sounds like you've wired it up to that Exhaust Gas motor thingy - that's the only device I can think of that in on for a limited period at start up.
Always 10 seconds? Never sometimes longer or shorter depending on engine rpm (basically the exhaust air motor thingy should stop if the engine goes above 3k rpm or something - my memory is sketchy of it though).
and it's probably not even that.
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