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To change the spark plugs in a 2003 Trailblazer, first, ensure the engine is cool and disconnect the negative battery cable. Remove the air intake duct for better access, then locate the spark plug wires or ignition coils; disconnect them carefully. Use a spark plug socket and ratchet to unscrew the old plugs, and replace them with new ones, ensuring they are gapped correctly. Reassemble by reconnecting the ignition components and the air intake duct, then reconnect the battery.
What else can I help you with?
Are there spark plugs on a 2003 Chevy Trailblazer?
ALL gasoline engines have spark plugs. Only diesels don't have spark plugs.
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At 100,000 miles or 160,000 kilometres you change the spark plugs. www.trailvoy.com All the answers for your Envoy/Trailblazer from true enthusiasts!
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Take it to a trained professional.
