Nov 162019

Buick Lacrosse Starting Disabled

Will a salvage yard ECM plug & play or does it need to be re-flashed? Will pull it out of same year & model. It is a 2005 Buick LaCrosse 3800 v6.

In short, Yes it will need to be programmed to match your vehicles vin# according to the manual procedure below.

Powertrain Control Module (PCM)


This procedure should only be performed when the PCM is replaced, when requested by the PCM or when informed by a service bulletin. In order to perform this programming procedure, access to a General Motors’ Techline Information System 2000 PC Techline Terminal will be required.

1. Turn ignition switch to the OFF position.

2. Connect a suitably programmed Tech II, or equivalent, scan tool to Data Link Connector (DLC).

3. Turn ignition switch to the ON position and turn all accessories off.

4. Select “Service Programming” from scan tool menu.

5. Input vehicle information requested by scan tool.

6. Select type of module to be programmed and type of programming to be performed.

7. Compare VIN displayed on scan tool with vehicle VIN. If VIN does not match, write down actual VIN and correct at Techline terminal.

8. Exit “Service Programming” and turn off scan tool.

9. Disconnect scan tool from DLC connector and turn off ignition switch.

10. Connect scan tool to Techline Terminal and select “Service Programming.”

11. Select type of scan tool and type of programming to be performed.

12. Verify displayed VIN with vehicle VIN, correct as required.

13. Select type of module to be programmed, then identify type of programming to be performed as follows:

a. Normal: This type of programming is for updating an existing calibration or programming a new controller.

b. Vehicle Configuration Index (VCI): This selection is used if the vehicle VIN is unavailable or is not recognized by Techline Terminal. The Techline Customer Support center will have to be contacted to use this option.

c. Reconfigure: This type of programming is used to reconfigure a vehicle, such as tire size or axle ration changes.

14. Select appropriate calibration file and verify all connections are secure.

15. Select “Reprog” to initiate download of new calibration to scan tool.

16. After download is complete, turn off scan tool and disconnect from Techline Terminal.

17. Connect scan tool to DLC.

18. Turn scan tool on, then the ignition switch to the ON position.

19. Select “Service Programming” and “Select Program.”

20. After download is complete, exit “Service Programming.”

21. Turn ignition switch off for 30 seconds.

22. Turn scan tool off.

23. If control module was replaced, perform the following service procedures:

a. CKP system variation learn.

b. GM Oil Life System resetting.

c. Program theft deterrent system.

Oct 302019

You gave me the labor time to replace the valve spring on my Enclave and I was shocked to see it was only 7.9 hours. My question is can you tell me what special tools are needed? Also do you know what all is required to be removed to do this I have already pulled the intake and valve cover but I thought it would need the timing chain removed so the cam can be pulled to do the spring but I cant imagine all that is done in just 7.9 hours so I am trying to figure out how this is done?

To be clear the Labor time to remove and replace the valve springs is 7.9 hours for the right bank only. It is 12.3 for both banks.

For full instructions that include images and diagrams Select your vehicle specific Auto Repair Manual Here.

2010 Buick Enclave R&R Valve Spring Labor Time

Model Year Skill Code Factory Time LABOR Time
 Acadia, Acadia Limited,
  All Cyls,
   Right Bank ……………………… 2009-17 B 7.9
   Left Bank ………………………. 2009-17 B 8.3
   Both Banks ……………………… 2009-17 B 12.3
 Enclave, Traverse,
  All Cyls,
   Right Bank ……………………… 2009-17 B 7.9
   Left Bank ………………………. 2009-17 B 8.3
   Both Banks ……………………… 2009-17 B 12.3
Includes: R&I Valve Cover & Spark Plugs.

Valve Spring Replacement – Right Side

Special Tools
  • EN 46106 Flywheel Holding Tool
  • EN 46110 On-Vehicle Valve Spring Compressor
  • EN 46116 Valve Stem Seal Remover/Installer
  • J 39313 Spark Plug Port Adapter
Removal Procedure
  1. Remove the starter motor.
  2. 2010-buick-enclave-starter-removal-diagram



    If the EN 46106 flywheel holding tool is not installed, the crankshaft may rotate. If the crankshaft rotates, disassembly and reassembly of the entire camshaft timing system may be required.

    Install the EN 46106 flywheel holding tool in order to prevent crankshaft rotation.

