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Buick engine repair questions and answers

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  • AutoMD Member
    AutoMD Member - 2000 Buick LeSabre - Engine - 5/16/2014
    Gas blows back out while trying to fill the tank
    This just started happening... I've checked the fill tube for a block but it appears fine... you can hear it start to backfill... then trip the nozzle... then spit out down the side of the car.. Even when filling slowly...
    • Jimm
      5/16/2014 Jimm
      The fuel issue is most likely related to a clogged fuel vent tube (routed alongside the fuel filler tube) - this tube can be unclogged using a length of hanger wire. If the hanger wire does not work then the fuel vent tube will need to be replaced.

      Try these sources for the replacement part;, - among others.
  • AutoMD Member
    AutoMD Member - 1993 Buick Regal - Engine - 5/15/2014
    Why won't my car start?
    My car won't automatically start when I try to crank it up. It just does a "click" sound but the engine is not turning over. The only way I can get it to start is with a jump from somebody or hooking it up to my battery charger. I tried to replace the battery with a ...
    • jdl
      5/15/2014 jdl
      What about your battery cables and connections? I'd have to check voltage and ground at the starter motor. It could be a starter problem? Some of the national brand auto stores will test the starter for you, if you take it off and take it to them.

      I'd have to sure the battery has a full charge.
      5/15/2014 AutoMD Member
      The battery is charged, but im not sure about the cables and connections. Havent gotten those checked out as of yet. The online diagnosis on this website informed me that it might be the starter or a seized engine which i hope its not the engine.
    • GT500Knights
      5/15/2014 GT500Knights
      You can check for a seized engine yourself, if you have the tools. Get a large ratchet or breaker bar. Fit the appropriate size socket onto the crankshaft pulley (AKA harmonic balancer) bolt. It's usually a large bolt ranging from 17-23mm or 3/4-1". With the key out of the ignition, attempt to rotate the engine in its normal rotating direction (for GM vehicles [including buick], the direction of rotation is clockwise if you are facing the front of the engine. Keep note that some resistance is normal if the spark plugs are installed. This is due to compression buildup in the cylinders. When you rotate the engine you should be able to complete two revolutions. It is a good idea to not rotate the engine in the opposite direction. If you encounter a situation where you cannot rotate the engine no matter how much force you apply, one of two things come to mind. (1) your engine is hydrolocked (coolant in the combustion chamber). Water is not compressible. (2) bent pushrod.

      I would definitely check also how much voltage drop is present between the battery positive post and the starter motor positive (not the s-terminal). Be careful not to place your hands or anything like hair, necklaces into the path of anything moving. Using a volt meter set to dc volts within the 2 or 20 volt range, connect one lead to battery positive and the other lead to starter positive. Have a helper crank the engine over. Voltage should typically not exceed .5 volts, but if it exceeds 1 volt, there is a problem with the connections or cable itself. Check the ground side itself. This is done in the same manner, except connect one lead to battery negative, and the other lead to the body of the starter motor. The starter motor grounds itself to the engine block, and thereby connects to the battery through a series of connections that run from the engine block, to battery and/or chassis. You should also see no more than .5 volts. Excessive rust or corrosion or looseness of cables will affect how much energy the starter motor can draw.

      The starter motor itself may also be defective. Remove it and have it tested at your local auto parts store.
  • AutoMD Member
    AutoMD Member - 1998 Buick LeSabre - Engine - 5/12/2014
    • alex
      5/12/2014 alex
      random problems what are they and how random.
  • kailyn
    kailyn - 2005 Buick Rainier - Engine - 5/11/2014
    Ac wont blow cold blows heat only it blows out off all vents
    Blows heat tryed to charge gauge reads full what do i check next
    • CVO
      5/11/2014 CVO
      The blend door actuator is a servo responsible for controlling the mix of warm air from the heater core and cool air from the A/C and outside. If it malfunctions, your climate control system may not respond properly when you change the temperature on the climate control system.

