Question about 1999 Ford F150 Regular Cab

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Truck has surging idle when cold scanner says bank 2 running lean whats wrong with it?

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I found this on two 1999 F150 trucks with 5.4L. One was mine. There is a vacuum hose on the back passenger side of the engine that is about the size and length of your thumb. With age, this hose will collapse and then develop a vacuum leak. It can be pretty load if leaking.

Posted on Jun 22, 2010

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97 toyota surges at an idle


(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.


Jan 07, 2014 | 1997 Toyota Tacoma

1 Answer

O4 sebring, PO175, PO174 codes?


Sounds like a problem with one of the O2 sensors.
Code 174 is bank two being too lean, and 175 is bank two being too rich. The computer tries to keep the fuel mixture switching back and forth between rich and lean. If the sensor is "lazy" the computer will make the mixture too rich or lean trying to get the sensor to react.
A mechanic can watch the sensor performance with a scanner to see what they are doing. You have two sensors on each bank.

Apr 06, 2013 | Cars & Trucks

3 Answers

What causes the computer to read bank 1 to lean, bank 2 to lean. It also idles rough and will stall out while stopped. Runs great at operating speeds. It's on a 2004 F150, 4x4, 5.4 vin code 5.


More than likely you have a vaccume leak.Check arround the intake looking for any broken vac.hoses(especally the PCV hose) all the way up to where it connects to the intake.Could be a bad mass airflow sensor, but more likely a vac. leak.

Apr 21, 2011 | 2004 Ford F150

2 Answers

2000 Lincoln Navigator - few days ago started idling very rough when truck is at a stop or in park. Service Engine Light came right around time I noticed that it was idling rough when stopped. Following...


P1131 Lack of HO2S-11 Switch ,Sensor Lean
P1151-Lack of HO2S-21 Switch ,Sensor Lean
PO171- System to Lean (Bank 1)
PO174-Systen to Lean (Bank 2)

Fuel Filter -Plugged
Low Fuel Pressure
Evap System -Leaks
Leaks - in ducting,air filter to throttle
PCV -Leaks
Exhaust System -Leaks
O2 Sensors-worn out

Apr 06, 2011 | 2003 Lincoln Navigator

2 Answers

My 2006 Chevy Silverado 1500 5.3 L engine surges +/- 200 rpm between 30-59 mph in final drive gear...in lower gears runs fine. No check engine light or computer code generated until recently which showed...


a bank 1 or a bank 2 generally means an 02 sensors bad. or you may simply have a faulty gas cap. i would try the gas cap 1st,make sure it's tight, the engine running for a few minutes,then cut engine off. then open gas cap,do you hear pressure [air] releasing from the fuel tank? ok if not that,then if bank 2 is really bad,your check engine light would be on. but if the idle control sensor is bad,no light would be on at all. and it[engine] would idle up and down.or would'nt idle at all,or would idle up and down,just like what you've described. good luck and thank you for choosing fixya.com and please let me know if i'ved assisted you!

Feb 20, 2011 | 2006 Chevrolet Silverado 1500 2WD

1 Answer

Engine misfire first 1000 rpm, engine flooding out, check engine light is on but flashes when in motion, scanner shows system too lean bank 1 and 2. shows multiple cylinder fault codes.. (FORD F-150...


my 2002 ford f150 4.2 would not hold idle so we changed the fuel pump and fuel filter and relay now the truck starts holds idle runs good at low rpm but when i stomp it it runs then stalls and picks up again.

Dec 05, 2010 | 2002 Ford F150 Regular Cab

1 Answer

98 Lincoln Navigator Check Eng light on


fuel pump is going out causing the truck to run lean and miss

Aug 22, 2009 | 1999 Lincoln Navigator

1 Answer

2001 Ford Explorer Sport running too lean in both banks


any of those sensors can cause that but the best thing to do is scan it or check for a vacuum leak with a smoke machine.

Jul 22, 2009 | 1998 Mercury Mystique

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