Aug 102016

1988 Buick Park AvenueI was looking at this car to buy it. When I went to drive the car, it was sitting in park at idle and I noticed a large amount of shaking. So I drove it up the road and the shaking stayed. I never drove over 35 mph. But I’d like to know whats causing the shaking before I consider buying it.


Most likely there is a misfire in the engine causing the shaking. May be as simple as just needing a good tune up or could a burnt valve. Hard to say without doing some diagnosing.

Aug 102016

Buick RegalI have a 1996 Buick Regal. Until recently, it’s ran fine. And then, this past Sunday (as of the time of this post), the RPMs began to shoot up to 5 and 6 and the car lost acceleration. I thought it needed more transmission fluid, but today I found out that I had put too much in it. So my dad and I drained the pan and refilled it, but the car refused to go into gear. Let me rephrase — it would go into gear, but it wouldn’t go anywhere. I found several posts on various sites about how it might be a transmission pump or a transmission lockup solenoid, but the results upon testing them were still the same — no acceleration at all. Does anyone know how this can be fixed without the need for a mechanic?


If the fluid was burnt looking it will need rebuilt. If you hear a whining noise it is the pump.  If the fluid was pretty new looking then it is most likely an electronic solenoid sticking. This will generally set a code. The check engine light will not illuminate as it has to do with the transmission and not the engine. You will need a scan tool in order to pull the transmission codes. The codes will help point you in the right direction. Not much to do without the codes. Feel free to post them below if you have further questions related to this issue.

Aug 052016

2004 Buick Park AvenueWhere is the fuel filter located?


The fuel filter is located under the car along the frame rail.

fuel filter location diagram 2004 Buick Park Avenue

Fuel Filter Replacement

Removal Procedure


   •  There is no service interval for fuel filter replacement. Only replace the fuel filter if the filter is restricted.
   •  Inspect the fuel tank internally and clean the fuel tank if you find a restricted fuel filter.


  • Relieve the fuel system pressure.
  • Raise the vehicle.
  • Disconnect the quick-connect fitting (4) at the fuel filter inlet.
  • Disconnect the threaded fitting at the fuel filter outlet.
  • Drain any remaining fuel into an approved gasoline container.
  • Remove the fuel pipe O-ring.

Installation Procedure


  • Remove the protective caps from the new fuel filter.
  • Install the new plastic connector retainer on the fuel filter inlet. Install the new retainer in the same position as on the old fuel filter.
  • Lubricate the new fuel pipe O-ring with clean engine oil.
  • Install the fuel pipe O-ring.
  • Slide the fuel filter into place.
  • Connect the quick-connect fitting (4) to the fuel filter inlet.


Caution! Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.


  • Connect the threaded fitting to the fuel filter outlet. Use a back-up wrench in order to prevent the fuel filter from turning.



Tighten the fuel filter fitting to 30 N·m (22 lb ft).


  • Lower the vehicle.
  • Tighten the fuel tank filler pipe cap.
  • Connect the negative battery cable.
  • Inspect for fuel leaks.
  1. Turn ON the ignition for 2 seconds.
  2. Turn OFF the ignition for 10 seconds.
  3. Turn ON the ignition .
  4. Inspect for fuel leaks.
  • Install the fuel injector sight shield.



Aug 032016

1997 Buick Park AvenueI have a 1997 Buick Park Avenue and when I flip the switch to turn my high beams on, they don’t come on. And my dash lights and side marker lights go off also. I have replaced the switch with a new one and it didn’t fix it.


Looking at the wiring diagram it would appear as the only thing in common with both the high beam switch and the dash lights would be the Lamp Control Module other than the switch.

Headlight and High Beams Wiring Diagram 1997 Buick Park Avenue

Aug 032016

2001 Buick CenturyI have a problem with my cooling system in my 1999 Buick Century Custom. I am leaking coolant. I tried stop leak, is not working. I can drive for long periods of time, open the radiator cap without any problem. It is cold to the touch and there is no pressure when I release the cap.


Sounds like your thermostat may be stuck in the open position as well as leaking coolant. Also the radiator cap may be faulty if no pressure is building or you have a large leak. You will need to use a cooling system pressure tester.

How to find leaking coolant

  • With the engine off,  Remove the radiator cap and attach the pressure tester
  • Pump up the tester to apply pressure on the system. Pressure should be the same as the radiator cap. (around 17-20 psi)
  • Look for the leak, put cardboard underneath to help if needed. If no external leak is found, remove spark plugs and look for coolant to come out spark plug holes.
  • Repair the leak
  • Pump up the tester again
  • Watch for the pressure to hold, this indicate no more leak in the system.

Coolant Description

Caution! Antifreeze can be added to raise the boiling point of the coolant, but too much will affect the freezing point. Do not use a solution stronger than 70 percent antifreeze, as the freeze level rises rapidly after this point. Pure antifreeze will freeze at -22°C (-8°F).

GM Goodwrench DEX-COOL® was developed in order to last for 240,000 km (150,00 miles) or 5 years, whichever occurs first. Follow the instructions in Draining and Filling Cooling System . Use only GM Goodwrench DEX-COOL® or HAVOLINE® DEX-COOL® when adding or changing the coolant.

A 50/50 mixture of ethylene glycol DEX-COOL® and water will provide the following protection:

  • Give freezing protection down to -37°C (-34°F)
  • Give boiling protection up to 129°C (265°F)
  • Protect against rust and corrosion
  • Help keep the proper engine temperature
  • Let the warning lights and gauges work as they should.
Jul 252016

2002 Buick LesabreThe 2002 Buick Lesabre blower motor at times does not come on and then will start blowing or at other times the blower motor won’t come on for a long while but will sometimes start blowing after a restart.


