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Buick engine repair questions and answers

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  • AutoMD Member
    AutoMD Member - 2006 Buick Rendezvous - Engine - 4/2/2014
    Engine has intermittent bucking between 40 to 60 MPH
    Bucking can happen any time but most pronounced between 40 to 60 MPH (1400 to 1900 RPM) mostly if I'm going up a hill but also with no hills, it has even happened when stopped for a light (this is very very seldom). This happens so fast and for such a short ...
     
    0 answer
  • GT n ok
    GT n ok - 1999 Buick Riviera - Engine - 3/31/2014
    Fuel pump getting louder
    supercharged .pump has always been quiet
     
    • Pepe
      3/31/2014 Pepe
      Is your car acting up? Do you mean while running or just start up? need more info...
    • HouseCallAuto
      3/31/2014 HouseCallAuto
      Noise coming from the supercharger indicates that the unit needs to be replaced before the engine ingests metal parts of the unit should it completely fail. I will assume that you have narrowed the noise down and are certain that it is indeed the supercharger that the nopise is originating from and not something below it like a water pump or other pulley bearing?
  • AutoMD Member
    AutoMD Member - 2002 Buick Park Avenue - Engine - 3/30/2014
    Looking for belt pulley diagram for 2002 buick park avenue
    I need to replace belt
  • AutoMD Member
    AutoMD Member - 2002 Buick Park Avenue - Engine - 3/30/2014
    Looking for belt pulley diagram for 2002 buick park avenue
    I need to replace belt
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2006 Buick LaCrosse - Engine - 3/26/2014
    What can cause poor fuel economy after car has had a tune up
    Tuned up car by replacing plugs wires and air filter as well as oil change a few ago. Engine light is on continuously and car is getting very poor fuel economy. Estimated miles per gallon at this point is about 13mpg
     
    • HouseCallAuto
      3/26/2014 HouseCallAuto
      Your problem can only be resolved after plugging in a code reader and reading what fault codes are stored. The check engine light cannot just remain un-diagnosed, and while the light is illuminated and / or codes are stored, of course there will be complaints in driveability and / or gas mileage. The shop that did the tune-up should be able to handle this and if they cannot then you need a new shop, or maybe they do not know about the check engine light?
  • AutoMD Member
    AutoMD Member - 2005 Buick LaCrosse - Engine - 3/22/2014
    It tells me to come to a complete stop turn A/C off....as well as the oil pressure is low and it be make making noise
    When I turned the wheel. I need to know what's the problem.
     
    • Jimm
      3/22/2014 Jimm
      Need more information - what exactly is the issue? Can you please post a rely with specific details? The descrpition provided does not make too much sense as written.
  • AutoMD Member
    AutoMD Member - 2005 Buick LaCrosse - Engine - 3/21/2014
    It tells me to come to a complete stop turn A/C off....as well as the oil pressure is low and it be make making noise
    When I turned the wheel. I need to know what's the problem.
     
    • HouseCallAuto
      3/21/2014 HouseCallAuto
      I cannot follow this, please expand the details and make them more clear. Should I assume that you mean the driver information center messages? Tell me what you are hearing from the engine in detail. What do you mean when you turned the wheel?
  • AutoMD Member
    AutoMD Member - 2005 Buick LaCrosse - Engine - 3/21/2014
    It tells me to come to a complete stop turn A/C off....as well as the oil pressure is low and it be make making noise
    When I turned the wheel. I need to know what's the problem.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1997 Buick Park Avenue - Engine - 3/20/2014
    Why when car is not moving oil pressure is down to 8 but when moving it goes way up and oil light dings when warm
    The oil light will ding when warm and the first stop is made. Oil pressure is down to 8 when sitting still but when the car moves it goes way up. The oil light only dings when the car is warm and it is in a stopped position.
     
    • Jimm
      3/20/2014 Jimm
      First question - is the engine oil level correct? If the oil level is too low - this may cause the low pressure warning.
      If the engine oil level is OK - within the fill range indicated on the dipstick, and the oil viscosity is correct (5w20, 5w30, etc) per recommendation in the owners manual - then the problem may be related these issues; faulty oil pressure switch or sensor, faulty / worn engine oil pump, faulty / worn engine main or rod bearings (excess clearance) due to normal wear and mileage for the engine and vehicle.

      The parts are readily available from these many on-line sources, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com - to list only a few possibilities.
      In fact, they (RockAuto) list the engine oil pressure switch / sending unit from around $26.70 for your vehicle.
      The pressure sending unit is located near the engine oil filter - usually threaded into the engine block - and is easily replaced. Reference these websites for the specific steps; www.AutoMD.com or www.autozone.com.
  • AutoMD Member
    AutoMD Member - 1990 Buick Century - Engine - 3/17/2014
    This car runs good cold, but when warms up has a bad hesitation, missfire, and acts like out of time.
    have checked timing chain, fuel pressure and ignition system
     
    • Jimm
      3/17/2014 Jimm
      First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance. There may be a fault code stored in the OBD memory which may not be displayed as a check engine light.

      Possible Causes of Engine Hesitation or Stumble:

      Dirty fuel injectors (cleaning the injectors often fixes this)
      Dirty air filter (change filter)
      Dirty / clogged fuel filter (change filter)
      Bad MAP (manifold absolute pressure) sensor
      Bad TPS (throttle position) sensor
      Bad or dirty MAF (mass airflow) sensor
      Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
      Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
      Bad gasoline (fuel contaminated with water or too much alcohol)

      Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

      Dirty or worn spark plugs
      Bad plug wires
      Weak ignition coil
      Wet plug wires
    • HouseCallAuto
      3/17/2014 HouseCallAuto
      1. Run the engine to operating temperature. Disconnect the fuel injectors.

