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 DataRepairPal Verified
Average mileage: 99,500 (60,000–139,000)
Engine affected: 2.5L 4 Cylinder
12 people reported this problem
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.