  3. Remove the camshafts and rocker arms.

    Camshaft, Replace

    1. Remove camshaft cover as outlined under “Valve Cover, Replace.”
    2. Remove mounting bolts and position power steering fluid reservoir aside. Do not disconnect power steering pipes or drain power steering fluid.
    3. Disconnect connectors, then remove mounting bolts and Camshaft Position (CMP) sensor.
    4. Disconnect connector, then remove mounting bolts and CMP actuator solenoid.
    5. Remove crankshaft balancer as outlined under “Crankshaft Damper, Replace.”
    6. Rotate crankshaft until camshafts are in neutral, low tension position using crankshaft rotation socket tool No. EN 46111, or equivalent. Camshaft flats will be parallel with camshaft cover rail.
    7. Hold camshafts in place with suitable open end wrench, and loosen camshaft position actuator bolt.
    8. Install timing chain retention tool No. 46108, or equivalent, over lefthand secondary timing chain.
    9. Mark timing chain and actuators for installation alignment.
    10. Remove actuator mounting bolt.
    11. Remove camshaft locking tool from lefthand camshafts, and position lobes in neutral position.
    12. Maintain bearing caps in order for installation in original position.
    13. Remove mounting bolts, bearing caps and camshafts.
    14. Reverse procedure to install, note following:
    a. Ensure crankshaft is in stage one timing drive assembly position.
    b. Ensure camshaft sealing rings are in place in camshaft grooves.
    c. No. 4 identification ring for lefthand intake camshaft is machined off (1); No. 5 identification ring for lefthand exhaust camshaft is machined off (2).
    d. Apply liberal amount of suitable to camshaft journals and lefthand cylinder head camshaft carriers.
    e. Ensure bearing cap raised feature is toward center of cylinder head.
    f. I indicates intake camshaft.
    g. E indicates exhaust camshaft.
    h. Nos. 2, 4 and 6 indicate lefthand cylinder position from front of engine.
    i. Nos. 1, 3 and 5 indicate righthand cylinder position from front of engine.
    j. Apply liberal amount of suitable lubricant to camshaft bearing caps.
    k. Torque camshaft bearing cap bolts to 89 inch lbs. in sequence.
    l. Loosen center intake camshaft bearing cap bolts Nos. 1 and 2, and center exhaust camshaft bearing cap bolts No. 3 and 4.
    m. Torque camshaft bearing cap bolts 1, 2, 3 and 4 to 89 inch lbs.
  4. Remove the spark plug from the applicable cylinder.
  5. Install the J 39313 spark plug port adapter to the applicable cylinder.
  6. Connect the J 39313 spark plug port adapter to a compressed air source.
  7. 2010-buick-enclave-valve-spring-compressor

    Install the EN 46110 on-vehicle valve spring compressor above the applicable cylinder as shown.

  8. Tighten the EN 46110 on-vehicle valve spring compressor valve spring compressor nut (2).
  9. 2010-buick-enclave-valve-spring-removal

    Remove valve keepers

    Remove the valve keepers.

  10. Loosen the EN 46110 on-vehicle valve spring compressor valve spring compressor nut.
  11. Remove the valve spring retainer.
  12. 2010-buick-enclave-valve-spring

    Remove the valve springs.

  13. 2010-buick-enclave-valve-seal-removal

    Use the EN 46116 valve stem seal remover/installer  (1) in order to remove the valve stem seal (2).

Installation Procedure
  1. 2010-buick-enclave-valve-seal-removal

    Use the EN 46116 valve stem seal remover/installer  (1) in order to install the valve stem seals (2).

  2. 2010-buick-enclave-valve-spring

    Install the valve spring.

  3. Install the valve spring retainer.
  4. 2010-buick-enclave-valve-spring-removal


    Install the EN 46110 on-vehicle valve spring compressor above the applicable valve spring as shown.

    Tighten the EN 46110 on-vehicle valve spring compressor valve spring compressor nut (2).

  5. 2010-buick-enclave-valve-spring-compressor

    Install the valve spring keepers.

  6. Remove the EN 46110 on-vehicle valve spring compressor .
  7. Disconnect the J 39313 spark plug port adapter from the compressed air source.
  8. Remove the J 39313 spark plug port adapter .
  9. Install the spark plugs.
  10. Install the rocker arms and camshafts.
  11. Remove the EN 46106 flywheel holding tool .
  12. Install the starter motor.

For full instructions that include images and diagrams Select your vehicle specific Auto Repair Manual Here.