      2. Using an ohmmeter, check the resistance of each of the injectors. At operating temperature, the injectors should have a resistance value of 12.4 or greater. All resistance values need to be within 0.2 ohms of the highest recorded value.
  • AutoMD Member
    AutoMD Member - 1994 Buick Park Avenue - Engine - 3/11/2014
    No crank / no start put in new battery stll not working!
    the car has about 163, miles on it , the problem started about 7 months ago i could start it up go to the store comeout 20 mins later it would not start! if i jumpstart it would start, if i didn't i would have to wait an hour before it could start ! i finely ...
     
    • HouseCallAuto
      3/10/2014 HouseCallAuto
      Ignition switches do not fail often on 94 Park Ave. Question: When it does not start, do you still see all the dash warning lights illuminate like usual when the key is turned to "on"? Or, is the dashboard dark as though someone had the battery disconnected? It could be the starter but I would be pissed that they called it a ignition switch and billed you for that. That is not a good shop. The ignition switch did not solve the problem so why pay for that. I would tell them you are gonna sue them small claims and then go to a different shop.
    • AutoMD Member
      3/11/2014 AutoMD Member
      thankyou for answering my questions!!! i appreciate your utmost honesty!!! and yes i am pissed because i told them that ( the starter is bad ) before the manager asked!!! it was share greed ,if he didn't ask for more money he would have gonna away with it!!! and yes the dashboard light do come on!! when i try to start the car !! you have my deepest gratitude thank you again!! i will go there tue 11 of march !
    • HouseCallAuto
      3/11/2014 HouseCallAuto
      Another question I did not ask. There is a security light that is supposed to illuminate at key on for a few seconds and then go out. Do you see that happen or do you see the security light stay illuminated? Because if the light remains on when it does not start then the cause would be a bad ignition lock cylinder which is "near" the igniition switch and I am wondering is this is what they replaced? By the way, there is a conclusive test to be certain that the starter is no good BEFORE actually replacing the starter.
  • Karin
    Karin - 2003 Buick Rendezvous - Engine - 3/10/2014
    I have a very slow oil leaf & can not determine where it is coming from. I have a 2003 Rendezvous.
    Dealership said it was the manifold. I had a new one put in & still have the leak. Need help.
     
    • HouseCallAuto
      3/10/2014 HouseCallAuto
      The 3.4 and the 3.1 both have intermediate shafts under the throttle body and the intermediate shaft has an o-ring that gets hard and brittle and no longer seals the oil from coming out. That is likely where you are leaking oil. Getting the intermediate shaft out requires removing the throttle body for access.
  • AutoMD Member
    AutoMD Member - 1993 Buick Century - Engine - 3/10/2014
    When the car runs for maybe 15 or 20mins it will run rough and stalls then very hard to restart
    The first 15 mins car runs fine I have replaced fuel pump and fuel filter
     
    • Jimm
      3/10/2014 Jimm
      First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance. There may be a fault code stored in the OBD memory which may not be displayed as a check engine light.

      Possible Causes of Engine Hesitation or Stumble:

      Dirty fuel injectors (cleaning the injectors often fixes this)
      Dirty air filter (change filter)
      Dirty / clogged fuel filter (change filter)
      Bad MAP (manifold absolute pressure) sensor
      Bad TPS (throttle position) sensor
      Bad or dirty MAF (mass airflow) sensor
      Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
      Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
      Bad gasoline (fuel contaminated with water or too much alcohol)

      Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

      Dirty or worn spark plugs
      Bad plug wires
      Weak ignition coil
      Wet plug wires
  • Paul
    Paul - 1994 Buick LeSabre - Engine - 3/10/2014
    My car won't start, symptoms listed in additional details. Is the problem likely a starter, battery or solenoid?
    My 1994 Buick LeSabre continually makes fairly rapid clicking sounds when I try to start it but I don't hear the engine turn after a split second and the car doesn't start. I cleaned the battery and cable terminals and correctly ran jumper cables to the battery ...
     
    • Jimm
      3/10/2014 Jimm
      Sounds like a weak battery - but before replacing the battery, remove it and take to the nearest auto parts store to have the battery fully recharged and tested for free.

      There may be other issues; alternator, serpentine drive belt worn or belt tensioner worn.

      Once the battery is fully charged and reinstalled - take the vehicle to the nearest auto parts store for a complete charging system test - for free - to test the condition of the; alternator, battery, belt, wiring, starter, etc. Post a reply with the results for further assistance.
      Jimm
      3/10/2014 Paul
      It turned out the old battery was shot. The new battery did the trick, it started right up. Thanks for the help. I will, however, have the charging system tested just to make sure. Thank you!
  • AutoMD Member
    AutoMD Member - 1991 Buick Century - Engine - 3/7/2014
    Hard Start Cold No Fuel Pressure
    Car only has 29k just purchased...Had all new injectors and fuelpump replaced. When sitting for several hours it has no fuel pressure until cranking for extended period then runs rough for a while
     
    • Jimm
      3/7/2014 Jimm
      Replace the fuel injection pressure regulator - this device maintains a certain fuel pressure and evens out the pulsations of the fuel injectors. You also need to test the fuel pressure at the fuel rail - the fuel rail is simply a tube to distribute fuel to each injector at each cylinder.

      The parts are readily available from these many on-line sources, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com - to list only a few possibilities.
      In fact, they (RockAuto) list the fuel injection pressure regulator from around $37.00 for your vehicle.