Tools You'll Need:
* Timing light: Essential for verifying the timing.
* Socket set and wrenches: To remove and install components as necessary.
* Distributor wrench: For adjusting the distributor.
* Spark plug socket: For removing and reinstalling spark plugs (optional, but recommended for easier access).
* Shop manual: A factory service manual for your specific year and engine is highly recommended. It will give you detailed diagrams, torque specifications, and step-by-step instructions. Haynes and Chilton manuals are alternatives, but factory manuals are usually more accurate.
* Safety Glasses and Gloves: Always protect yourself.
Process (General Outline - Always consult your shop manual for precise instructions):
1. Safety First: Disconnect the negative battery cable to prevent accidental shorts or damage.
2. Locate Timing Marks: Consult your shop manual to identify the timing marks on the crankshaft pulley and the vibration damper. These marks are crucial for setting the timing accurately.
3. Find Top Dead Center (TDC): With the distributor rotor pointing toward the #1 cylinder spark plug wire (the shop manual will tell you how to identify #1), carefully turn the engine by hand (using a wrench on the crankshaft bolt) until the timing marks align. Ensure the #1 piston is at the top of its compression stroke.
4. Access the Distributor: You may need to remove some components to gain access to the distributor, depending on your specific S10 Blazer.
5. Check the Rotor Position: Verify the rotor is pointing at the #1 spark plug wire. If it's not, something might be misaligned. Consult your manual to troubleshoot.
6. Set the Initial Timing: Your shop manual will specify the correct initial timing for your engine (usually around 0 to 10 degrees before TDC, but this varies depending on the year and emissions standards). Use the timing light to check the timing. If it's off, carefully rotate the distributor to adjust it to the specified timing.
7. Reconnect Everything: Reinstall any components you removed, ensuring everything is properly secured.
8. Recheck the Timing: After everything is reassembled, start the engine and re-check the timing with the timing light. Ensure it's still within the correct range.
9. Reconnect the Battery: Once you're satisfied, reconnect the negative battery cable.
Important Considerations:
* Vacuum Advance: The vacuum advance mechanism on the distributor plays a role in timing. Make sure it is connected and functioning correctly.
* Distributor Cap and Rotor: Inspect and replace the distributor cap and rotor if they are worn or damaged.
* Spark Plugs and Wires: If the spark plugs and wires are old or worn, consider replacing them.
Warning: Improperly setting the ignition timing can damage your engine. If you're not comfortable performing this task yourself, take your vehicle to a qualified mechanic. The information above is a general guideline; always refer to your vehicle's shop manual for detailed and accurate instructions.
