Factors Affecting Reliability:
* Year of Manufacture: Early versions (especially those from the late 1990s and early 2000s) had more reported issues than later iterations. Dodge made several revisions over the years addressing some of the common problems.
* Maintenance: Regular and proper maintenance is crucial. Neglecting oil changes, coolant flushes, and other scheduled maintenance significantly increases the risk of premature failure.
* Driving Style: Aggressive driving and consistent high-RPM operation can put extra stress on the engine, leading to faster wear and tear.
* Specific Issues: Some common problems reported with the 4.7L include:
* Head gasket failures: This is a significant concern, especially in older engines. Symptoms include coolant leaks, overheating, and white smoke from the exhaust.
* Intake manifold problems: Cracks or leaks in the plastic intake manifold can lead to rough running and reduced power.
* Timing chain issues: While less common than some other problems, timing chain stretching or failure can cause catastrophic engine damage.
* Oil leaks: Leaks are relatively common, often stemming from valve cover gaskets or seals.
* Variable valve timing (VVT) system problems: Issues with the VVT system can lead to performance problems and reduced fuel efficiency.
Overall:
While capable of lasting a long time with proper care, the 4.7L engine isn't known for exceptional reliability compared to some other engines. Many owners have experienced significant problems, requiring costly repairs. Others have reported trouble-free operation for many years.
In short: You can find reliable 4.7L engines, but it's crucial to thoroughly inspect any used vehicle equipped with this engine, look for signs of proper maintenance, and be aware of the potential for significant repair costs. A pre-purchase inspection by a qualified mechanic is highly recommended.
