Chevrolet S10 engine running rich due to fuel leak in intake manifold on Chevrolet S10

Some Chevrolet S10 owners report experiencing issues with their engine running rich due to a fuel leak in the intake manifold, which can lead to poor fuel economy as the engine burns more fuel than necessary. This problem may trigger diagnostic trouble codes such as P0172 or P0175, indicating a rich condition on one or both banks. Owners are advised to test for leaks in the intake manifold gasket and check fuel pressure to properly diagnose the issue. Repairing a rich-running engine often requires checking for vacuum leaks and addressing any leaks found. If left unresolved, driving with a faulty intake manifold can result in an imbalanced air-fuel mixture, potentially causing engine damage. Additionally, the average cost for replacing the intake manifold gasket on a Chevrolet S10 Blazer ranges from $670 to $744, making it important to address the issue promptly to prevent further damage and restore engine functionality.