Screws inside the intake manifold can become loose causing internal engine damage if they fall out completely. Our technicians report that using a strong thread locker on the power valve butterfly screws can help prevent them from becoming loose. The manual transmission models reportedly do not have the intake manifold power valves.Google+
Car Problem Reports
Nissan Pathfinder Loose Screws Inside Intake Manifold Can Cause Internal Damage if They Fall Out
Nissan Pathfinder Problem
Engine Affected: Automatic Transmission
Average Mileage: 124,666 mi (78,000 mi - 188,000 mi)
Visitor, 2002 Nissan Pathfinder, 188,000 mi
replaced screws and included threadlocker on all screws. plate had fallen off and got lodged in the intake manifold. no damage to engine occured.
Visitor, 2004 Nissan Pathfinder, 78,000 mi
I heard loud engine knock that lasted a few minutes before disappearing. I removed upper intake plenum to discover 1 missing power valve and two screws. The knock I had heard was power valve screw inside cyl. before it made it's way out the exhaust. I found the loose power valve stuck in an intake runner.
Visitor, 2001 Nissan Pathfinder, 108,000 mi
hear noise in the manifold area. maybe having it check would be great!