My 97 Thunderbird is rough idling. I cleaned the bank 1 02 sensor and it still has a rough idle. I can floor it and the idle goes away.

sure, when unplugged the MAF , the PCM goes to limp home
and mimics the dead or missing MAF.
one reason, of many
is the AFR is lean, with maf present
then you remove MAF and the mimic goes horrid rich. (normal effect)
this huge rich hides the true cause of horrid lean.

see? 2 wrongs, make a right in this case.

its a 97, why are you scan too free.
connect it and see it fail. and why?
see all sensors. here. same engine, same all.

http://www.fixkick.com/ECU/Authority/A_Full_OBD2_scan.html


air leaks on this engine cause, lean.
a dirty mAF causes, lean. (clean it with carb spray 1foot away never close up)
clogged injectors cause, lean.
low fuel pressure causes lean.

if you put all the parts back and scan it
you'd see that.
you'd see the 0xysensor (Front) stuck lean B1S1. bank 1 sensor 1
ignore B1S2.

try a new oxysensor front. first. so the scan tool can see true facts.

on a good engine, the 02 swings at idle
if that fails , i jump over that like at tick on a hound dog.
finding car parked and idling hot AFR issues, is easy with any scan too.
the EFI must be in closed loop at idle, hot, MUST.
is it>?
does the maf read right at idle, ?
1.5-4.0 grams per second
or MAF output pin volts of. 1.7-2.0 volts
if the voltage is good ITS NOT THE MAF, its LEAN AFR.
AIR FUEL RATIO IS AFR. lean means FUEL STARVATION.

if you gun the throttle
the maf goes higher.
3v or 20grams/second.

here is me driving see MAF hit 55 grams/ a second.
Hills. do that.
the more HP the more Grams /per second, until max engine torque is hit. and RPM max HP.

here is live data plot of a 96 MAF

http://www.fixkick.com/my96-16v/MAF-TPS.JPG

the blue line is THROTTLE ANGLE> im driving aggressive as heck.

if the maf tests good, its not the MAF>
its easy to test.

Clean your throttle body and map/maf sensor. If that doesn't work you may have a bad iac sensor (idle air control sensor)

Fuel Trim below Zero- your taking away fuel,
above zero your adding fuel

Should be plus or minus 2 or 3

You may have a rich condition from leaking injectors,
thus the -20

Mail them away to Ultra Sonic Cleaning

Check Fuel Pressure

P2195 & 97 is a lean condition reported by both O2
on right side

The pcm drove the fuel trim lean to correct for a over
rich condition on right bank only due to a leaking fuel
injector most likely

That is a common problem on an expedition with 5.4

I have seen people find & replace the bad injector
I would mail all of them away to be ultra-sonicly cleaned
& flow tested if it were mine

If you have a professional scan tool or software you woulod
see the issue on fuel trim.

The MAF is common to both banks & you only have an issue
on the right side so the MAF is okey

Your plugs should give some indication of the bad injector
if that is the case

Need details on brakes!!

Bad injector ?? Bank 2

Air leaking around injector -driving O2 Lean

2197--trying to correct for over rich condition

Coil misfires

TPS Sensor

MAF ?

You need to take out fuel
at least at idle

what was the code?

im having the same problem w my 97 bird... lopey or rough idle. no luck yet changed or tested many sensors already... if you have any tips let me know and ill do the same, [email protected] Thanks

Yes, replace the MAF, then check if the lean condition goes away. It should.

MAF's are sensitive to cleaning. Sometimes it works, other times it doesn't.

these O2 sensors are cat convertor check sensors. id be checking cat convertors and hopefully you should try replacing if not all ready is the front bank 2, O2 sensor
if you have scanner can you see fuel trims in data display to confirm high fuel trim only on bank 2 either +-5 or more indicates problem and if bank 2 sensor 2 has fixed high 700mv reading cat no good(warm idling)

Those codes are for the oxygen sensors, lean fuel mixture on both banks. Change them, problem with stalling and rough idle should go away.