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1999 Ford Truck Explorer 2WD 4.0L SOHC 6cyl is detecting rich or lean air fuel ratio what could it be

Detecting rich or lean air fuel ratio what could it be

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  • Anonymous Mar 27, 2014

    fuel air ratio too rich too lean

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  • Ford Expert
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Try spray cleaning your air mass sensor. be careful and use very little spray. you can damage the air mass sensor with too much spray. the air mass senser tells the computer if your air filter needs to be replaced. it is located between the air filter and the air throttle body.

Posted on Dec 04, 2012

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: pcv valve :where is it located on a 1999 ford explorer sport 2wd

It is located at the back of the engine near the fire wall. It is gray with a T connector at the top with two hoses coming off of the T and going forward into the intake manifold.

Posted on Mar 07, 2009

  • 180 Answers

SOURCE: 1998 Ford Truck F 150 2WD Pickup V8-4.6L SOHC VIN

this is not a job for the faint of heart!! you have to remove the complete dash! the heater box is located hehind the radio !in the middle of the dash ! theres no way around!!!

Posted on Mar 20, 2010

  • 73 Answers

SOURCE: Need 2 loc8 PCV on 1999 Exploer 2WD 6CYL SOHC.

The pcv valve is typically located in the valve cover near the brake booster which is on the drivers side

Posted on Apr 04, 2010

  • 14585 Answers

SOURCE: I have a 1998 Ford Explorer, 2wd, 4.0L SOHC 6cyl.

Check for vacuum leaks. this is the main cause for lean codes. Definitely not the coolant sensor. Let me know there are other things also.

Posted on Feb 14, 2011

azcoyoterobb
  • 36 Answers

SOURCE: My 1999 Ford Explorer has the ABS and Engine light lit. When I put on the scanner, detected errors with the following codes: C1230, P0171 and P0174. What problem does my ford explorer?

You will need a book for that...and good luck at finding what you need, the Chilton Books, and others have cut their info. back to maintenance only...for the most part. go to AutoZone, They have a good system, and if you find a friendly Parts Person, they might be able to help you...or you can take it to a known, good, Mechanic...

Posted on Jul 30, 2012

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1 Answer

1998 ford explorer with a rich/lean code


I would check for a vacuum leak somewhere. Like the post for the pcv hoses and elbows to the intake manifold gaskets not sealing. Check with at scan tool the fuel trims to see how the engine is running. If the long term fuel trim is over 10 % then there is a vacuum leak. It is rare for a lean running bank and at the same time a rich running bank. The only thing that could be possible cause for that would be the mass air flow sensor or the hose to the throttle body is not sealing causing unwanted air to get passed the MAF. These engines have a problem when it is cold the manifold gaskets not sealing and then when the engine is warm to seal and the fuel trims be high when cold and then be normal after it warms up

Mar 22, 2014 | 1998 Ford Explorer

1 Answer

Down to the final OB code on my truck...Po174


P0174 FORD - Fuel Injection System Too lean Bank 2xicon.jpghttp://engine-codes.com/p0174_ford.htmlForum CodePossible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection Tech notes The codes is usually set when there is an intake leak after the air flow meter, before replacing any parts check for loose or broken hoses and intake gasket leak. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem.

It's a very common problem for the Ford Windstar. Here a link to a web site with information how to repair:
When is the code detected?- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.) Symptoms- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel ConsumptionP0174 FORD Description The Powertrain Control Module (PCM) monitors the engine Air/Fuel mixture ratio, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The PCM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.

In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the PCM judges the condition as the fuel injection system malfunction and light up the engine light.

Oct 08, 2012 | Cars & Trucks

1 Answer

My 91 explorer wont pass emissions, Co levels too high and hc levels. Are high as well


have your air/fuel (a/f) ratio checked. high CO level means you have a rich a/f mixture.

rich a/f mixture means there is too much fuel compared to air. this is bad for fuel economy.
lean a/f mixture means there is too much air compared to fuel. this needs immediate attention since this might lead to over compression in the combustion chamber, which develops to total internal engine failure.

