Question about 1992 Buick LeSabre

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Buick lesabre nightmare 2

Removed o2 sensor thinking exhaust was restricted ran engine with o2 sensor removed, no change. Disconnected electrical connection at mass air flow sensor. Was able to keep running on cold start but just barely. Once engine would idle on its own. Reconnected mass air flow sensor engine died. Disconnected engine would run although poorly. Have replaced mass air flow sensor. Is it possible iacvalve could be defective? Have replaced iac valve twice.Beleive I have a lean condition because either or starting fluid in snorkle makes eng run normal. Have done propane leak test around upper and lower intake. Noticed strange condition. Temp gauge will fluctuate from left to right when cranking & amp gauge goes from 14 to 8 while cranking. Removed throttle body and all sensorscleaned thourghaly replaced t/body gskt . Scanned computer with snap on brick, no codes. Mass air flow, when running showed 5 at idle block learn & integrater 128. Have found prom update. Prom # 9554. very expensive, could this be my problem?

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  • 3 more comments 
  • Anonymous Mar 14, 2014

    it had a bad coil pack & mass air flow sencer. I replaced both & now it will start & idle then dies.

  • Anonymous Mar 16, 2014

    i haved cleand the throtle body and air mass sencor then my car keeps on looping when i start it up i have evry thing but it keeps on looping

  • montehammons Mar 23, 2014

    It could be a leaking intake manifold gasket.

  • Anonymous Mar 23, 2014

    Mass air flow sensor

  • Anonymous Mar 30, 2014

    location of mass air flow sensor?

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  • Master
  • 321 Answers

  • The PCM doesn't even see the O2 sensor until engine temp has reached operating temp,the vehicle goes from open loop when cold,to closed loop when warm,where the PCM uses the O2 sensor to measure the rich/lean of the exhaust content,and from that,adjust fuel richness to achieve 14.7 to 1 air/fuel ratio.So when cold,the O2 sensor is out of the picture anyways.When unplugging sensors,it can be deceitful.The PCM has a program whereas,if a critical sensor (such as the mass air flow) is somehow damaged and out of the picture,the PCM will substitue a generic value that will allow the engine to stay running.So,by unplugging the MAF,it did try to run on it's own better than plugged in,there's the problem area.The vehicle is running better with the MAF unplugged,because the MAF is likely bad,and the PCM is substituting it's generic value when it IS unplugged.Something to recheckThe PROM update is a newer program for the PCM,and likely won't fix it unless the PCM is bad.I would try a good used PCM as a last or later resort,because i have seen my fair share of defective PCM's too.I have taken some PCM's apart,and found capacitors that had gone bad and leaked all over the circuit board,mostly Honda and Mitsubishi and Chrysler though.Good luck,keep me posted.

Posted on Aug 01, 2008

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1 Answer

How Many Oxygen Sensors On A 2002 Buick Lesabre?


oxygen sensors ( O2S) are located after the cat converter/s
heated oxygen sensors (HO2S) are located in the exhaust manifold/s before the cat converters
so on a 4cyl/in line 6 cyl engine --1 of each
on a v6/v8 --2 of each

Apr 01, 2017 | 2002 Buick LeSabre

1 Answer

Oxygen Sensors are coding, and need to be replaced. Is there somewhere other than Google that can give me an accurate Location of where on this Engine the Upstream, and Downstream are?


The up stream O2 sensor is on the back side of the engine in the exhaust manifold ! The down stream O2 sensor is under the vehicle after the catalytic converter ! What code P0xxx what . Just because it has an O2 sensor code doesn't mean the sensors are bad . Should check wiring , signal wire to PCM an Ground .


Heated Oxygen Sensor Replacement - Sensor 2


Tools Required

J 39194 Oxygen Sensor Wrench



Removal Procedure




  1. Turn OFF the ignition.



  2. Caution: To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and strap the vehicle to the hoist.




  3. Raise and support the vehicle.



Remove the splash shield (3). Disconnect the electrical connector retaining tab (1) from the heated oxygen sensor (HO2S) electrical connector (2). Disconnect the oxygen sensor connector (4) from the HO2S electrical connector (2).




Important: The HO2S may be difficult to remove when engine temperature is below 48?°C (120?°F). Excessive force may damage threads in exhaust manifold or exhaust pipe.



Use the J 39194 in order to remove the oxygen sensor (4) from the exhaust pipe .



