I'm going to guess it's somewhere in or around the intake manifold. I'm afraid I can't be any more specific than that.
What year/model of Cadillac are you dealing with? You've posted in the '03-07 CTS forum, but the CTS never had the Northstar, so I'm guessing you've got something else. Would you like me to move your thread to the forum for your actual model, or would you rather I move it to the Northstar forum?
Which model of "2000 Deville" ? Base, DHS, DTS. It makes big differences in diagnosis and advice.
No such thing as an "intake manifold tuning valve" in a Northstar engine. What are you trying to do or fix ?
Here are a couple of shots of a 2000 - 2004 Northstar intake manifold. See anything familiar ?
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