Aug 06, 2011 | Ford Explorer Cars & Trucks

1 Answer

Turn signal and flasher dont work


For 1999 Ford Truck Explorer 4WD 4.0L EFI SOHC 6cyl check the Flasher; this is located in front seating area, driver side, behind dash, mounted on steering column .

Hope this helps (remember to rate and comment this answer).

Mar 14, 2011 | 1999 Ford Explorer

2 Answers

My truck is showing codes 171 and 174. Can you help


P0174 Generic Definition

Fuel Trim Bank Two Condition
- The ECM has detected a rich or lean air/fuel ratio condition on engine bank two

Probable Cause[s]

  1. If bank one and two are set together suspect a fuel pressure condition or MAF sensor fault
  2. Failed HO2S21
  3. Ignition misfire condition
  4. Fuel injector problem
  5. Engine mechanical condition




    P0171 Generic Definition

    Fuel trim bank one condition
    - The powertrain control module uses the oxygen sensor to calculate the air/fuel ratio of the engine. The computer has recognized a rich or lean condition on one engine bank only.

    Probable Cause[s]

    1. If bank one and two codes set together suspect fuel pressure or MAF (Mass Air Flow) Sensor
    2. Oxygen sensor defective
    3. Ignition misfire-repair
    4. Fuel injector problem












      Mar 05, 2011 | 1999 Chevrolet Silverado 1500

      2 Answers

      I have a 1998 Ford Explorer, 2wd, 4.0L SOHC 6cyl. It won't idle when cold. Once it's warm, it runs fine. Codes coming up is running lean. Could it be my coolant temp sensor?


      Check for vacuum leaks. this is the main cause for lean codes. Definitely not the coolant sensor. Let me know there are other things also.

      Feb 14, 2011 | 1998 Ford Explorer

      2 Answers

      Where is the fuel filter located at on a 1998 ford explorer?


      For 1998 Ford Truck Explorer 4WD 4.0L EFI SOHC 6cyl the Fuel Filter is located under vehicle, driver side, below seating area, near fuel tank, mounted on frame rail in fuel line .

      Hope this helps (remember to rate and commene this answer).

      Jan 27, 2011 | 1998 Ford Explorer

      1 Answer

      I have a code reader and the code is P0171 P0174 System too lean. what makes the system too lean?


      P0171 - Fuel Injection System Too Lean Bank 1
      Possible Causes:
      - Intake air leaks
      - Front Heated oxygen sensor may be faulty
      - Injectors may be faulty
      - Exhaust gas leaks
      - Incorrect fuel pressure
      - Lack of fuel
      - Mass air flow sensor may be faulty
      - Incorrect PCV hose connection

      P0174 - Fuel Injection System Too Lean Bank 2
      Possible Causes:
      - Intake air leaks
      - Front Heated oxygen sensor may be faulty
      - Injectors may be faulty
      - Exhaust gas leaks
      - Incorrect fuel pressure
      - Lack of fuel
      - Mass air flow sensor may be faulty
      - Incorrect PCV hose connection

      What Causes These Codes: Fuel injection system does not operate properly. The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.) The Powertrain Control Module (PCM) monitors the engine Air/Fuel mixture ratio, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The PCM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the PCM judges the condition as the fuel injection system malfunction and light up the engine light. The codes is usually set when there is an intake leak after the air flow meter, before replacing any parts check for loose or broken hoses and intake gasket leak. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem.

      Jan 16, 2011 | 2000 Ford Explorer

      1 Answer

      Need 2 loc8 PCV on 1999 Exploer 2WD 6CYL SOHC.


      The pcv valve is typically located in the valve cover near the brake booster which is on the drivers side

      Jan 20, 2010 | 1999 Ford Explorer

      2 Answers

      Firing order


      that is true your firing order is wrong here is a link to a web sight that has all the 1998 explorers 6cyl just click on the one that your explorer is and it'll show you the correct firing order also make sure you have your plugs gaped right good luck.
      http://autorepair.about.com/library/firing_orders/bl-ford-firing-98.htm

      Mar 22, 2009 | 1998 Ford Explorer

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