Challenges:
* Steering Shaft Interference: The steering shaft and its components are directly in the way of accessing the #3 spark plug.
* Limited Space: The engine bay in these Blazers isn't exceptionally spacious.
Strategies:
1. Use a Wobble Extension: This is often the easiest solution. A wobble extension allows the spark plug socket to reach the plug at an angle, bypassing the steering shaft's interference. You'll likely need a relatively short extension (3-6 inches) to avoid excessive flex.
2. Universal Joint: Similar to a wobble extension, a universal joint allows for flexibility in the socket's approach to the plug. Combine this with a short extension if necessary.
3. Thin-Walled Spark Plug Socket: A socket with a thinner wall will give you slightly more clearance to maneuver around the steering shaft.
4. Combination of Wobble and Universal: For extreme cases, combining both a wobble extension and a universal joint might provide the necessary access.
Procedure (General):
1. Disconnect the Battery: This is crucial for safety to prevent accidental shorts.
2. Locate the Spark Plug: Identify the #3 spark plug. The firing order is usually printed on a sticker somewhere in the engine compartment (check the valve cover or under the hood).
3. Remove the Spark Plug Wire: Carefully pull the spark plug wire straight off the plug.
4. Access and Remove the Plug: Use your chosen tool (wobble extension, universal joint, or thin-walled socket) with a ratchet to carefully remove the spark plug. Go slow and steady to avoid cross-threading or stripping the plug.
5. Clean the Plug Well: Inspect the old plug for wear and tear. If you're replacing it, be sure to clean the area around the plug well before installing the new one.
6. Install the New Plug (if applicable): Hand-tighten the new plug, then use the ratchet to tighten it to the proper torque specification (check your owner's manual or an online repair database).
7. Reconnect the Spark Plug Wire: Ensure it's securely connected.
8. Reconnect the Battery: Reconnect the negative terminal first.
Important Notes:
* Torque Specification: Over-tightening a spark plug can damage the threads. Use a torque wrench to tighten it to the manufacturer's specified torque.
* Anti-Seize: Apply a small amount of anti-seize compound to the threads of the new spark plug to make removal easier in the future.
* Photography: Before you start, take pictures of the existing setup (wire routing, etc.) to help you remember how everything goes back together.
* Professional Help: If you're uncomfortable working on your vehicle, consider taking it to a qualified mechanic.
By carefully choosing the right tools and approaching the job methodically, you should be able to remove and replace the #3 spark plug. Remember safety first!