Heated Oxygen Sensor Replacement - Sensor 1




Notice: The Heated Oxygen Sensor (HO2S) and the Oxygen Sensor use a permanently attached pigtail and connector. Do not remove this pigtail from the Heated Oxygen Sensor. Damage or the removal of the pigtail or the connector could affect the proper operation of the sensor.



Take care when handling the HO2S and the O2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Also avoid using cleaning solvents of any type. Do not drop the HO2S or the O2S. Do not roughly handle the HO2S or the O2S.




Removal Procedure




  1. Remove the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical .


  2. Turn OFF the ignition switch.


  3. Remove the HO2S retaining clip from the bracket.


  4. Disconnect the HO2S electrical connector tab from the HO2S 1 retaining clip .


  5. Remove the HO2S electrical connector retainer.


  6. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

Sep 21, 2015 | 2001 Buick LeSabre

1 Answer

How to change upstream o2 sensor on 2008 chevy uplander 3.9l ?


  • 1 Warm up the engine for about four minutes to bring it to operating temperature. Then turn off the engine. This will avoid damage to the exhaust pipe threads if that sensor has seized to the pipe.
  • 2 Find the oxygen sensor or sensors you need to replace. The upstream sensor is located near the exhaust manifold and the downstream sensor on the back exhaust pipe, close to the catalytic converter.
  • 3 Disconnect the oxygen sensor electrical connector. Depending on your particular Chevy model, both sensors may be disconnected from the engine compartment.
  • 4 Lift the front of your Chevy model to reach the sensor you need to change, if necessary. Use a floor jack and two jack stands to support it.
  • 5 Remove the oxygen sensor using a box-end wrench or a ratchet and oxygen-sensor socket.


  • Read more : http://www.ehow.com/how_5159092_replace-oxygen-sensor-chevy.html

    Jul 23, 2014 | Chevrolet Chevy Cars & Trucks

    2 Answers

    Where is bank 1 sensor 1 O2 sensor loc. in 2006 buick lucerne 3.8l V6


    bank 1 is closest to the firewall
    o2 sensor 1 is after the cat converter for that side exhaust system

    Mar 27, 2012 | 2000 Buick LeSabre

    1 Answer

    My 2000 Buick LeSabre was recently serviced and they replaced the MAF sensor. 3 days later It ran rough after starting. It smoothed out after that. Not wanting to spend another $400.00 I bought a...


    I would say no its not normal may need to change O2 sensor or the cat. showing the missfire could be from the O2 sensor. ez test if it happends agian is unpulg the O2 and see if the idile changes if it dosent replace O2 sensor.

    Jul 05, 2011 | Buick LeSabre Cars & Trucks

    3 Answers

    Where is the O2 sensor located


    For 2000 Buick Lesabre 3.8L SFI OHV 6cyl the Oxygen Sensor is located: under hood, center, rear engine area, above exhaust pipe flange, mounted in exhaust manifold.

    zjlimited_1375.jpg

    Fig. HO2S1 location "2" on 3.8L


    zjlimited_1376.jpg



    Fig. HO2S2 location "4" on 3.8L




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

    Jun 07, 2011 | 2000 Buick LeSabre

    2 Answers

    How to change o2 sensors in a 1993 buick lesabre


    The o2 sensor is in the rear exhaust manifold.You should be able to see it from under the hood.It takes a 7/8 special socket.You can find you at any parts store.You might want to soak it with penetrant.P.B.blaster works real good.Try not to cross thread it.There is only one o2 sensor on your vehicle.Hope this helps.Good luck.

    Mar 20, 2010 | 1993 Buick LeSabre

    1 Answer

    How to change oxygen sensors in 92 buick lesabre


    The O2 sensors are located on the exhaust system piping. Either on the manifolds or on the pipes themselves. You will need the vehicle cool, then disconnect the electrical connectors. Do them one at a time. You will need either a special O2 sensor socket or a 17 - 22 mm wrench to remove them. Unscrew them from the pipe and rescrew the new one back in. Then reattach the connectors. Then you can start the car.

    Sep 26, 2009 | 1992 Buick LeSabre

    1 Answer

    92 Buick Le Sabre engine stumbling/hesitation


    Have you checked fuel pressure? How about spark on all 6 cylinders? Maybe a coil?

    Apr 12, 2009 | 1992 Buick LeSabre

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