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Category: Oldsmobile
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Experience:  30 years experience
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Oldsmobile Alero How do I change the spark plugs on a 2004

Customer Question

How do I change the spark plugs on a 2004 Olds Alero 3.4 L 6 cyl.??
Submitted: 5 years ago.
Category: Oldsmobile
Expert:  Olds expert replied 5 years ago.
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Service and Repair



NOTE: Observe the following service precautions:

  • Allow the engine to cool before removing the spark plugs. Attempting to remove spark plugs from a hot engine can cause the spark plugs to seize. This can damage the cylinder head threads.
  • Clean the spark plug recess area before removing the spark plug. Failure to do so can result in engine damage due to dirt or foreign material entering the cylinder head, or in contamination of the cylinder head threads. Contaminated threads may prevent proper seating of the new spark plug.
  • Use only the spark plugs specified for use in the vehicle. Do not install spark plugs that are either hotter or colder than those specified for the vehicle. Installing spark plugs of another type can severely damage the engine.

  1. Turn OFF the ignition.
  2. If you are replacing the engine right bank (rear) spark plugs, perform the following steps:
2.1.Remove the windshield wiper module cover.
2.2.Rotate the engine for service access.
  1. Remove the spark plug wires from the spark plugs.
  2. Remove the spark plugs from the engine.


NOTE: It is important to check the gap of all new and reconditioned spark plugs before installation. Pre-set gaps may have changed during handling. Use a round wire feeler gauge to be sure of an accurate check, particularly on used plugs. Installing plugs with the wrong gap can cause poor engine performance and may even damage the engine.

  1. Gap the spark plugs to the specifications. Refer to Ignition System Specifications.


  • Be sure plug threads smoothly into cylinder head and is fully seated. Use a thread chaser if necessary to clean threads in cylinder head. Cross-threading or failing to fully seat spark plug can cause overheating of plug, exhaust blow-by, or thread damage. Follow the recommended torque specifications carefully. Over or under-tightening can also cause severe damage to engine or spark plug.
  • Refer to Fastener Notice in Service Precautions.
  1. Install the spark plugs to the engine.

Tighten the spark plugs to 15 N.m (11 lb ft).

  1. Install the spark plug wires to the spark plugs.
  2. If you are replacing the engine right bank (rear) spark plugs, perform the following steps:
4.1.Return the engine to the proper position.
4.2.Install the windshield wiper module cover.