensors, if you
have 100,000 miles on them
You need the MAF Sensor Cleaned
A Clean Air filter
Correct fuel pressure
A properly working TPS Sensor
(throttle position sensor)
And other items.

See if you have all that done, and get back
I will evaluate your issues.

Do you have check lights on the dash
If so give us the codees

I have a 99 explorer with V8 that runs great! and I get
a whopping 13mpg. But it has high miles. So I was
going to change the catalytic converters as they may
have started to plug up. And any exaust restriction
will drop your mpg, even a bent tailpipe will cause a
drop. There are other possible reasons for this, such as the o2 sensor sending a signal to the pcm calling
for a more fuel rich, air fuel mix than neccesary. Or
the temp sensor failing to signal that the engine is
at operating temp, and stays to some degree in cold
start mode. But either of these conditions would be
noticed through dtc codes- a smell or engine performence. I hope I was of some help.
Good luck.

todytwo

YOUR AIR MASS SENSOR CAN OR YOUR OXYGEN SENSORS WILL DO IT OR U MAY JUST NEED A COMPLETE TUNE UP WOULD TRY REPLACING OXYGEN SENSORS AND GIVING IT A COMPLETE TUNEUP

Engine is still tight.After being run in, it should be the same fuel consumtion

you cant adjust fuel on the ford governor its fixed.you can adjust fuel on cummins governor.have your governor injection timing check .make sure air filter not stopped up or restricted.it will cause it to run rich.

Might be the fuel Inj. or spark plug. I had the same prob on the #7. Changed Pack, inj, and plug and it fixed it.

use the air and gas flow adjustments on the side of the carburator to adjust the rich/lean flow of gas. there is a srew on each side of the carb to adjust one is for air the other for fuel. the one on the driversside is for the fuel and the one on the passenger side is for air. you have to turn them slowly til you get the desired results