I've got 2000 Windstar with a 3.8L and 101,000 km.
Since new, when I put the ignition key to engine run (just before the key goes to engine start position) and the dash lights go on, I hear what sounds like a pump (priming pump???) or a motor moving to position, coming from the engine bay. I could hear it up until 2 weeks ago when I fixed the P171/174 CEL codes (replace left bank rocker cover and replace isolator bolts, etc).
Since then, I can barely hear it and it sounds like it's coming from the rear of the van, so it could even be a different pump(?).
Sorry to sound like such a noob, but does anyone know what this sound is and where I might start troubleshooting it.
I re-checked all the connections from the P171/174 fix. They all look ok.
What did I miss??
Thanks.