      Both the manual and the automatic systems use this servo to control the blend door. If your ATC system fails to automatically change temp, this is also an indicator that the servo has failed.

      The Mode Door Actuator controls the direction of airflow. It selects which way air flows through the different ducts. If your climate control system has lost the ability to control which vents the air comes out of, the MDA has probably failed. Both the ATC and MTC systems use this device.

      Both failures can be seen by the climate control system's integrated diagnostics system.

      Check the blender door actuator, it's made out of plastics and it's common for failure.
    • Chevy doctor
      5/11/2014 Chevy doctor
      Try pulling HVAC fuses and then reinstall them after waiting a few minutes. I have reset many HVAC controllers this way and it creates a actuators to reset themselves. Then start vehicle and slowly change all modes and temps and see what you get. Most of these fuses are located under LR seat fuse block.
  • AutoMD Member
    AutoMD Member - 2006 Buick LaCrosse - Engine - 5/7/2014
    What could be causing car to have poor fuel economy after being tuned up
    replaced all spark plugs, wires and air filter a few weeks ago. Engine light is still on continuously and fuel economy is very poor. Getting approximately 13mpg. When I first purchased car it was getting much better fuel economy.
    • GT500Knights
      5/7/2014 GT500Knights
      Have the codes pulled--it'll make things much simpler as far as diagnosis goes. Poor fuel economy can be due to a great number of things. If the check engine light is flashing, then you have a serious issue.
  • Winks
    Winks - 2006 Buick LaCrosse - Engine - 5/7/2014
    Engine shuts off after restarting when warm
    Car shuts off after restarting with warm engine. Only happens after car sits, then is restarted. It will shut off then can be restarted after a minute or two. It then runs with check engine light and reduced power. Tried new throttle body no luck. Codes given: ...
    • GT500Knights
      5/7/2014 GT500Knights
      P0606 Buick - Engine Control Module Internal Performance Error
      Possible causes
      - Engine Control Module (ECM) Harness power supply circuit is open or shorted
      - Engine Control Module (ECM) Programming
      - Faulty Engine Control Module (ECM)

