Hi Carol,here's a link on how to replace your spark plugs.
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The spark pulgs are located in the center of the engine valve cover, underneath the large black coil assembly marked with the EcoTech logo . The coil assembly has four 10mm bolts holing it down. some have a tube slightly over the cover. These will need the support bolt at the drivers side of the cylinder head removed to get the tubing to move out of the way so the coil can be removed and then the spark plugs can be replaced. dont forget to unplug the coil assembly.
SOURCE: where is 2003 saturn ion thermostat?
FACEING the ENGINE It is At TOP RIGHT SIDE Close to Master Cylinder takes About 1 hour to Replace Have Fun its a EASY One
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Remove the feed pipe
Installation Procedure
Install the thermostat and retaining sleeve with the dimple placed into the housing slotImportant: Lubricate the O-ring with soapy water or coolant before installing the O-ring in the water pump.
SOURCE: locating spark plugs and wires on a 2004 saturn ion
http://wiki.answers.com/Q/How_do_you_change_the_spark_plugs_in_a_2003_Saturn_ION
but also do consider "rtgantner"
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SOURCE: what are the AC delco spark plug compatible with
They will work, but you will get better service out of using Saturn's brands, as far as mileage; however, I would consider plug wires with this job. and use the high temp never seize to put on the threads of the new plugs, and make sure that the engine is cold when attempting to remove these plugs since it is easy to wipe out the threads in aluminum heads.
SOURCE: 2003 Saturn Ion spark plug replacement
go to autozone.com and set up a free account. You will then have access to vehicle repair guides and can get all the info and diagrams you need, plus help with troubleshooting! Hope this helps!
SOURCE: 2003 saturn ion 1 spark plug hole is stripped
I recommend you have this repaired by a mechanic as they have special tools that can assist in making the repair. You can get what is called a Boss repair kit from Auto Zone that you can use to make the repair yourself however it's not the simplest repair and in an engine that new it is most likely aluminum which means it will be very easy to damage beyond repair if you aren't careful.
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