Car is actually a '99 Continental, but being this area is more active and the engines are similar enough, figured it was worth asking in here instead.
When it gets into the mid 30 F degree temp range, it'll pop a P0172 and is sometimes complimented with a P0175. If temps are in the upper 30's...
This question is actually for my 99' Continental, but since more here are probably changing exhausts on their Marks, figured it was better suited on this side and our engines are similar enough.
Installed Eastern Catalytic Y pipe...
Trying to figure out if the Continental from the same era (99' in my case) has an overly lazy secondary butterfly blade opening as a car-specific detune "feature" or if both cars got this across the board. I could swear my 96' Mark VIII had both open at the same time, though it's been ages.
If...
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