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Buick engine repair questions and answers

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  • AutoMD Member
    AutoMD Member - 1997 Buick Park Avenue - Engine - 1/16/2014
    What does the fuel pump relay do?
    Everyone says I need a new fuel pump,but one day it was running fine then next time I went to start it it wouldn't start?
    • HouseCallAuto
      1/16/2014 HouseCallAuto
      There is insufficient information here to decide if the cause is even fuel related. Could be a crank sensor, a mass air flow sensor, an ignition control module, a fuel pump relay or a fuel pump. the least likely of any of these things is a fuel pump relay. The relay is ruled out easy enough, just replace it yourself in 2 minutes with no tools. Its inside the underhood fuse / relay panel. Plug in a code reader and see if any fault codes are stored. You can obtain a code reader from for $20. Reading codes takes 2 minutes with no experience needed.
      3/19/2014 AutoMD Member
      thanks for the advice. It was the fuel pump.
  • AutoMD Member
    AutoMD Member - 1997 Buick Park Avenue - Engine - 1/16/2014
    What does the fuel pump relay do?
    everyone says I need a fuel pump.It was fine then the next time I went to start it it would not start??
    • John's Auto Repair
      1/16/2014 John's Auto Repair
      That's pretty much the way they fail. The fuel pump relay is activated by the engine computer. It
      sends 12 volts to the fuel pump. Relays can fail but if you checked for voltage at the fuel pump
      connector near the fuel tank for several seconds when turning key to run. Than the relay would be working.
  • AutoMD Member
    AutoMD Member - 1999 Buick Century - Engine - 1/16/2014
    Rigging an igintion switch to bypass VATS ignition switch
    Hello. I only have one VATS ignition key for my car and I don't want to pay what a dealer wants for a copy of this key. It's ridiculous. Would a rigged, push-button switch wired directly from the starter work or would the VATS technology in this car still prevent it ...
    • HouseCallAuto
      1/16/2014 HouseCallAuto
      I can start typing here for 15 minutes and explain how, but I don't have to. Just Google "Pass Key bypass" and by the way the anti-theft in your 99 Buick is referred to as Pass-Key II and the letters VATS refer to Ford vehicles for the Vehicle Anti Theft System.

      the bypass can be done for next to no money on your own.
      1/16/2014 HouseCallAuto
      By the way the starter bypass will not work.
  • guy
    guy - 1994 Buick LeSabre - Engine - 1/14/2014
    Installing a remanufactured ecm, now does a 1994 model have to be flashed or is everything transfered
    when i put the old chip into the new ecm, can't seem to get a straight answer , thanks
    • HouseCallAuto
      1/14/2014 HouseCallAuto
      No programming needed. Plug and play. Just transfer PROM. Those were the good ole days. By the way...Final answer.
      1/14/2014 guy
      thank you very much,am installing it today
  • AutoMD Member
    AutoMD Member - 2002 Buick Park Avenue - Engine - 1/14/2014
    , when going up hill the car hesitates, knocks
    power steering hose loose, motor moves way too much, wondering if motor mount is the problem or if it is the tranny
    • Jimm
      1/14/2014 Jimm
      Most likely the engine mount is loose / worn. The engine mounts are always replaced in sets - usually all mounts at the same time due to mileage / age / wear considerations.

      The parts are readily available from these many on-line sources,,,,, - to list only a few possibilities. In fact, they (RockAuto) list the engine mounts from around $31.00 and $56.00 each (front left and front right sides) for your vehicle. The motor mounts are easily replaced - use the 'How-To-Guides' feature on the AutoMD website for the specific steps.
  • AutoMD Member
    AutoMD Member - 1990 Buick Regal - Engine - 1/13/2014
    What causes my car to stall out at red lights?
    My battery voltage is high and my car runs hot, but it also bucks and my RPMs to high when the car acts up. What can be causing my car to be sluggish and stall out often?
    • HouseCallAuto
      1/13/2014 HouseCallAuto
      Check the fuel injectors for resistance. Don't take my word for it, just google "how to check GM multec injector resistance". major problems with GM injectors from '87 to '93 mostly on the V6 engines. Do not skip over checking the resistances as directed. Most mechanics even skip this and they end up replacing every freakin component on the engine and still can't solve it. Overall bad injectors (even just one) causes the car generally to run best when started cold but as the engine warms up (within minutes) performance degrades very noticeably.. The computer sees this increased resistance and begins to shut down the injector drivers, but this action is intermittent. Might not be your cause here but at least rule it out.
  • Ed
    Ed - 2007 Buick Rainier - Engine - 1/10/2014
    Engine starting to use oil. What are the possible causes ?
    Using oil excessively. How to fix and estimated cost?
    • HouseCallAuto
      1/10/2014 HouseCallAuto
      Impossible to decide the cause without monitoring specifics.
      If it has an external oil leak, how to quote a price when the origin of the leak is not known yet?
      If it is being underfilled? This engine holds 6 quarts with a filter.
      If it is burning the oil then it needs the engine replaced or rebuilt ($5500 about)
      Maybe just valve seals ($1000)
  • AutoMD Member
    AutoMD Member - 1998 Buick Park Avenue - Engine - 1/9/2014
    Blower fan not working
    where is the blower motor resistor on this vehicle?
    • HouseCallAuto
      1/9/2014 HouseCallAuto
      It doesn't use a resistor like you are used to seeing, it uses a Blower motor control module. ACDELCO part # 52478281 and is showing about 45 minutes to replace.

