Re: weired sound in engine arround 2100 rpm, pathfinder...
Take a look at Nissan Technical Service Bulletin NTB05-15b. Title = "Rattle Noise From Vias Power Valve Actuator / Intake Manifold Collector" This appears to describe your problem exactly. I have the same problem with my 2005 Xterra and I am going to try the recommended fix myself at home.
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Sounds like a problem with the power valve actuator in the intake manifold collector. I would check with a Nissan dealer first and inquire of any recalls or service bulletins. Might save ya time & money.
I am going to take a guess and say, that you check engine light is a EVAP leak and you will need new VENT CONTROL VALVE and a WATER SEPARATOR KIT, but that's just a guess. prettycommon problem on your vehicle. As far as the whoorling sound goes, those have upper timing chain problems. You are going to hear more of a whinning noise at about 2000 rpm's. Those chains are waranteed 5years or 60000 miles. Get if fixed for FREE.