02 ford focus svt high,lean idle

Pull out the spark plugs their is probably oil or water in the well surrounding plugs. Cheap eaasy fix for water just dry it out. oil? Replace valve cover gasket .

How high is the idle? Any roughness? Some ideas who by the control the butterfly valve on the throttle, or the MAF (mass airflow sensor)

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.

(which engine. ?????)_
as always check all fuses. and scan the ECU for DTCs. first.
there is no need to fix OBD2 cars like 1980 cars (hard rows to hoe)
it can be 2 problems this......
lets fix the easy one first. idle. (and hope for moving issues to fix for free) it idle car is parked, so is 100% safe tests. (not moving)

so it surges at idle.
questions.?
1: hot or cold or both.?
2: low extreme RPM and high at idle.
400 to 800 RPM? surge.
1000 to 2000. what? numbers tell the tale.

first off, idle is the last thing to work right on any engine.

there are many ways to find what is wrong.
fix idle surge way.
i make sure that the engine holds closed LOOP status.
hot idle, if not , i fix that first.
keep in mind if not in closes loop and lean
all lean engine surge and guess what the ISC will add to the surge
because idle is way too slow, so the ECU open the ISC wider
and wider and its still too slow, so the ECU resets the ISC
this cause a worst hunt (surge)
the ECU adjust spark time and the ISC to get 800 rpm. (spec. look up yours)
so say , i see closed loop failed, OBD2 scan page 1
i look at the O2 sensor an its stuck lean.
if stuck lean and it really is (o2 bad?) then its lean and it will surge
.
examples.
1: i find 02 sensor bad, (only effects idle and light steady cruise)
2: i find fuel pressure at 15PSI , hopeless low .
3: i find all injectors clogged. and lean.
4: with MAF EFI, ( i find maf reading too low, (dirty) causing lean.
5: if MAP car, i find the MAP stuck hard high vacuum causing lean.
not knowing what engine you have or the idle hot surge range,
i can not go farther.

the driving bog tells me,
1: scan the ecu ,get DTCs; do that first.
2: clean MAF if car has one, ask how..
3: check fuel pressure.


my guess is engine is lean. and starving for fuel all the time.
cept WOT.

MAF cars starve for fuel if there are any vacuum leaks.
MAP cars do opposite, they race fast with 100% full power.
MAF is air density EFI
MAP is speed density EFI.
apples and oranges diffr. so what engine.

Daniel, what about the second 02 sensor? Have you taken a look at it? I'd check that and get new coils when you replace the plugs.

For this types of problem,there are few help inks to troubleshoot the problem.Click the link below to go through the troubleshooting procedure to resolve the issues :----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html-----------van idles rough? http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html
--------------runs lean and idles rough? http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html
-----------Car still runs Rough after tune up? http://howtobyme.blogspot.com/2011/12/car-still-runs-rough-after-tune-up.html
------------Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed? http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
----------High rpm in neutral? Inconsistant high RPM in neutral? http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
------------Engine Backfires? http://technoanswers.blogspot.in/2012/02/jeep-backfires.html----------- Nissan stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

-----------
Nissan Pathfinder Backfires? http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
---------How to adjust rpm? http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
------------Engine cuts out at 3000 RPM? http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
----------This will help.Thanks.

Check o2 sensors they control your fuel delivery

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

the MAF (mass air flow) meter may be faulty, this is typical of the symptoms you are getting. It is just after the air filter in the large bore pipe leading to the inlet on the engine, not a cheap part but you may get one on ebay, just remove and unplug the original and swap it.

Idle air control valve