Replacing the transmission 2011 Buick Enclave CXL

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Aug 122019

Buick Enclave

I am replacing the transmission and I have it in to within 1 1/4″ and it won’t go any further. I’ve turned the u-joint and the flywheel and it won’t go in. I have 4 bolts in and can’t pull it in anymore.

Couple of reasons for this:

  • Pilot bearing, if equipped, is not lined up right
  • The Torque converter is not properly seated all the way.
  • Transmission is not lined up and binding. (WIGGLE IT)

The most common reason is the torque converter not being installed correctly. The converter needs to be push in, then twisted and push in one more notch. So you would hear a cluck when you first slide the torque converter in. While continuing to apply pressure spin the converter till it clucks once more.

A quick way to make sure is to note that the converter sets far back inside the bell housing once inserted.

2005 Buick Rendezvous 200,000 bangs into gear

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Mar 262019

 Buick Rendezvous

This vehicle is having some transmission/shifting issues. Don’t know if it is worth paying to have it fixed. It seems to “bang”into whichever gear as it is accelerating. Fluid is full and clean.

Is it worth paying to have it fixed, the response here: will pertain to this one as well.

You may want to have the vehicle scanned for any existing transmission codes. This will will take you to the exact source of the issue. It may be as simple as a speed sensor not sending the right signals.

Buick Code P0128 and starting trouble – SOLUTION

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Jan 212019

Buick Lesabre

Back story/what we have done so far. It is a 2003 Buick Lesabre with 102k miles.

Car started “overheating” on us

Car started “overheating” on us, no engine light. Temp gauge would go from reading halfway to all the way in the red within 1 second. Sometimes it would bounce back down right away, sometimes you’d have to turn off car and restart for gauge to normalize. Verified with infrared thermometer that car was not actually overheating, temp was always 190-200. After doing this for 3 or 4 times, engine light came on and car threw itself into limp mode would not go past 3rd gear. Parked the car until coolant temp sensor and thermostat were both changed. Since then been driving the car around for about a month with no temp issues. Temp stays constant at 194. However engine light will not go away, still showing code for coolant temp sensor. Will try to clear code manually and see if if comes back on.

However a new issue has arisen and I am not sure if it’s related. 3 times now when trying to start car after quick errand, car won’t start unless I give her a lil gas. This is not a problem in the morning and not all the time. Only after for example running into the store for about 5 min and coming back out to restart car. If I am gone for longer periods of time like in the store for 30-45 there is no problem starting. Only after turning it off then trying to restart within a few min. After I get it started it runs fine. Temp still ok, no idle issues. Threw some injector cleaner in and will be replacing fuel filter soon. Any thoughts? Are these two issues related?

I do not think the two issues are related. The second issue sounds like a idle air control valve sticking. This issue doesn’t throw a code. But from how you explained being able to press the accelerator pedal a little allows it to start tells me the story. Cleaning and or replacing the IAC Valve should take care of that issue.

Buick Code P0128  – Engine Coolant Temperature Below Thermostat Regulating Temperature

Possible causes for code P0128

  • Leaking or stuck open thermostat
  • Low engine coolant level
  • Insufficient warm up time
  • Faulty engine coolant temperature sensor
  • Engine coolant temperature sensor harness is open or shorted
  • Engine coolant temperature sensor circuit poor electrical connection


Dec 212018

Buick Lesabre

Intermittently, when I turn the key to start the car, nothing happens for a second then the starter engages and the car starts and runs fine. Changed starter, coil packs and swapped relays for ignition also had charging system and battery tested all fine. It can go for days between incidents.

Unfortunately intermittent problems are difficult for anyone to diagnose.  Only when it will not start can you try to test and diagnose the issue.

Drivers side blowing cold air 1998 Buick Century Limited

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Nov 292018

Buick Century

Drivers side blowing cold air

1998 Buick Century Limited: It’s winter and I would like hot air to come out of both the driver side and passenger side middle-level vents. The problem seems to be that temperature is working for the passenger side but not the right side. Here are some clues:

