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Old 05-24-2008, 21:35   #1 (permalink)
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97 mercury sable acting up

I have a 1997 mercury sable with a 3.0 OHV. I recently did a head job on it because of leaking antifreeze in cylinders 2 and 3. Ive done everything according to specs and now it sounds like it got a dead hole in it. Ive hooked up the scanner it and it gave me a P0171 code which was 02 showing lean on bank 1. Friend told me its probably and o2 sensor. Bank one I believe is the side the number 1 cyinder is on. So i changed it. So I did another KOER test on it and now a P1138 code is showing up it says O2sensor is rich. and also a P1157 code shows up also. I tells me to fix the first code first. Can somebody tell me what I should do next or what these codes could possibly mean or what am i doing wrong?
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Old 05-25-2008, 18:08   #2 (permalink)
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Exclamation Re: 97 Mercury Sable acting up

You may want to look at the MAF sensor for being dirty for the lean code. Read this:

Article No.
98-23-10

11/23/98

MASS AIR FLOW (MAF) - SENSOR
CONTAMINATION - SERVICE TIP

FORD:
1990-97 THUNDERBIRD
1990-99 MUSTANG, TAURUS SHO
1991-99 CROWN VICTORIA, ESCORT, TAURUS
1992-94 TEMPO
1993-97 PROBE
1995-99 CONTOUR

LINCOLN-MERCURY:
1990-97 COUGAR
1991-99 CONTINENTAL, GRAND MARQUIS, SABLE, TOWN CAR, TRACER
1992-94 TOPAZ
1993-98 MARK VIII
1995-99 MYSTIQUE

LIGHT TRUCK:
1990 BRONCO II
1990-97 AEROSTAR
1990-99 RANGER
1991-99 EXPLORER
1994-96 BRONCO
1994-97 F SUPER DUTY, F-250 HD
1994-99 ECONOLINE, F-150, F-250 LD, F-350
1995-99 WINDSTAR
1997-99 EXPEDITION, MOUNTAINEER
1998-99 NAVIGATOR
1999 F-250 HD, SUPER DUTY F SERIES

ISSUE
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.

ACTION
Follow the diagnostic procedures described in the following Service Tip. The revised diagnostic procedure is a more accurate means of diagnosing the symptoms.

SERVICE TIP

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.

Symptoms

^ Lack of Power

^ Spark Knock/Detonation

^ Buck/Jerk

^ Hesitation/Surge on Acceleration

^ Malfunction Indicator Lamp (MIL) Illuminated -

DTCs P0171, P0172, P0174, P0175 may be stored in memory


OBDII DTCs

^ 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)


OBDI DTCs

^ 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 not 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.

2. On a fully warmed up engine, look at Long Term Fuel Trim at idle, in Neutral, A/C off, (LONGFT1 and/or LONGFT2 PIDs). If it is more negative than -12%, the fuel system has learned lean corrections which may be due to the MAF sensor over-estimating air flow at idle. Note that both Banks 1 and 2 will exhibit negative corrections for 2-bank system. If only one bank of a 2-bank system has negative corrections, the MAF sensor is probably not contaminated.

3. On a fully warmed up engine, look at MAF voltage at idle, in Neutral, A/C off (MAF V PID). If it's 30% greater than the nominal MAF V voltage listed in the Powertrain Control/Emissions Diagnosis (PC/ED) Diagnostic Value Reference Charts for your vehicle, or greater than 1.1 volts as a rough guide, the MAF sensor is over-estimating air flow at idle.

4. If at least tow of the previous three steps are true, proceed to disconnect the MAF sensor connector. This puts the vehicle into Failure Mode and Effects Management (FMEM). In FMEM mode, air flow is inferred by using rpm and throttle position instead of reading the MAF sensor. (In addition, the BARO value is reset to a base/unlearned value.) If the lean driveability symptoms go away, the MAF sensor is probably contaminated and should be replaced. If the lean driveability symptoms do not go away, go to the PC/ED Service Manual for the appropriate diagnostics.

NOTE DUE TO INCREASINGLY STRINGENT EMISSION/OBDII REQUIREMENTS, IT IS POSSIBLE FOR SOME VEHICLES WITH MAF SENSOR CONTAMINATION TO SET FUEL SYSTEM DTCs AND ILLUMINATE THE MIL WITH NO DRIVEABILITY CONCERNS. DISCONNECTING THE MAF ON THESE VEHICLES WILL, THEREFORE, PRODUCE NO IMPROVEMENTS IN DRIVEABILITY. IN THESE CASES, IF THE BARO, LONGFT1, LONGFT2, AND MAF V PIDs INDICATE THAT THE MAF IS CONTAMINATED, PROCEED TO REPLACE THE MAF SENSOR.

After replacing the MAF sensor, disconnect the vehicle battery (5 minutes, minimum to reset KAM, or on newer vehicles, use the "KAM Reset" feature on the New Generation Star (NGS) Tester and verify that the lean driveability symptoms are gone.

SEE NEXT REPLY FOR YOUR OTHER CODES!!!
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Old 05-25-2008, 18:27   #3 (permalink)
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Exclamation Re: 97 mercury sable acting up

P1138 and P1157 both deal with the downstream (after catalytic converter) O2 sensors.
P1138 indicates the Bank 1 downstream O2 sensor is not switching and is always rich.
P1157 indicates the Bank 2 downstream O2 sensor is not switching and is always lean. For both, possible causes are the following:
-Pinched, shorted, or corroded wiring or pins.
-Crossed sensor wires
-Exhaust leaks
-Contaminated or damaged sensor
Exhaust leaks can affect downstream O2 sensor readings. An exhaust leak within up to 2 feet away can affect the downstream O2 sensors and set various codes. Where you just did a head job, the sensor may have been contaminated from the coolant.
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Old 01-10-2012, 09:34   #4 (permalink)
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Re: 97 mercury sable acting up

Quote:
Originally Posted by tbird100636 View Post
P1138 and P1157 both deal with the downstream (after catalytic converter) O2 sensors.
P1138 indicates the Bank 1 downstream O2 sensor is not switching and is always rich.
P1157 indicates the Bank 2 downstream O2 sensor is not switching and is always lean. For both, possible causes are the following:
-Pinched, shorted, or corroded wiring or pins.
-Crossed sensor wires
-Exhaust leaks
-Contaminated or damaged sensor
Exhaust leaks can affect downstream O2 sensor readings. An exhaust leak within up to 2 feet away can affect the downstream O2 sensors and set various codes. Where you just did a head job, the sensor may have been contaminated from the coolant.
Thank you for this. Our 2001 Windstar has the p1157 code and when I was under there the other day, it sounded like there was an exhaust leak near the cat, but I sure didn't see any soot. I guess it could be under the rattle shield.. Er, I mean heat shield.

Now I wonder if the boss will want me to spend some time chasing this.
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