Does anyone know how to replace the two center spark plugs in the back of engine on a 2004 DTS???
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2004 Cadillac DeVille Question: spark plugs
Answer #1Oakman October 16, 2009, 12:59Master
Using the proper spark plug socket and the necessary adapters it is not very difficult to replace the rear spark plugs on your 2004 Cadillac DeVille. If you think the ignition coils are in your way, remove them from the ignition module and put them back when you have the spark plugs done.