– No amount of fiddling with the HVAC buttons in Auto or Manual mode seemed to fix the problem. Most of my tests were in manual mode because Auto seemed to behave the same. Also DUAL mode was OFF during these tests.
– Changing the temperature changed the temperature of the air on the passenger side but the driver side remained cold and unchanged. When temperature was set lower, both side would push cold air. At max high-temp, still cold air on driver side and then passenger side back to hot.
– I performed a ‘reset’ by disconnecting the battery for an hour
– Upon re-connection, the first thing I noticed was that the yellow Auto button light on the HVAC head was working. This wasn’t working before.
– The second thing I noticed that the fan wouldn’t come on. By fiddling with the buttons for 5 minutes, the fan came on.
– However, as soon as the fan came on, lo and behold, I got hot air coming from both driver and passenger side vents!
– To verify that this was not just a one-time thing, I turned the car off and then on.
– Immediately the original problem returned: cold air on driver side, hot air passenger side.
– The fan was also hard to start but I noticed that if I removed and put back the blower fuse, the fan would almost always start working again. (The fan is more of a red-herring….the temperature problem is the main thing I need to solve.)
– Btw, somewhere along the way the Auto button yellow light stopped working again.
– I noticed something weird: When HVAC was off, whenever a pushed a button to turn the unit on, I could hear the engine strain. It acted like, no matter what, the A/C compressor was turning on (even though the temperature was set to max-high and it was cold outside).
– Sure enough, I noticed the A/C clutch would engage whenever a button was pushed on the HVAC. I removed the fuse for the A/C clutch.
– From this point on, the compressor did not engage, however the driver side vent continued to blow “cool” (but not cold) air. Passenger side still hot.
– During testing, somehow, magically, after the HVAC was on for about 10 minutes, the driver side started blowing hot air.
– I turned car off and then on, and the problem returned immediately. The driver side blowing cold air, passenger side hot
– This morning on way to work, I waited to see if the driver side would magically start blowing hot. It didn’t.
– Then, after about 10 minutes, just on a hunch, I lowered the temperature as low as it could go, and then raised it again to max
– Voila, both sides start blowing hot air.
– My question: Is there a driver side thermostat separate from the passenger side? If so, it seems like the driver side thermostat always thinks that the temperature is “too hot” and thus turns the A/C on and then channels the A/C cold air into the driver side vents because it thinks it should be cooling the driver off even though it should be heating things up. Also, apparently, even when the A/C clutch is disconnected, it puts some flap in position to channel air from the A/C to the driver side vent, rather than channel air from the heater.
– At first thought, one might think that the driver side actuator that controls a flap may be at fault. However, if this were true, why would the HVAC be initiating the A/C clutch when it shouldn’t? If it was just a flap actuator problem and the thermostat was working properly, the A/C clutch would not be engaged, but the driver side would blow “cool” (outside) air.

Thoughts and suggestions much appreciated.

Thank you for such a detailed description of your problem. 99% of the time when this issue occurs, the problem is in fact the Drivers Side Actuator.  They tend to stick and chew up the gears yet occasionally allowing it to work. The other 1 % of the time the door or linkage is damaged. This is quite common with all vehicles manufactured with electronic actuators.

Labor Time to Replace the Actuator is 1.0 Hours.

Actuator Replacement Procedure – Drivers Side

  • Disconnect the negative battery cable
  • Remove the instrument panel and instrument panel carrier
  • Unplug the temperature valve actuator harness connector
  • Remove the mounting screws, then temperature valve actuator.
  • Install in reverse order

Actuator Location Chart

Actuator location chart


1985 Buick Electra Park Ave (3.8) has no power

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May 012018

1985 Buick Electra Park Ave

Okay, Here’s what’s happening:

The car starts and idles fine but has no power. When I try driving it. it barely goes. I can’t get it up past 25 or 30 MPH. WHAT COULD BE WRONG?

– The battery is new and is charging fine
– Plugs and wires are new
– The MAF Sensor has been removed and cleaned (with the special MAF cleaner)
– It’s not transmission related
– The car has low miles (90k) ad has been well-taken care of

Sounds like a lack of fuel.

Flow Test

  1. Allow the fuel pressure to bleed off.
  2. Disconnect the fuel feed line and install a hose on the line.
  3. Apply battery voltage (using a fused jumper wire) to terminal “G” of the Assembly Line Date Link (ALDL) connector located under the dash. Terminal “G” is the first terminal on the left of the bottom row.
  4. The fuel pump should supply 1 ⁄ 2 pint or more in 15 seconds.