This is form loose wiring, bad wiring connection or failing blower motor. Most common would be a failing blower motor. The blower motor has internal brushes that wear and begin to make weak contact. Replacing the motor should take care of the issue.

The 2002 Buick Lesabre Blower motor Replacement without Vent Tube


The 2002 Buick Lesabre Blower Motor Replacement with Vent Tube


The 2002 Buick Lesabre Blower Motor Control Processor

The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module provides a PWM signal to the control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.

Air Speed

 The blower motor forces air to circulate within the vehicle’s interior. The vehicle operator determines the blower motor’s speed by placing the blower motor switch in a desired speed position or by selecting automatic operation. The blower motor will only operate if the blower motor switch is in any position other than OFF, and the ignition switch is in the RUN position. In manual operation, once a blower speed is selected, the blower speed remains constant until a new speed is selected. In automatic operation, the HVAC control module will determine what blower speed is necessary in order to achieve or maintain a desired temperature.

As the requested blower speed increases, the following conditions occur:

   •  The IPM increases the amount of time that the blower motor speed control circuit is modulated to ground.
   •  The voltage and duty cycle, measured between the blower motor speed control circuit and ground, decrease.

As the requested blower speed decreases, the following conditions occur:

   •  The IPM decreases the amount of time that the blower motor speed control circuit is modulated to ground.
   •  The voltage and duty cycle, measured between the blower motor speed control circuit and ground, increase.
Jul 072016

2002 Buick LesabreI keep having to change my lights because they keep burning out, headlights, taillights, blinkers, etc. I just changed the turn signal last night. When I went to drive it this morning out again. Tried to replace, now it won’t work at all. What could be causing the lights to go out one by one? The car only has 107,000 miles on it.


Age is the most common reason for a bulb to fail. No different then the light bulbs in the house. The exact timing of each bulb going out is not predictable.

  1. Corrosion
  2. Loose connections
  3. Poor manufacturing of the bulbs
  4. Possible exposure to moisture
  5. Defective wiring harness

The only thing these all share in common is the ground connection. And they would not work at all without it.

Jun 272016

Buick EnclaveWhen I press the air conditioning button on the console display panel; it blinks 3 times, but won’t engage the ac. The owner’s manual says it is the sensor. Where is it located.


There are four air temperature sensors.  Two are on the right and two are on the left. There is an upper and lower.

Temperature Sensor Upper Right Side Location

Air temperature sensor location 2014 Buick Enclave

Temperature Sensor Upper Left Side Location

Air temperature sensor location upper left 2014 Buick Enclave

Temperature Sensor Lower Left Side Location

Air temperature sensor lower left location 2014 Buick Enclave

Temperature Sensor Lower Right Side Location

Air temperature sensor location lower right 2014 Buick Enclave

Other information pertaining to the same issue

The red light blinks three times if you press the air conditioner button when it is below 40. The AC will not work below 40F unless its in the defrost mode, this has been designed into the system for many years to prevent accidental running of the AC in the winter when not needed.

Ive read that the exterior temp sensor- will not take an immediate reading..
and by design may take some miles of driving before it takes a reading- and then displays the updated info on your dash.
Since you have the digital AC system.. the sensors may be reading the PREVIOUS low temp which was 40 or less…
Thus your re-circulation will flash the light…
2 min later- once you’ve driven- a new temp reading has been taken- and now above 40– and now it will work and no more flashing 3 times…

Thats what I think may be happening…. just an idea.

Jun 152016

1998 Buick LesabreJust replaced my battery but something keeps draining it. I checked my alternator and it’s still good. Checked all wires and connections and they all look fine. What could be draining the battery?


An internal short in the battery will mostly go unnoticed. Odds are the battery is greater than 4 years old. Replace the battery and all should be fine once more.

1998 Buick Lesabre Battery Replacement


Battery Charge Low or Completely Discharged

  1. Measure the battery voltage at the battery terminals using a digital multimeter.
   –  A reading of less than 11 V indicates that the initial charging will be very low.
   –  Some time may pass before the battery accepts current in excess of a few milliamperes.
  1. Set the battery charger to the highest setting.
  2. If necessary, disable the polarity protection circuitry:
   –  This circuitry, available on most chargers, prevents charging unless the charger leads are properly connected to the battery terminals.
   –  A completely discharged battery may not have enough voltage in order to activate this circuitry, even though the leads are properly connected, implying that the battery will not accept a charge.
   –  Most chargers have an override or a bypass function. This function will turn on the charger and charge a low voltage battery.
  1. The required battery charge time varies according to the voltage capabilities of the battery charger. A charger of less than 14 volts may take up to 16 hours before the battery appears to be accepting current.
  2. Perform the following calculation in order to determine the amount of time that the battery may need to be charged:
   –  The reserve capacity rating on the battery label is the number of ampere-hours of charge required in order to produce the green hydrometer dot.
   –  After the meter on the charger starts to show current flow, note the number of amps being accepted.
   –  Determine the reserve capacity of the battery.
   –  Divide the reserve capacity by the number of amps shown on the meter in order to determine how many hours of charging is needed.
  1. When the green dot appears in the hydrometer, discontinue charging.
  2. If the green hydrometer dot is not visible after an ampere-hour charge equal to twice the reserve capacity rating, replace the battery.
  3. After charging, load test the battery.