Jun 012016

1990 Buick RivieraMy son put two stroke gas in his empty gas tank and now it starts but then dies right away. What should he do?


The 2-stroke mix shouldn’t make a big difference at all. If the car has been run out of gas, you will need to prime the fuel system. This can be done by cycling the ignition key on and off 10 times, pausing 5 seconds between each. This will refill the fuel lines and fuel filter in order to allow proper fuel pressure to each fuel injector.

Jun 012016

2001 Buick CenturyI think someone put a TEE in the vacuum line for the brakes and put water down the hose so I have water in my engine, it’s not seized up but how do I get the water all out and get my car running again?


Change the engine oil, run the engine for a couple hundred miles and change it again. Do not run the engine until you change the oil.

Signs of water in oil

  1. Oil level will be higher than normal or show over filled on dipstick
  2. Oil will appear milky
May 132016

2007 Buick Lacrosse Code P2138I have replaced the gas pedal unit which includes the sensor 2 months ago on my 2007 Buick Lacrosse 3.8L. Has been working fine. Then the other day the check engine light came back on with the same code P2138 that says (reduce engine power) which means gas pedal and senor unit again. The problem I’m having the check engine light comes on, I drive it a few times it goes away, but then it will come on again a few days later back and forth, back and forth. What could be causing this to happen please.


The Engine Control Module (ECM) has detected that the APP sensor 1 and APP sensor 2 disagree more than 4.5 percent for less than 1 second. This turns on the check engine light. It is possible that the wiring or connections are faulty. Also possible that the parameters set in the ECM need to be reprogrammed. It is also possible that the “New” part is bad. I would anticipate the repair and part are covered under warranty and as such you should return the vehicle to the repair shop. There is a TSB – Technical Service Bulletin for the Code P2138 with reduced engine power which identifies a repair instrument panel to body harness connector. (see below)

CODE P2138 BUICK – Accelerator Pedal Position Sensor 1-2 Correlation

Code P2138 Possible causes

– Faulty Accelerator Pedal Position Sensor
– Accelerator Pedal Position Sensor harness is open or shorted
– Accelerator Pedal Position Sensor circuit poor electrical connection
– Faulty Electric Throttle Control Actuator

The Accelerator Pedal Position (APP) sensor is made up of 2 sensors that are housed inside one assembly. The Engine Control Module (ECM) supplies a separate 5-volt reference circuit and a low reference circuit for each of the sensors. The 5-volt reference for APP sensor 1 is supplied from the same source in the ECM as the 5-volt reference for the mass air flow (MAF) sensor and the fuel tank pressure (FTP) sensor. The 5-volt reference voltage for all of the sensors is supplied on separate ECM terminals, but the terminals are connected internally to a voltage supply. The APP sensor 1 sends a signal from the sensor to the ECM indicating the accelerator pedal position. The ECM actuates the throttle plates based on this information. If the ECM detects that the APP sensors are not within a predicted value from each other, DTC P2138 sets.

TSB 07-06-04-019E

Intermittent malfunction indicator lamp(MIL) illuminated, DTC P2138 with reduced engine power (repair instrument panel to body harness connector)

Affected models: 2005-2015 GM passenger cars and light duty trucks


  • Some customers may comment on an intermittent malfunction indicator lamp(check engine light) being illuminated with a message or an indicator that displays Reduced Engine Power.
  • The technician may observe on a scan tool DTC Code P2138 – Accelerator Pedal Position (APP) Sensor 1-2 Correlation set as Current or in History.

The condition may be caused by water intrusion into the instrument panel to body harness connector, which carries the APP Sensor signals to the ECM/PCM. The water intrusion results in a voltage difference between APP Sensor 1 and APP Sensor 3 that exceeds a predetermined value for more than a calibrated period of time, setting Code P2138.

Some examples of potential water leaks are: A-Pillar seals, Sunroof drain lines and windshield /cowl sealing.

The Fix:

  1. Verify that aftermarket equipment is not electrically connected to any of the APP sensor signal or low reference circuits or to any other ECM/PCM 5v reference or low reference circuits.
  2. Perform the diagnostic system check – vehicle.
  3. Locate the Instrument Panel to body harness connector, which may be located in and around the left hand kick panel area or inside the instrument panel. Depending on the vehicle and model year.
  4. Inspect for water leak in area. If necessary use a water hose to determine the source of the leak.
  5. Inspect the instrument panel to body harness connector terminals for corrosion and debris.
  6. If any corrosion or debris is observe, repair as needed.
  7. After completing the repair, verify the proper operation of the system.
Dec 182015

99 Buick regal would sometimes not crank or fire when you wanted but next time would start right up, once it died while driving and started back up. The coil packs, wires and plugs are replaced. Would crank and run great before, now it wont crank. Turns over but no fire it seems

Nov 172015

2002 Buick Regal
My car completely died last night. i had to use the release key switch to remove my keys after trying to start it and not even getting a single light on the dash. The only lights that were on an orange bulb in the headlights. I’ve now gotten the inside power working by resetting and using a trickle charger. Those lights are still on now while charging, what are they? and how do i get them off?

Nov 102015

2001 Buick Lesabre
I recently replaced my ac actuator heat door control, the one in the glove box, it did correct my heater not working, but my fan does not blow air out the vents on the dash, the fan does blow air at the floor and the defrost. What controls the air flow at the dash vents?

Nov 072015

2005 Buick Rainer
My car is make a whizzing noise that only occurs when i am accelerating. I suspect it it may ne in the wheel bearing or hub but cant identify which side the noise is coming from. Have u ran across any problems like i have described & if so what might it be. The noise is only getting very rapidly. Thank you for taking time to help me.

Nov 042015

We need to know what to do about toning down vacuum brakes. They are so touchy we afraid to drive. Barely press and almost takes you thru the window.
1968 Buick Lesabre