Question about 1994 Ford Taurus

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I have a 1994 3.0 L tarus and i have replaced the fuel pump and the maf sensor and it still doesnt run but when i take the intake hose off and choke the intake the car will run fine then i will put the hose back on and it will eventually choke out again and i have no clue what is going on

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Check the fuelpreasure make sure you are gettin g enough fuel, next is check the idle air control valve, it sounds like its getting to much air and not enough fuel if you block off intake you air restricting the air, also the map sensor check that also.

Posted on Aug 29, 2010

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1 Answer

PO174 AND PO171\


code p 0171 refers to system too lean bank1===causes ---intake /exhaust leaks--AIR system---MAF/VAF sensors --fuel pressure/pump--injector/S=== HO2S
code p 0174 refers to system too lean bank 2====causes intake /exhaust leak---fuel pressure/pump---injector/s---AIR system---hose connection/s
the fuel pressure is adequate
The HO2S is the heated oxygen sensor in the exhaust manifold /pipe before the cat converter
( is responsible for the fuel ratio settings )
you may have to pull the injectors to have them cleaned and tested
the maf/vaf sensor may have to be replaced as well

Apr 11, 2017 | 2004 Cadillac SRX

1 Answer

Type p0171


It is a generic OBD2 power train Code. The same solution could be applied to all other vehicles as well.
Error Code: P0171
Description:
Fuel Trim (FT), System too Lean, Bank 1
Possible Causes:
- Fuel pump pressure too high or regulating valve stuck closed.
- Intake/ exhaust leak.
- Secondary air injection (AIR) system.
- Manifold absolute pressure (MAP) sensor.
- Mass air flow (MAF) sensor.
- Fuel pressure/pump.
- Fuel Injector(s).
- Evaporative emission (EVAP) canister purge valve.
- Heated oxygen sensor (HO2S).
Solutions:
-Usually, simply cleaning the Mass air flow (MAF) sensor helps solve the problem.
- It is best to take MAF off and spray it with electronics cleaner or high flash point solvent.
- Inspect all vacuum and PCV hoses, replace if necessary.
- Check for a dirty fuel filter and proper fuel pressure.

Sep 26, 2013 | 2000 Toyota Corolla

1 Answer

93 chevrolet fuel pump symptoms


fuel, timing and ignition can all be factors plus engine sensors once fuel pump is installed and pressure is correct. ck intake temp sensors they run cold start and choke air intake temp sensor.throttle position sensor.before replacing ecm.

Aug 05, 2012 | Cars & Trucks

1 Answer

Engine Cold Starting Problem


the first test is to have the fault codes read rather than replace everything to find the problem
electronic cars have an electronic choke that is worked by the ECM getting reports from the ambient temperature sensor and the baro ( barometric pressure sensor) so as to know what fuel setting to apply when starting
without those reports the ECM assumes that the car is hot and so does not enrich the fuel setting for cold weather starting

Apr 15, 2017 | Buick LeSabre Cars & Trucks

1 Answer

Have a 2005 Ford Taurus and am getting a 171 falut code Aready replace the MAF flow sensor


this is a 2005 tarus with a code of po171, this code is not a mass air flow sensor code this code is defined as bank 1 system lean, ive run into this many times, this may be caused by a weak fuelpump or a vacuum leak, the most common problem i've found was a vacuum leak, check the pcv system and around intake for split hoses. hope this helps,

Oct 27, 2010 | 2005 Ford Taurus

1 Answer

What is code P0171?


P0171

A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires

Jul 14, 2010 | 2002 Kia Sportage

1 Answer

99 CHEVY trouble shoot code P0171


LEAN TROUBLE CODES (P0171 or P0174) A code P0171 or P0174 indicate the engine is running lean. This means there is too much air and/or not enough fuel. You can confirm the engine is running lean by looking at Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT). Normally, STFT and LTFT should be plus or minus 8 from zero. If STFT and/or LTFT are more than about +10 or higher, it indicates the engine is running LEAN. Negative numbers (-10 or more) indicates the engine is running RICH. A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)

______________________________-- Causes A code P0171 may mean that one or more of the following has happened:
  • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
  • There could be a vacuum leak downstream of the MAF sensor.
Possible Solutions Possible solutions include:
  • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure

Jan 02, 2010 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

94 ford Tarus ,,had fuel problem,,replaced fuel pump,,and fuel pump relay moduale,,and checked all fuses...Still no fuel pressure in manifold ..Car will start and run if gas is put in Air intake..Could it...


Fuel shut off switch should be located in the trunk on the same side you fill your tank on. The switch is guarder and you will have to figure out which way to press it

Oct 28, 2009 | 1994 Ford Taurus

2 Answers

Fuel system 1998 Explorer


replace the fuel filter and if that doesnt help replace the fuelpressure regulator !!!
then the fuel pump!!

Apr 21, 2009 | 1999 Ford Explorer

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