Question about 2002 Ford Explorer Sport Trac
Also p0300 & p0316, found air filter collapsed a popping noise coming from air intake duct
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get to try the service completely Free afterwhich it costs $6 per call and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
CODE PO171 SYSTEM ADAPTIVE FUEL TOO LEAN BANK 1. CODE PO172 SYSTEM ADAPTIVE FUEL TOO RICH BANK 1. CODE PO174 SYSTEM ADAPTIVE FUEL TOO LEAN BANK 2. CODE PO175 SYSTEM ADAPTIVE FUEL TOO RICH BANK 2. ALL CODES COULD BE CAUSED BY AIR LEAKS AFTER THE MASS AIR FLOW SENSOR OR LEAKS IN THE PVC SYSTEM.EXHAUST LEAKS BEFORE OR NEAR WHERE THE HO2S IS MOUNTED.FUEL INJECTORS RESTRICTED OR NOT GETTING ENOUGH FUEL WEAK FUEL PUMP. LEAKING EGR GASKET OR LEAKING EGR VALVE DIAPHRAM.MASS AIR FLOW SENSOR DIRTY CAUSES PCM TO UNDERESTIMATE AIRFLOW.
Posted on Sep 16, 2009
Testimonial: "Thanks for the . I changed the PVC valve and fuel filter and was able to reset the codes (I couldn't before). So far so good."
P0171------ system too lean bank#1
Po174------ system too lean bank#2
For these 2 codes, try cleaning the maf sensor (mass air flow), that is mounted in the big black hose that goes from the air filter housing to the throttle plate, if it is dirty, that will cause those 02 sensors to send a signal to the computor to lean the air fuel mixture. If cleaning it doesn't work, the sensors will probably need changing.
P0300---- Random/multiple cylinder misfire
P0316---- Cylinder misfire at start up---- first 100 revolutions.
On those 2 codes, you have to do some testing to find out why there is a misfire.
weak coil pack
fowling spark plugs/wires
Low fuel pressure
Posted on May 12, 2010
SOURCE: I HAD 1999 FORD RANGER
This code is for a too rich condition on the drivers side bank of the engine,as I am sure that you are aware. The condition is likely caused by excess fuel getting into the engine on one bank.Usually this will be caused by a faulty fuel pressure regulator.I suggest removing the vacuum line from the regulator to see if there is fuel leaking into the vacuum line.
There is a complete diagnostic procedure for this code.
FORD: 1990-1997 THUNDERBIRD
1990-1999 MUSTANG, TAURUS SHO
1991-1999 CROWN VICTORIA, ESCORT, TAURUS
LINCOLN-MERCURY: 1990-1997 COUGAR
1991-1999 CONTINENTAL, GRAND MARQUIS, SABLE, TOWN CAR, TRACER
1993-1998 MARK VIII
LIGHT TRUCK: 1990 BRONCO II
1994-1997 F SUPER DUTY, F-250 HD
1994-1999 ECONOLINE, F-150, F-250 LD, F-350
1997-1999 EXPEDITION, MOUNTAINEER
1999 F-250 HD, SUPER DUTY F SERIES
This TSB article is a diagnostic procedure to address vehicles that exhibit lean driveability symptoms and may or may not have any Diagnostic Trouble Codes (DTCs) stored in memory.
Follow the diagnostic procedures described in the following Service Tip. The revised diagnostic procedure is a more accurate means of diagnosing the symptoms.
MASS AIR FLOW (MAF) DISCUSSION
MAF sensors can get contaminated from a variety of sources: dirt, oil, silicon, spider webs, potting compound from the sensor itself, etc. When a MAF sensor gets contaminated, it skews the transfer function such that the sensor over-estimates air flow at idle (causes the fuel system to go rich) and under-estimates air flow at high air flows (causes fuel system to go lean). This means Long Term Fuel Trims will learn lean (negative) corrections at idle and learn rich (positive) corrections at higher air flows.
If vehicle is driven at Wide Open Throttle (WOT) or high loads, the fuel system normally goes open loop rich to provide maximum power. If the MAF sensor is contaminated, the fuel system will actually be lean because of under-estimated air flow. During open loop fuel operation, the vehicle applies Long Term Fuel Trim corrections that have been learned during closed loop operation. These corrections are often lean corrections learned at lower air flows. This combination of under-estimated air flow and lean fuel trim corrections can result in spark knock/detonation and lack of power concerns at WOT and high loads.
One of the indicators for diagnosing this condition is barometric pressure. Barometric pressure (BARO) is inferred by the Powertrain Control Module (PCM) software at part throttle and WOT (there is no actual BARO sensor on MAF-equipped vehicles, except for the 3.8L Supercharged engine). At high air flows, a contaminated MAF sensor will under-estimate air flow coming into the engine, hence the PCM infers that the vehicle is operating at a higher altitude. The BARO reading is stored in Keep Alive Memory (KAM) after it is updated. Other indicators are Long Term Fuel Trim and MAF voltage at idle.
NOTE: THE FOLLOWING PROCEDURE MAY ALSO BE USED TO DIAGNOSE VEHICLES THAT DO NOT HAVE FUEL SYSTEM/HO2S SENSOR DTCs.