Pressure Test

  1. Allow the fuel pressure to bleed off.
  2. Obtain two sections 3 ⁄ 8 in. steel tubing. Each should be about 10 in. (254mm) long. Double-flare one end of each section.
  3. Install a flare nut on each section. Connect each of the above sections of tubing into the “flare nut-to-flare nut adapters” that are included in the J-29658-82 Gage Adapters.
  4. Attach the pipe and adapter assemblies to the J-29658 gage.
  5. Using proper procedures, raise and support the front of the car.
  6. Disconnect the front fuel feed hose from the fuel pipe on the body.
  7. Install the 10 in. (254 mm) length of 3 ⁄ 8 in. fuel hose onto the fuel feed pipe on the body. Attach the other end of the hose onto one of the sections of pipe mentioned earlier. Secure the hose connections with clamps.
  8. Attach the front fuel feed hose onto the other section of tubing. Secure the hose connection with a clamp.
  9. Start the engine and check for leaks.
  10. Observe the fuel pressure reading. It should be 9–13 psi (62–90 kPa).

Replace headlight bulb 2011 Buick Enclave

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Jan 252018

Buick Enclave

I need a bulb put in the right front head light I was told. Will replacing this bulb, also work low and high beam? I was also told it is a little difficult to replace this bulb. Can you tell me how much the bulb should be and how much should the total cost to replace this bulb?

Replace headlight bulb

High beam and low beam headlight bulbs are separate. Labor time is 0.8 – 1 hour to replace headlight bulb. So you are looking at around $200 for parts, labor and tax.

OEM Factory Replacement HID Bulb – $69.00 w/free shipping

Shop Automotive

Technical Info

The headlamp relay receives battery positive voltage directly from the battery. The BCM supplies a ground signal to the headlamp relay for normal headlight operation. The BCM also supplies voltage to the beam select relay coil for high beam headlight operation. When the driver places the headlamp switch in the ON position and the dimmer switch is in the low beam position, the headlamp relay supplies current flow through the left and right low beam headlamp fuses to both low and high beam headlamps. Both low beam headlights are grounded through the beam select relay. When activated, the dimmer switch sends a ground signal to the BCM in the high beam position and a momentary ground signal in the flash-to-pass (FTP) position. The BCM then energizes the beam select relay which switches the headlamp grounds from the low beam headlight bulbs to the high beam headlight bulbs illuminating the high beam headlights. With the headlights in the low beam position, the high beams may be momentarily turned ON or flashed by activating the FTP portion of the switch.

When To Change The HID Bulb

Bulb failure, end of life occurs when the bulb gets old and becomes unstable. The bulb may begin shutting itself off sporadically and unpredictably at first, perhaps only once during a 24-hour period. When the bulb begins shutting itself off occasionally, the ballast will automatically turn the bulb back on again within 0.5 seconds. The ballast will re-strike the bulb so quickly that the bulb may not appear to have shut off. As the bulb ages, the bulb may begin to shut off more frequently, eventually over 30 times per minute. When the bulb begins to shut off more frequently, the ballast receives excessive, repetitive current input . Repetitive and excessive restarts or re-strikes, without time for the ballast to cool down, will permanently damage the ballast. As a safeguard, when repetitive re-strikes are detected, the ballast will not attempt to re-strike the lamp. The ballast then shuts down and the bulb goes out.

The following symptoms are noticeable signs of bulb failure:

  • Flickering light, caused in the early stages of bulb failure.
  • Lights go out, caused when the ballast detects excessive, repetitive bulb re-strike.
  • Color change—The lamp may change to a dim pink glow.

Input power to the ballast must be terminated in order to reset the ballast’s fault circuitry. In order to terminate the input power to the ballast, turn the lights off and back on again. Turning the lights off and back on again resets all of the fault circuitry within the ballast until the next occurrence of excessive, repetitive bulb re-strikes. When excessive, repetitive bulb re-strikes occur, replace the starter/arc tube assembly. The ballast will begin the start-up process when the starter/arc tube assembly is replaced. Repeatedly resetting the input power can overheat the internal components and cause permanent damage to the ballast. Allow a few minutes of cool-down time in between reset attempts.

Bulb failures are often sporadic at first, and difficult to repeat. Technicians can identify bulb failure by observing if the problem gets progressively worse over the next 100 hours of operation.

Light Color

White light has a different color rating than regular headlamps. The range of white light that is acceptable is broad when compared to halogens. Therefore, some variation in headlight coloring between the right and left headlamp will be normal. One high intensity discharge (HID) at the end of the normal range may appear considerably different in color from one at the other end of the range. Difference in color is normal. Replace the arc tube only if the arc tube is determined to be at the bulb failure stage.