      Remove the right sound insulator. Refer to Instrument Panel Insulator Panel Replacement (Left)Instrument Panel Insulator Panel Replacement (Right) in Instrument Panel, Gauges, and Console.
      Disconnect the electrical connector.
      Remove the blower control module retaining fasteners.
      Remove the blower control module.
  • rod
    rod - 2002 Buick Century - Engine - 1/8/2014
    Fill the radiator and one to two days later the fluid is low.
    I don't see any visible leaks. were does it go so fast?
    • HouseCallAuto
      1/8/2014 HouseCallAuto
      Check and confirm that it is not going into the oil. Pull the dipstick and make sure oil looks normal like you always ]saw it, not like a milkshake color. Besides that, you either have a leak (most likely) or you are burning it from a bad head gasket (least likely), and I'll bet the leak is the intake manifold gaskets at the mating between the manifold and the heads at the angle. A water pump leak is also high on the list.
  • Denys Templeton
    Denys Templeton - 1999 Buick Park Avenue - Engine - 1/4/2014
    When hot engine starts but then dies
    Have changed every component in in this category the last suggestion was problem with vaccum. Any suggestions on this theory?
    • HouseCallAuto
      1/4/2014 HouseCallAuto
      read fault codes and post them here. After reading fault codes and then writing the codes down (remember I said after) try unpl,ugging the mass air flow sensor connector and see if it does not stall now with it unplugged. If it seems to temporarily solve the stalling hot problem with it disconnected then replace the MAF sensor.
  • AutoMD Member
    AutoMD Member - 2005 Buick Rendezvous - Engine - 1/4/2014
    Will a clogged heater core cause my vehicle to overheat?
    Trying to diagnose the problem. No heat, engine overheats and there is a slight coolant leak some place near or behind the alternator. All this happened at the same time. The large rad hoses - the lower is slightly warm but the upper is cold. I was thinking ...
    • Jimm
      1/4/2014 Jimm
      Yes, the clogged heater core would contribute to the overheating condition - due to the restricted coolant flow.
      However, the heater core (coolant circulation) is 'off' during warm summer months - so there still may be other issues, such as a faulty thermostat, clogged / restricted radiator hoses, clogged / restricted radiator.
      One simple test to perform - in order to test the radiator flow is based on gravity. Simply drain the radiator of coolant as the first step, then with the lower radiator hose disconnected (open to drain) refill the radiator using plain water - and observe how fast (or slow) the radiator empties itself based on gravity. If very slow drainage - then suspect a clogged radiator.

      If clogged radiator / radiator tubes is an issue - usually less expense to simply replace the radiator, rather than to repair (especially by the time the labor is calculated).
      The parts are readily available; try these on-line sources;,,,, - to list only a few possibilities. In fact they (RockAuto) list the radiator from around $78.00, and the heater core from around $40.00 for your vehicle.
    • John's Auto Repair
      Since it only branches off to the engine and water pump, it shouldn't cause an overheating problem.
      John's Auto Repair
      1/4/2014 AutoMD Member
      That was my train of thought and the reason for questioning this. If there is no circulation through the motor then it would overheat and you wouldn't have any heat. Will look at thermostat and rad to make sure there is nothing plugged first. Thanks!
  • AutoMD Member
    AutoMD Member - 1998 Buick Regal - Engine - 1/3/2014
    Why does the OBD code P0507 keep coming on in my car? I got everything associated with this code done.
    I got the intake cleaned out, replaced the mass airflow sensor and got a new intake gasket .
  • AutoMD Member
    AutoMD Member - 1998 Buick Regal - Engine - 1/1/2014
    Dash lights dim, then brighten
    At first car wouldn't start - just got clicking sound. Jump started it, let it run for a bit. When I started it the next time, the dash lights were very dim. Then after a few minutes, they got bright. It is VERY cold here. This just started happening. No other ...
    • HouseCallAuto
      1/1/2014 HouseCallAuto
      There is a bad alternator
    • Jimm
      1/1/2014 Jimm
      The parts are readily available; try these on-line sources;,,,, - to list only a few possibilities. In fact they (RockAuto) list the alternator from around $78.00 for your vehicle.
  • Denys Templeton
    Denys Templeton - 1999 Buick Park Avenue - Engine - 12/29/2013
    Engine idle not working properly
    When engine is cold or cool starts O.K. When it is hot it will start O.K. but will stop. Have had 4 different Techs look at this and they have not been able diagnose prob.
    • HouseCallAuto
      12/29/2013 HouseCallAuto
      So if I understand this correct - you are saying that the engine has a stalling problem, it shuts off without warning? The two most common causes of stalling on your vehicle are the mass air flow sensor and / or the crankshaft position sensor. That being said stop paying diagnostic labor and just have both of these parts replaced either together or one at a time. Odds of solving this are greater than 99% if replacing both parts.
  • Al snyder
    • HouseCallAuto
      12/29/2013 HouseCallAuto
      What were the symptoms with the old cluster that you removed?