Question about Buick LeSabre

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Low mpg 12 mpg on my car was getting 26-30 no error codes new parts all filters pcv valve, plugs, oxygen sensor, wires i have a autoxray 3000 scanner only thing that looks bad is knock sensor shows knocking am thinking reset computer to let it place factory specs back in

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YOu could try the computer reset. it may help. Other things you can try are running a higher octane gasoline, or the next time you fill up get a container of fuel injector cleaner, or fuel system cleaner. This will help to get rid any deposits that are built up in the engine

Posted on Apr 24, 2009

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Have p0171 code


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 cracked vacuum or PCV line/connection Faulty or stuck open PCV valve Failed or faulty oxygen sensor (bank 1, sensor 1) Sticking/plugged or failed fuel injector Low fuel pressure (possible plugged/dirty fuel filter!) Exhaust leak between engine and first oxygen sensor

Mar 27, 2015 | 2001 Ford Explorer Sport Trac

1 Answer

1998Pontiac Bonneville check engine light is on Code p0171 how can I fix this


  • Bank 1 Oxygen sensor fault: Possible causes:
  • 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 cracked vacuum or PCV line/connection
  • Faulty or stuck open PCV valve
  • Failed or faulty oxygen sensor (bank 1, sensor 1)
  • Sticking/plugged or failed fuel injector
  • Low fuel pressure (possible plugged/dirty fuel filter!)
  • Exhaust leak between engine and first oxygen sensor
  • Solutions:


  • Solutions:


    S

    Jul 20, 2014 | Cars & Trucks

    1 Answer

    P0171 code


    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 cracked vacuum or PCV line/connection

    Faulty or stuck open PCV valve Failed or faulty oxygen sensor (bank 1, sensor 1)

    Sticking/plugged or failed fuel injector Low fuel pressure (possible plugged/dirty fuel filter!)

    Exhaust leak between engine and first oxygen sensor

    Apr 19, 2014 | 2000 Toyota Tacoma PreRunner

    2 Answers

    The car will idle low on and off and the idle is a little rough. I have a new pcv valve, new air filter, new spark plugs and wires, new timing belt.


    The first thing I would look at is the EGR as they could make your car run rough Located just under the throttle body

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    Oct 15, 2011 | 2003 Dodge Neon

    1 Answer

    Trouble shoot low fuel economy


    try any of the following::::new spark plugs, fuel injecter clean(if it has any), using cruise control on long flat roads,new fuel filter, new after market air filter, pcv valve helps a little.. very easy to change to.......thats all i can think of..

    Jul 20, 2010 | 1994 Ford Escort

    1 Answer

    MPG has dropped


    Air filter? And any car I have ever owned with a timing belt has shown a noticeable drop-off in MPG when the belt had some miles on it. I would do what you have done but added (or at least eyeballed) the air filter. If that didn't bring it back, the timing belt was next since it doesn't take hardly any stretching to throw off the valve timing and it is critical to performance and MPG.

    Dec 18, 2009 | 1996 Dodge Dakota

    1 Answer

    My mpg's are way down I am only getting about 105 miles per full tank of gas. I put new spark plugs in and a new 02 and still mpg's are way down what do I do next?


    Try a major tune up (spark plugs are only one part of it) fuel/air filter, PCV valve, cap, rotor, spark plug wires and adjust timing..

    Dec 10, 2009 | 1993 GMC Jimmy

    2 Answers

    NOT GETTING GOOD GAS MILEAGE


    here are a couple of different problems that will cause bad fuel mileage. first is air filter, still getting low mpg. then the pcv valve. clean fuel system. the cost of filter about $20 pcv was $12 and the fuel system cleaning and pcv is easy to do. when cleaning the fuel system,clean the injectors the fuel rail and the throttle body be sure that you have them change the oil or that you do it after they work on it. Notice whether the oil smelled like fuel then your engine needs platinum plugs for best spark they can run as much as $8 each.

    Jul 31, 2009 | 2003 Pontiac Grand Prix

    1 Answer

    New plugs ,wires,pcv valve and injectors cleaned from dealer now i'm getting less than 10 mpg any suggestions


    have oxygen sensor checked. air filter? tire pressure, wheel alignment. have brakes checked if it is not pulling or dragging.

    Jul 11, 2009 | 2004 Dodge Ram 2500

    1 Answer

    More fuel consumpion


    No codes? Checklist: MAF: Mass Air Flow Sensor, MAP: Manifold Absolute Pressure Sensor, Engine Valves/Low cylinder compression, Fuel Injectors, Fuel Pressure, Tire pressure, vacuum leak(s), PCV: Polution Control Valve, Purge Control Solenoid Valve PCSV stuck open/leaking, Intake Air Hose leaking, Engine Coolant Temperature Sensor, Intake Air Temperature Sensor, etc. etc. etc..
    Go to http://www.hmaservice.com/ and register (vehicle by VIN). Afterward, you'll have access to technical information (manuals, wiring diagrams, service bulletins, etc) about your vehicle.

    Apr 01, 2009 | 2001 Hyundai XG300

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