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Buick engine repair questions and answers

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  • tygressjanie
    tygressjanie - 1995 Buick LeSabre - Engine - 11/4/2010
    Between speeds of 25-35mph or 55-65mph the engine seems to lose power, dash lights flash, speedo needle jumps 10-15mph..
    For the past 3 months my car has been doing the following while driving, it started shortly after having the serpentine belt changed after it busted: Between the speeds 55-65mph it will act as though it loses power for a second, then one or several dash lights ...
    • carmando0
      11/4/2010 carmando0
      wow it sound like several problems. had a problem with the tsp throttle position sensor for the strange power surges. could be a grounding problem as well. look for ground wire in the engine to the body and the computer test with a meter or take them off and clean them
  • holls
    holls - 2000 Buick LeSabre - Engine - 11/3/2010
    Why won't my car start?
    My ex and I had a falling out and he "stole" my car because his name is on it as well (even though i paid for it..stupid mistake, i know). I went to retrieve my vehicle and when I turned the key, nothing happened. He said multiple times before that he would simply ...
    • HouseCallAuto
      11/3/2010 HouseCallAuto
      If it were me that wanted to harmlessly disable this particular vehicle, I would unplug (pull up and out) the relay from the underhood relay box. Take the cover off the box and hopefully the relays are marked with titles. The relay that I would assume may be missing (meaning someone removed it) is labled START 1 and if removed you would have all normal functions (lights come on dash) but the starter will not crank. Hope this helps. The owners manual would also detail the labeling of each relay if you turn to the right page, just look up fuse information. You should see if I am right and see if the START1 relay is really missing. And if the oil cap is missing of course put one on but the oil cap missing would not prevent the engine from cranking and starting.
  • billy73
    billy73 - 1996 Buick Skylark - Engine - 11/2/2010
    How to remove and replace the fuel presure regulater
    • Black Ops
      11/2/2010 Black Ops
      Relieve fuel system pressure
      Disconnect neg batt cable
      You might have an intake manifold plenum (remove)
      you also have to remove the fuel rail for your particular engine
      Remove the vaccum line from the regulator
      Place a towel under the regulator to catch any fluid that might drip out then unfastem the FPR retaining screw then remove the FPR by twisting and pulling it from the fuel rail

      Dont forget to use a backup wrench on the fittings to prevent turning

      Throw the o-ring seal away, use a new one.


      Lubricate the new o ring seal with clean engine oil
      PLace the oring on the FPR and install on the fuel rail
      Install the retainer or caot the FPR mounting screws with a thread locking compund, tighten it to around 90 in lbs
      Install the fuel rail

      Note: The fuel return pupe must be connected before tightening the regulator retaining screw to prevent the regulator from rotating. Rotation of the regulator could damage the retainer and spacer bracket and lead to a fuel leak at the inlet.

      connect the fuel feed return line to the fuel rail assy. use a back up wrench on the fitting to prevent them from turning.

      Attach the vacuum line
      If you have plenum now is the time to install it

      Turn ignition to the ON postition for 2 seconds, then turn it to OFF for 10 seconds, tyurn it ON again, check for fuel leaks

