My mom's 2000 Ford Ranger (4.0 V6) is showing codes for Bank 1 and 2 running lean. What is the most likely cause to have these two codes at once?
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NFB: What would cause both banks to show running lean at once?
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Originally posted by Joe 1320Abnormally low fuel pressure, faulty throttle position sensor, faulty MAF, faulty coolant temperature sensor, severe vacuum leak or any combination of the above.2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning
1995 Z28, many mods, SOLD
A proud member of the "F-Body Dirty Dozen"
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I worked on a 4Runner with a lean code in both banks...
Obviously, I started out filter...didn't work. Did a nitrogen smoke test, found a small vacuum leak at the TB...didn't work. Finally decided on a MAF...fix it. I tried cleaning the MAF first but didn't work either. Other than the SES, the 4Runner ran like champ...so eh.
I would definately start out with the cheap fixes first...
How many miles do you have on the Ranger?
Christopher Teng
1999 · A4 · 3.73's · Auburn LSD · Whisper Lid · K&N · Pacesetter Headers/Y-pipe
Magnaflow Cat & Catback · MSD Coils/Wires · Bosch +4 Plugs · EGR Bypass
B&M SuperCooler · 160* Stat · Descreened MAF · SLP CAI · BMR STB & SFC
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F-Body Dirty Dozen
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I;m guessing both indicated lean at the same time?
Its probably one of what Joe said, someting to do with fuel delivery.-Alex
1995 LT1 ECU (GREAT for flashing!)
ZO6 wheels (clones)
LED exterior and interior lighting
With questionable guts:
Forged bottom end
free flowing 3 1/2" exhaust w/
pacesetter longtubes
T56 with a 6 puck ceramic copper heavy duty clutch
Built T56, 3.5" 4130 driveshaft w/spicer HD's
K&N RAM air from 96 ws6
96? ws6 hood
96? ws6 spoiler
full emissions delete
polished heads with oversize valve job
Edelbrock IAS shocks
Full tubular Chassis minus k member
Daily Driver and love it that way
Motor is not what you'd think.
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Maybe the O2's are contaminated. use any rtv sealant on anything recently?
anything else that could damage the o2's at the same time?
Check those sensors I say, but just go with fuel pressure/volume for now. It still could be something else though.-Alex
1995 LT1 ECU (GREAT for flashing!)
ZO6 wheels (clones)
LED exterior and interior lighting
With questionable guts:
Forged bottom end
free flowing 3 1/2" exhaust w/
pacesetter longtubes
T56 with a 6 puck ceramic copper heavy duty clutch
Built T56, 3.5" 4130 driveshaft w/spicer HD's
K&N RAM air from 96 ws6
96? ws6 hood
96? ws6 spoiler
full emissions delete
polished heads with oversize valve job
Edelbrock IAS shocks
Full tubular Chassis minus k member
Daily Driver and love it that way
Motor is not what you'd think.
Comment
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My first guess would be fuel delivery, clogged filter, or, at that mileage, clogged injectors-
Next would be an air leak- you're correct in that a vacuum leak would probably make it idle poorly, what about an air leak in the exhaust? That would make the O2 sensor see excess oxygen, thinking that there was a lean fuel condition-
How does it idle? Steady, at low RPM's, or does it surge and hunt?2001 Z28 A4 - 160 deg t-stat, 3.42 gears, WS6 sway bars, rear springs and shocks, UMI SFC's, Torque Arm and STB, leather Firebird seats, Borla, SLP Y-pipe and lid, ZO6 cam and springs - 332 RWHP and 346 RWTQ, not bad for 'almost stock' - work in progress
"Black, the fastest color"
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Now that I have had some sleep the brain is going a little better.
Another problem Fords and that engine specifically have is the idle air bypass valve gets carbon in them and get stuck. Usually they stick closed and cause a rough rich idle but I don’t see why they couldn’t stick open and make it run lean off idle and still idle ok. I guarantee if you took it off and cleaned it that a ton of carbon crap would come out.2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning
1995 Z28, many mods, SOLD
A proud member of the "F-Body Dirty Dozen"
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Dave - its the MAF sensor, for whatever reason they get dirty, happed on my dads 96 3.8L Thunderbird and now has happened on my moms 02 Explorer Sport (4.0L) they make a MAF cleaner, and you will need tamper Torx in a 6point to get the sensor off. almost every ford i worked on that had this problem was the sensor
the one exception is when my dads headgaskets blew on the thunderbird2009 Honda Civic EX- the daily beater
old toys - 1983 trans am, 1988 trans am, 1986 IROC-Z, 2002 Ram Off-Road, 1984 K10, 1988 Mustang GT, 2006 Silverado 2500HD
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It seems to idle and run fine, and I can't detect any exhaust leaks with my highly calibrated ears. I'm leaning towards fuel filter/injectors, or MAF. Nothing has been added that could have contaminated the O2 sensors. I'll definately try cleaning out the throttle body and IAC too, as that's the cheapest fix. My mom doesn't drive the truck much, especially in winter. So it'll probably be a spring project to track down the problem.Dave M
Life, liberty, and the pursuit of all who threaten it!
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Originally posted by Dave MIt seems to idle and run fine, and I can't detect any exhaust leaks with my highly calibrated ears. I'm leaning towards fuel filter/injectors, or MAF. Nothing has been added that could have contaminated the O2 sensors. I'll definately try cleaning out the throttle body and IAC too, as that's the cheapest fix. My mom doesn't drive the truck much, especially in winter. So it'll probably be a spring project to track down the problem.
go to napa, get MAF cleaner (CRC makes it) and clean the maf and crack open a beer and enjoy2009 Honda Civic EX- the daily beater
old toys - 1983 trans am, 1988 trans am, 1986 IROC-Z, 2002 Ram Off-Road, 1984 K10, 1988 Mustang GT, 2006 Silverado 2500HD
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