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My 2006 Courier won't get up to 110km/h, it even struggles to maintain 100km/h with the pedal to the floor and usually fluctuates between 90 and 100km/h on the highway. Not sure if this is common or normal for an old ute but just doesn't seem right. It also blows a bit of smoke too.
The piece of the puzzle you've left out here is whether your Courier has a petrol or diesel engine. If it's the former, you could simply be looking at a worn out engine. These four-cylinders worked pretty hard and once they become worn, they start to blow smoke and lose power. That said, it could be something as simple as a blocked air filter element or a slack fuel pump.
If the vehicle has a diesel engine, there's a chance the intake system is choked up with black soot and oil fumes which eventually narrow the engine's breathing passages like cholesterol blocks a person's blood vessels. Suddenly, the air can't get into the engine properly and the engine loses power as a result. Again, though, it could be something completely different and apparently random such as the turbocharger's plumbing having fallen off, leaving the engine with no boost.
A word of warning, though, about driving a diesel Courier flat out everywhere. These engines were under-cooled and are notorious for overheating. Driving it with the throttle pedal on the floor is asking for problems.
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