Lack of Power

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Mechanical Issues:

• Incorrect valve adjustment or timing.
• Weak valve springs.
• Burned or sticking valves.
• Poor cylinder compression pressures.
• Engine brake exhaust valve stuck in closed position.
• Worn camshaft lobe.
• Intake manifold air leakage.
• Air leak at turbocharger turbine housing.
• Blocked air cleaner assembly.
• Blocked engine exhaust system.

Fuel System Issues:

• Bad fuel or no fuel.
• Bad fuel transfer pump.
• Blocked fuel lines.
• Incorrect fuel injection pump timing.
• Bad fuel injectors or pump or pump relief valve. Injection Pump Failure.
• Bad or incorrectly adjusted accelerator cable.
• Dirty air cleaner.

Other Issues for Poor Performance:

• Engine overheating.  Transmission failure.
• Incorrect rear axle ratio.  How to find your rear axle ratio (video).
• Slipping clutch.
• Oversized tires, underinflated or overinflated tires. Proper Tire Care.
• Lack of oil or coolant.