Here's a general procedure. However, always consult your Buick Regal's repair manual for the precise specifications and procedures for your particular model. The information below is a guideline and may vary slightly.
Tools You'll Need:
* Timing light: Essential for accurately setting the timing.
* Socket wrench and extension: To access the distributor.
* Spark plug wrench: To remove and replace spark plugs if needed (for easier cranking).
* Rachet and sockets: For accessing various components.
* Owner's Manual or Repair Manual: Crucial for specific timing marks and specifications.
* Safety Glasses: Protect your eyes.
* Gloves: For protection.
Procedure:
1. Identify Timing Marks: Locate the timing marks on the crankshaft pulley (usually a notch or mark) and the timing pointer on the engine block. Your repair manual will show you exactly where these are located.
2. Connect the Timing Light: Clip the timing light's inductive clamp around a spark plug wire (usually #1 cylinder, but check your manual). Connect the timing light to a 12V power source.
3. Engine Preparation:
* Disconnect the negative battery cable.
* Remove the distributor cap: This gives you better access to the distributor if adjustments are needed.
* Possibly remove spark plugs - Easier to crank the engine with plugs out.
4. Position the Engine: With the engine cool, crank the engine until the timing mark on the crankshaft pulley aligns with the 0° mark (or specified degree mark in your manual) on the timing pointer. This is usually done with the ignition switch in the "ON" position. *You'll likely have to do this a few times to get it exactly right.*
5. Shine the Timing Light: With the engine idling, shine the timing light onto the crankshaft pulley. The timing mark should illuminate. The number displayed by the timing light indicates the current timing setting.
6. Adjust the Timing (if necessary): If the timing is off, you'll need to adjust it using the distributor. Loosen the distributor clamp bolt (carefully!), and rotate the distributor slightly clockwise to advance the timing or counterclockwise to retard it. *Small adjustments make a big difference*. Recheck the timing with the timing light after each small adjustment.
7. Your Manual's Specifications: Your repair manual will give you the correct base timing specification (e.g., 10 degrees BTDC - Before Top Dead Center). This is the setting the timing should be at when the engine is idling.
8. Reconnect Everything: Once the timing is set correctly, tighten the distributor clamp bolt, replace the distributor cap, reconnect the spark plug wires (if removed), and reconnect the negative battery cable.
9. Test Drive: Take the car for a test drive to ensure the timing is correct. You should experience smooth idling and acceleration. If not, you might need to recheck your work.
Important Considerations:
* Vacuum Advance: The vacuum advance on the distributor affects timing at higher engine speeds. This usually isn't adjusted when setting the base timing.
* Mechanical Advance: Some distributors have mechanical advance weights that automatically advance timing with engine speed. This is generally not adjusted unless you have a problem with it.
* Professional Help: If you're not comfortable working on your car's ignition system, it's best to take it to a qualified mechanic. Improper timing adjustment can damage your engine.
This is a complex procedure. Refer to your owner's manual or a Buick Regal repair manual specific to your year and engine for the exact specifications and procedures. Improper timing can lead to engine damage. If you're unsure about any step, consult a professional mechanic.
