Internal Engine Damage Caused by Screws From Intake Manifold on Nissan Sentra

Problem Description and Possible Solution

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.

Problem Data
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Average mileage: 99,500 (60,000–139,000)
Engine affected: 2.5L 4 Cylinder
9 model years affected: 2002, 2003, 2004, 2005, more2006, 2007, 2008, 2009, 2010
12 people reported this problem
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Engine started rapidly misfiring put of the blue. Took it in. Shop replaced a dead coil, the spark plugs, and the valve cover. Blamed it all on a valve cover leak. Car starts misfiring again about 600 miles later. Bring it into the dealer, and they say the piston in cylinder 4 is cracked and none of the cylinders are maintaining correct pressure.