Maybe there is air I the system, as mentioned above or you could have a defective heater plug if it happens after could start. On Series engine it’s possible to slacken each injector feed pipe union in turn wear eye protection, effectively leaking fuel away from the injector and nothing whether that makes a difference to the engine running quality. The engine should slow each time an injector pipe is slackened if one has no effect, you know it’s not firing. But if one injector is dud, it’s time to have them all overhauled.
We don’t recommend this as a DIY check on later vehicle because of the danger from the increased fuel pressure. ECM regulated engines should be tested using diagnostic software. Possible causes of smoke, depending on the system include incorrect injector pump timing, defective injectors, EGR failure, and dad fuel. But it could be due to any of the common engine problems including bore\ ring\ valve damage, incorrect cam timing or crankcase breathing problems. Check the system without affecting the pump settings, and then consult a diesel specialist before meddling yourself.
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