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Remove the air box on the top of the motor that says Vortec 4200. Remove the bolts for the affected coil pack and lift it off. Unclip the connector and replace.

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16y ago

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Coil pack or spark plug on 2004 Chevy Trailblazer?

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To determine if a coil pack is bad on a 2004 Trailblazer, you can check for symptoms such as rough idling, misfiring, reduced engine power, or a check engine light. Using an OBD-II scanner can help identify any trouble codes related to ignition misfires. Additionally, visually inspecting the coil pack for cracks or damage and testing its resistance with a multimeter can provide further confirmation of failure. If the coil pack shows signs of malfunction and the other components are in good condition, it may need to be replaced.


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