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To replace the spark plugs on a 2005 Cadillac STS V6, first, ensure the engine is cool and disconnect the negative battery cable. Remove the engine cover if necessary, then carefully detach the ignition coils by unfastening their bolts and disconnecting the electrical connectors. Unscrew the old spark plugs using a spark plug socket, and install the new plugs by hand to avoid cross-threading, then torque them to the manufacturer’s specifications. Finally, reattach the ignition coils and engine cover, and reconnect the battery.

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How do you remove spark plugs on a 2005 sts Cadillac?

To remove the spark plugs on a 2005 Cadillac STS, first, ensure the engine is cool and disconnect the negative battery cable. Remove the engine cover if necessary, then carefully disconnect the ignition coil connectors and unbolt the coils to access the spark plugs. Use a spark plug socket to carefully unscrew and remove the old spark plugs, taking care not to damage the threads in the cylinder head. Finally, replace the plugs with new ones, reassemble the ignition coils, and reconnect the battery.


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You will have to remove the intake, and replace the gaskets (they are reuse able but you should have new ones on hand in case they are damaged. The spark plugs installed in the engine are designed to last for 100k miles, unless you have a misfire, then there really no reason to replace them.


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