      U0107 Buick - Lost Communication With Throttle Actuator Control Module
      Possible causes
      - Faulty Throttle Actuator Control (TAC) module
      - Throttle Actuator Control (TAC) module harness is open or shorted
      - Throttle Actuator Control (TAC) module circuit poor electrical connection (loose or broken wires)
      5/11/2014 Winks
      Checked harness continuity -ok. Replaced Throttle Body, still have problem. This only happens when it reaches peak running temperature. Neighbor told me he had similar problem that turned out to be ignition switch. How could temperature affect that? Is that a possibility?
      5/11/2014 Winks
      One other thing - is the computer sensitive to heat? Could it error out when a certain temperature is reached? Fuse box issue possibly? I still think this is temperature related....
  • AutoMD Member
    AutoMD Member - 1988 Buick Electra - Engine - 5/7/2014
    Hesitation on Acceleration?
    I recently purchased a 1988 Buick Electra Park Avenue, 3.8 L V6. She runs strong while idling, but if you pull the throttle cable, it acts like it is losing power. With the assistance of a family-friend who is a master mechanic, we took out the fuel rail, cleaned ...
    • GT500Knights
      5/7/2014 GT500Knights
      Check for vacuum leaks. Exhaust back pressure will also cause hesitation in acceleration. The maf sensor itself may be faulty, even though it was cleaned out. If the PCM does not get the correct signal as to how much air is flowing, the incorrect fuel mixture will enter the combustion chamber
      5/8/2014 AutoMD Member
      Thanks, I'll give it a shot and see what happens!
  • AutoMD Member
    AutoMD Member - 2002 Buick LeSabre - Engine - 5/4/2014
    What is causing my car to not even turn over?
    I have tested the battery and replaced the starter. I've tried jumping it off but it still won't turn over. I can't get power when I turn the key to the on position but when I turn the key to the Aux position the radio and door chime will come on. Could this be a ...
    0 answer
  • AutoMD Member
    AutoMD Member - 2003 Buick Regal - Engine - 4/28/2014
    Engine dies while driving.
    My Buick 2003 Regal suddenly dies while driving. The engine stalls then all dash lights are on. Turning the key will start it again. This shows me there was a brief interuption to the electrical system. This happened in the rain so I suspect electrical issues. Once ...
    • jdl
      4/28/2014 jdl
      My first thought is an intermittent rpm signal, that signal comes from crank sensor. I can't rule out an electrical issue like you suggested. Are there any applicable trouble codes? Intermittents can be a pain.
  • AutoMD Member
    AutoMD Member - 1983 Buick Regal - Engine - 4/25/2014
    Starter bendix housing keeps cracking
    Third starter with cracked bendix housing. First one lasted 4 years. Second one 2 years. Last one lasted only one week. According to parts store this is caused by backfiring. Haven't noticed any backfiring while driving. But seems like the backfire would have ...
    0 answer
  • AutoMD Member
    AutoMD Member - 1983 Buick Regal - Engine - 4/25/2014
    Starter bendix housing keeps cracking
    Third starter with cracked bendix housing. First one lasted 4 years. Second one 2 years. Last one lasted only one week. According to parts store this is caused by backfiring. Haven't noticed any backfiring while driving. But seems like the backfire would have ...
    0 answer
  • AutoMD Member
    AutoMD Member - 1997 Buick Park Avenue - Engine - 4/23/2014
    How do I get my car to run after replacing battery.
    After replacing battery in my 1997 park ave it now is giving me a "unknown driver" readout due to security system. How do I get past this problem are there codes or certain procedures to follow to get my car going again if so how do I obtain the codes or procedures ...
    • CVO
      4/23/2014 CVO
      A. Not sure if this procedure could apply to your vehicle.

      Doing the Passlock theft system relearn:

      1. Verify that the battery is fully charged.

      2. Use your code reader to clear any fault codes.

      3. Turn the ignition switch from the OFF position to the CRANK position, allowing the engine to start/stall.

      4. Release the key, leave the ignition in the ON position for a 11 minutes. Do not continue until at least 11 minutes has passed or the relearn will abort. Going over 11 minutes is OK.

      5. After the 11 minute cycle, turn the key off for 15 seconds.

      6. Repeat Steps 3-5 two more times (3 times total).

      7. After the 3rd cycle, the theft system should synchronize to the new Passlock sensor. It should start and run normally.

      8. Remember that this may get you going but is not a permanent fix. Your permanent fix is likely to replace the Passlock sensor which is the ignition lock cylinder and housing.

      B. If the step A isn't working, see this URL
  • AutoMD Member
    AutoMD Member - 2006 Buick Lucerne - Engine - 4/23/2014
    Changed dead battery and now vehicle will not start. Door and trunk auto lock and unlock will not work from remote.
    Cannot access DIC Special Features, P N R D 1 2 indication does not show, lock releases in vehicle for doors and trunk do not work.
    0 answer
  • guy
    guy - 1994 Buick LeSabre - Engine - 4/22/2014
    My 1994 lesabre hard starting and when she does start runs very rough puffing out blue smoke and will just keep stalling
    out, changed cooling temp sensor and still have same problem, has new iac map sensor throttle position sensor
    0 answer
  • AutoMD Member
    AutoMD Member - 1990 Buick LeSabre - Engine - 4/18/2014
    No spark on #1 & #4 cylinders idles rough
    changed coil pack 192000 on engine
    • HouseCallAuto
      4/18/2014 HouseCallAuto
      Bad ignition control module is likely. You know, the expen$ive part under the coils....
      4/19/2014 AutoMD Member
      thank you for the help you gave me. I finally found a site for free Thank you again Dan