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Buick engine repair questions and answers

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  • Dennis
    Dennis - 2000 Buick LeSabre - Engine - 10/26/2014
    What causes my engine to die at idle or decelaration to slow RPM?
    Once the RPM is = to or close to cruise RPM engine runs great. When first starting a cold engine it runs and idles great. After 5 - 10 minutes at idle it surges a couple of times then hard to start and can only keep it running by getting RPM to 1500 or above.
  • Jan
    Jan - 2003 Buick Regal - Engine - 10/25/2014
    Why does my car die when I use a turn signal? Why does the instrument panel lights all flash and car won't start?
    64000 miles on vehicle, car has been checked by diagnostic computer with no results.
    0 answer
  • Jan
    Jan - 2003 Buick Regal - Engine - 10/25/2014
    Why does my engine die when I use a turn signal? All instrument panels come on and flash - car won't start.
    64,000 miles, car has been put on diagnostic computer , no help. When car is running and I use a turn signal the car dies and won't start for a while. All the instrument panel lights come on flashing and it won't start.
    0 answer
  • Pat
    Pat - 2000 Buick Regal - Engine - 10/22/2014
    What is a resonator (part of exhaust system)?
    The catalytic converter cracked, which I recognized from the sudden-onset deafening noise that wouldn't go away. The shop said they needed to replace the entire exhaust system. This included a resonator and muffler in addition to the catalytic converter. I don't ...
    • Jimm
      10/22/2014 Jimm
      The resonator is located ahead of the muffler - similar in nature - the resonator simply quiets the exhaust pulses from the engine.

      Not sure if the entire exhaust system would need replacing at the same time - all depends upon the condition of the components.
  • Dave
    Dave - 2003 Buick LeSabre - Engine - 10/21/2014
    Car occasionally cranks but won't start
    Usually starts fine but occasionally cranks without starting. Computer control module recently replaced but didn't help. Battery and alternator fine No security light flashing so it doesn't appear to be PassKey issue. Happens when both hot and cold. Every time I ...
    0 answer
  • guy
    guy - 1994 Buick LeSabre - Engine - 10/16/2014
    Has been tuned up, new fuel pressure regulator, icm,fuel pump, iac and a few other parts, car is hard starting, cranks
    over strong but takes a few times for her to usually start
    0 answer
  • Ed
    Ed - 1998 Buick Park Avenue - Engine - 10/12/2014
    I have black sludge on the inside of the radiator cap. What would cause that?
    203,000 miles. For the past year I have had coolant disappearing from the overflow reservoir and the radiator, and I keep having to fill it up. I thought it might be an old, leaking radiator cap, so I bought a new one last winter, but noticed the old cap had the ...
    • Jimm
      10/12/2014 Jimm
      Could be oil residue building up in the coolant. Can you take a picture of the gunk? You can also get this by mixing colors of antifreeze. The only exception being the orange stuff that states on the container that it can mix with other types. Mixing green with red for example will cause it to gel and make some nasty build up. A small gap in your head gasket going between a coolant passage and oil passage can cause this too. It is possible to blow a head gasket and not have a performance or smoke issue, all depends on where the gasket blows through. While most common to blow between cylinders because of the combustion pressures, it is entirely possible to have a head gasket issue that doesn't involve cylinder seal.

      Before jumping the gun. Drain your cooling system, remove the thermostat and reinstall the upper hose connection / thermostat housing. Then use a hose to flush through the upper radiator hose and let it run out the engine. through the lower hose. Flush out your radiator too.
  • Buick 2003
    Buick 2003 - 2003 Buick LeSabre - Engine - 10/11/2014
    Changed water pump, belt, radiator and thermostat and car keeps overheating, seems something is blocking engine radiato
    Radiator keeps backflowing even though its brand new, what could cause water not to flow from engine through radiator if parts are new? Could an engine flush work? Car has 120,000 miles
    • wildman
      10/11/2014 wildman
      Have it tested in shop. Sounds like a crack in intake making it turn to steam and forcing thermostat closed.
  • o.hunn
    o.hunn - 1992 Buick Park Avenue - Engine - 10/9/2014
    Why does the engine hesitate/sputter accelerating after a stop
    all fluids have been checked
    • Jimm
      10/9/2014 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
  • wilma
    wilma - 1987 Buick LeSabre - Engine - 10/8/2014
    Engine dies without warning
    engine starts ok then after it warms up it will just die and won't start up again for several minutes. it will only run approx. 15 to 30 min. before it dies. mileage is approx. 170.000 it does this without warning while going down the road.. all the time... six ...
    0 answer
  • AudraDay
    AudraDay - 2002 Buick Regal - Engine - 10/6/2014
    My buick has slow leak coming from sort of back/center of engine
    ..and I replaced water pump/thermostat a few months ago and it appears to still be functioning and not leaking so I opted to bring car in to shop where they replaced manifold after car overheated one time. So I've had my car back a few weeks and noticed small leak ...
    0 answer
  • Rick
    Rick - 2003 Buick Century - Engine - 10/1/2014
    Battery Drain on Buick Century
    My mechanic stated that the ignition lock cylinder on my 2003 Buick Century could be causing the battery to go dead because you can remove the key from the ignition in any position. Battery, alternator, charging checked out OK. Battery is brand new. Amp drain is ...
    • Jimm
      10/1/2014 Jimm
      Yes, that is a possibility. Check the various on-line vendors;,,, to list only a few. For example, they (RockAuto) list the ignition lock cylinder from around $77.00 for your vehicle.
  • paul
    paul - 2004 Buick LeSabre - Engine - 10/1/2014
    Engine turns over fine but no spark---suspect ignition problem or anti theft control module problem
    my buick has about 80k miles...came home for lunch for a few minutes and went back to car and it cranks fine and is getting fuel but apparently no spark---i pulled spark plug wire and inserted nail and see no spark and i can smell the unburned fuel when i crank the ...
    0 answer
  • tim
    tim - 2000 Buick Regal - Engine - 9/29/2014
    How to take out the radiator so i can change it
    i need to know how the radiator comes out
    • Jimm
      9/29/2014 Jimm
      Remove headlamp fascia panel support bracket fasteners with 4 bolts.
      Remove brackets --2 of them.
      Remove radiator support brackets -- 2 of them.
      Remove air cleaner assembly.
      Remove the upper tie bar fasteners, 4 bolts with heads on engine side. Remove tie bar.

      Remove hoses.
      Remove oil cooler pipe bracket bolt from LOWER tie bar, under the radiator lower hose.
      Remove cooling fans.

      Slide plastic cap off transmission oil cooler pipe quick connect fittings.
      Disconnect upper and lower cooler pipes
      Remove AC condenser mounting bolts--one on each side holding AC to the radiator bracket.
      Lift radiator up and out.
  • Gregs Home Repair
    Gregs Home Repair - 2000 Buick Regal - Engine - 9/29/2014
    Why my vehicle will not start unless you shake or move the gear selector?
    The vehicle has 120.000 miles. It has begin to die out sometimes while driving. It doesn't happen all the time. The problem begin about a month ago, its was starting fine until today it begin to act as if no current is getting to starter. I can move the gear ...
    • jdl
      9/29/2014 jdl
      Maybe a problem with neutral safety switch? Also, check for slack in the shift cable.

      Does it crank better, neutral vs park position?