    • Bobby
      11/2/2010 Bobby
      fuel pressure regulator is part of the fuel pump sending unit, it is mounted on the gas tank, to replace gas tank must be removed.
  • casa
    casa - 1997 Buick Skylark - Engine - 11/1/2010
    My car is not starting
    i have a 1997 buick skylark custom and i was driving it the other day and it just stopped running. i have tried to turn it over and it turns over but wont start it isn't getting any spark. any ideas
    • RC
      11/1/2010 RC
      Do you have a check engine light on? It could be the crankshaft position sensor.
  • elguaguero69
    elguaguero69 - 2000 Buick LeSabre - Engine - 11/1/2010
    Where I located the map sensor on my vehicle ?
    • RC
      11/1/2010 RC
      See your other posting (duplicate posting).
      11/1/2010 elguaguero69
      Sorry but I don't see any ????
  • elguaguero69
    elguaguero69 - 2000 Buick LeSabre - Engine - 11/1/2010
    Where is the location of the map sensor on my vehicle
  • Joan
    Joan - 1996 Buick LeSabre - Engine - 10/30/2010
    Car runs good, has gas & suddendy dies & won't start. Later it will start,. Happened twice this week.
    Gar gives te impression of having a fuel problem. or something is getting hot (relay switch) Today I called a tow truck and then 50 min later the car started. I don't think that a fuel pump goes out on a gradual basis. I really don't know what to fix.
    • nate
      10/30/2010 nate
      I had the same problem and finally the car didn't start period.I change the fuel pump and the ignition module.
  • Kappy
    Kappy - 2000 Buick Regal - Engine - 10/29/2010
    PO440 - I replaced gas cap with OEM one. Still coding.
    Started with a code 442, now 440. Replaced gas cap with OEM part, Visually inspected vacuum hoses. Car has 118K miles. Only 3 parts in Evap system, lacking a smoke machine, which would be a good bet to replace?
    • Bobby
      10/29/2010 Bobby
      double check gas cap is correct spec. check charcoal canister for any cracks. Also check houses from filler to the tank make sure there is no damage there.
  • buick
      10/29/2010 MOONSTER_TOOLZ
      When you try to start it again did it run continuously or it dies soon you started it again? Check the condition of your battery, maybe low in voltage. Check also your battery cables maybe loose or corroded; clean and attached well the cables. If this does not work and the problem persists, I recommend to have the engine scanned for stored trouble code; and it could possibly a failing temp sensor is the reason.
  • bill
    bill - 1991 Buick Century - Engine - 10/29/2010
    Why does car start,high idle then stall.
    • HouseCallAuto
      10/29/2010 HouseCallAuto
      First thing that comes to mind is a very big vacuum leak.
  • sweet
    sweet - 1992 Buick Roadmaster - Engine - 10/26/2010
    "PLEASE tell me why does my car die out when im not on the accelerator,for example if im in a long slow line of traffic?
    Im not sure of themileage but i already tried the following items map sensor, oxygen sensor, Computer, Fuel Pump Relay, Fuel Pump, Oil Senit unit Switch, fuel filter, it happens no matter if the vehicle is cold or warm, but only when the vehicle is rolling and i am ...
    • yboy82
      10/26/2010 yboy82
      Check the condition of your spark plugs (clean and adjust the gap if needed) and plug wires? It is also possible that your TPS is out of adjustment (adjust to specification). You should also check the condition of your idle air control valve/idle speed actuator/idle stop solenoid. Diagnose your vehicle with a scan tool to know if there is a stored trouble code in your vehicle, even if your check engine light is off there’s still a possibility that you have a check engine light and the only way to verify it is to diagnose your vehicle with a scan tool.
  • j
    j - 1999 Buick Century - Engine - 10/25/2010
    Where is the thermostat located
    • RC
      10/25/2010 RC
      On the engine block at the end of the upper radiator hose.
  • robert duffy
    robert duffy - 1991 Buick Riviera - Engine - 10/24/2010
    Do i need ign. mod. or is there another problem
    engine died while driving. ign. mod. fuse blown (replaced) blows again disconnected ign. mod. blew fuse again
    • HouseCallAuto
      10/24/2010 HouseCallAuto
      Try disconnecting first the fuel pump and see if the fuse still blows. This fuse powers the fuel pump and the ignition module and the fuel injectors and also the oil pressure sending unit. You have to disconnect each thing and try a fuse.
  • Cary
    Cary - 2006 Buick Rendezvous - Engine - 10/23/2010
    Engine shutoff while driving.
    While driving the engine simply quit, like it was shut off. Motor will turn over but won't fire.
    • DrkShdw983
      10/23/2010 DrkShdw983
      Well you have two systems to check: Fuel delivery, and spark. I would guess it's more likely to be a fuel delivery problem so here's a checklist of things to check. Follow it in order for the best results.

      1.) Fuel pump: easiest way to check this is to open your gas cap and listen. While you're listening have a friend turn the key to the on position but do not attempt to start the car. If the fuel pump is working (or at least trying to) you'll hear a buzz noise for a few seconds, then it will shut off. If you don't hear anything than replace your fuel pump.

      2.) Battery: Have the battery load tested for free at a local auto store. Replace it if fails the test.

      3.) Fuel pressure regulator: Unfortunately this can be pretty hard to check. The only way I'm aware of is to hook a fuel pressure gauge up (after verifying that the pump isn't the problem).

      4.) Injectors: It's unlikely but not impossible that all the injectors are clogged or not working. This would definitely throw a check engine light so if yours is on than have the code read.

      5.) Ignition coil(s): I believe these can be tested for free at your local auto parts store. You'll have to ask around.

      6.) Spark plug wires: Make sure there's no corrosion, cracked or missing pieces of insulation, or loose connections.

      7.) Spark plugs: Look for burn marks and corrosion. These are a cheap fix so if there's any doubt, replace them.

      Hope this helps!
  • 90 regal owner
    90 regal owner - 1990 Buick Regal - Engine - 10/22/2010
    Vehicle stalling and starts again and seems like the engine loads up while check engine light is on. o2 sensor maybe?
    car has 130k miles on it. check engine light comes on at times and car runs very rough. it will stall and i can get it started again and it runs very rough. later check engine light goes out and car runs fine
    • Bobby
      10/22/2010 Bobby
      i doubt it is the o2 these early o2's were only used to monitor catalyst efficiency. I would start checking egr, maf sesnor, throttle position sensor. if you can find someone who has a scanner capable of reading obd1 codes for gm then that will help greatly. it could also be missfiring, when was last time spark plugs wires were changed? these also tend to have problems with the coils and ignition module. so check for spark first to see if there is misfiring
    • HouseCallAuto
      10/22/2010 HouseCallAuto
      Read the codes using the method described here >>

      And then repost with codes. Take your time, reading them can be tricky and you can repeat the flash sequence over and over. Like Bobby said, if it has been a long while since a plug and wire change, do that first, however the stalling has another cause. The rough running could be caused by a bad ignition wire on even one cylinder, but the stalling you detail could be a crankshaft position sensor, ignition module, EGR valve or even a bad ECM. Check codes first, write them down, then disconnect the battery for a minute then run the engine again for a while and recheck the codes to see which ones returned.