How does a diesel engine utilize engine braking if there is no throttle body to control air intake like in a gas engine?
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Modern diesel engines have a lot of things in the exhaust system to reduce emissions (turbochargers, exhaust gas recirculators, particle filters etc) which restrict the flow of gas through the exhaust and creates back pressure which adds some engine breaking effects.
Some engines also have an exhaust value to restrict exhaust flow to add more engine breaking, or jake breaks as another poster says.
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