* Lack of Power
* Spark Knock/Detonation
* Hesitation/Surge on Acceleration
* Malfunction Indicator Lamp (MIL) Illuminated - DTCs P0171, P0172, P0174, P0175 may be stored in memory
* P0171, P0174 (Fuel system lean, Bank 1 or 2)
* P0172, P0175 (Fuel system rich, Bank 1 or 2)
* P1130, P1131, P1132, (HO2S11 lack of switching, Bank 1)
* P1150, P1151, P1152, (HO2S21 lack of switching, Bank 2)
* 181, 189 (Fuel system lean, Bank 1 or 2)
* 179, 188 (Fuel system rich, Bank 1 or 2)
* 171, 172, 173 (HO2S11 lack of switching, Bank 1)
* 175, 176, 177 (HO2S21 lack of switching, Bank 2)
* 184, 185 (MAF higher/lower than expected)
* 186, 187 (Injector pulse width higher/lower than expected)
NOTE: DO NOT DISCONNECT THE BATTERY. IT WILL ERASE KEEP ALIVE MEMORY AND RESET LONG TERM FUEL TRIM AND BARO TO THEIR STARTING/BASE VALUES. THE BARO PARAMETER IDENTIFICATION DISPLAY (PID) IS USED FOR THIS DIAGNOSTIC PROCEDURE. ALL OBDII APPLICATIONS HAVE THIS PID AVAILABLE. THERE ARE SOME OBDI VEHICLES THAT DO NOT HAVE THE BARO PID, FOR THESE VEHICLES OMIT THE BARO CHECK AND REFER ONLY TO STEPS 2, 3, AND 4 IN THE DIAGNOSTIC PROCEDURE.
1. Look at the BARO PID. Refer to the Barometric Pressure Reference Chart in this article. At sea level, BARO should read about 159 Hz (29.91 in. Hg). As a reference, Denver, Colorado at 1524 meters (5000 ft.) altitude should be about 144 Hz (24.88 in. Hg.). Normal learned BARO variability is up to ±6 Hz (±2 in. Hg.). If BARO indicates a higher altitude than you are at (7 or more Hz lower than expected), you may have MAF contamination. If available, Service Bay Diagnostic System (SBDS) has a Manifold Absolute Pressure (MAP) sensor that can be used as a barometric pressure reference. Use "MAP/BARO" test under "Powertrain," "Testers and Meters." Ignore the hookup screen. Connect GP2 to the reference MAP on the following screen.
NOTE: REMEMBER THAT MOST WEATHER SERVICES REPORT A LOCAL BAROMETRIC PRESSURE THAT HAS BEEN CORRECTED TO SEA LEVEL. THE BARO PID, ON THE OTHER HAND, REPORTS THE ACTUAL BAROMETRIC PRESSURE FOR THE ALTITUDE THE VEHICLE IS BEING OPERATED IN. LOCAL WEATHER CONDITIONS (HIGH AND LOW PRESSURE AREAS) WILL CHANGE THE LOCAL BAROMETRIC PRESSURE BY SEVERAL INCHES OF MERCURY (±3 Hz, ±1 in. Hg.).
NOTE: BARO IS UPDATED ONLY WHEN THE VEHICLE IS AT HIGH THROTTLE OPENINGS. THEREFORE, A VEHICLE WHICH IS DRIVEN DOWN FROM A HIGHER ALTITUDE MAY NOT HAVE HAD AN OPPORTUNITY TO UPDATE THE BARO VALUE IN KAM. IF YOU ARE NOT CONFIDENT THAT BARO HAS BEEN UPDATED, PERFORM THREE OR FOUR HEAVY, SUSTAINED ACCELERATIONS AT GREATER THAN HALF-THROTTLE TO ALLOW BARO TO UPDATE.
Posted on Oct 06, 2010
Tips for a great answer:
Mar 11, 2017 | Jeep Cars & Trucks
Feb 02, 2017 | Chrysler Cars & Trucks
Oct 24, 2016 | 2008 Chevrolet Suburban
Mar 18, 2016 | Cars & Trucks
The air duct for being collapsed or restricted
The air filter for being dirty or restricted
Objects blocking the throttle body
Excessive fuel in the crankcase due to leaking fuel injectors--Refer to Fuel Injector Diagnosis .
The evaporative emissions control system for improper operation
Excessive fuel pressure--Refer to Fuel System Diagnosis .
Malfunctioning fuel injectors--Refer to Fuel Injector Diagnosis .
Fuel contamination--Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
Fuel composition--Refer to Fuel Composition Diagnosis RPO LGD, VIN code W, E85 compatible engines only.
The HO2S sensor 1 for improper installation and for electrical wires or connectors that may have contacted the exhaust system
The HO2S sensor 1 signal circuit shorted to voltage
Malfunctioning engine components--Refer to Symptoms - Engine Mechanical .
Mar 03, 2015 | 2008 Chevrolet Uplander
Jan 21, 2013 | 2002 Toyota MR2 Spyder
Dec 24, 2010 | Ford Taurus Cars & Trucks
Jan 23, 2010 | 2001 Pontiac Grand Am SE
Sep 16, 2009 | 1997 Ford F150 Regular Cab
499 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: