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You set the injection pump to run rich, i.e. to inject more fuel than the engine will have the time to burn in each combustion cycle.

By allowing the fuel injector pumps to run rich the engine does not have enough time to burn all of the fuel injected. Thus the engine spits the unburnt fuel through the exhaust system.

Another way is to remove the '' Diesel Particulate Filter'' otherwise known as the DPF. you can replace the DPF with a DPF delete pipe witch replaces the honeycomb with just a straight pipe.

If you do end up doing this you wont pass inspection and your mileage will decrease like crazy. its also very dangerous and your engine could actually blow up, so unless your truck is going to be a race only vehicle then your better off the way it is.

Under heavy acceleration all diesels produce black smoke. It's a product of waste fuel being exited via the exhaust pipe and is a sign of inefficiency.

Older diesels also produce black smoke under "normal" conditions and this also a cause of unspent fuel, but mainly because of age.

But why would you want to do that? It'll up your fuel consumption, make you fail inspection, and it won't give you more power. It'll increase pollution too.

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Q: How do you make black smoke come out of a diesel?
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