Check for a turbo and if it has one , have it replaced
SOURCE: NO POWER ON COLD START UPS AND BLACK SMOKE COMING
are you letting the igniter heat up before starting it?
SOURCE: I have a hyundai accent
has it been driven too many kilometers ?
This should not happen at this age (2006) if not driven too much. If it is under manufacturers warranty then dont wait and take it to the service center as this could happen due to the oil burn within the engine. Atleast not at idle.
SOURCE: hyundi accent diesel car starts
Happened to me, too. On Hyudai Getz 1.5 CRDi (3 cylinder). It was just jammed butterfly (air regulator) where air is entering to machine for combustion. Due to low quality diesel soot is gathering on this butterfly and finally blocks it. However, the same problem could appear if air filter is full of dirt or blocked by dirt, or if there is computer problem in sending wrong information for combustion to engine.
SOURCE: Hyundai Accent 1.5 Diesel. Intermittent problem
it sounds like a glow plug issue. perhaps a bad glow plug relay. I would think its the relay if the problem comes and goes. If it were a bad glow plug the problem would be constant. check for volts at the glow plugs next time the car acts up. If you find no volts, tap on the glow plug relay next time you turn the key on. This may cause it to activate. if so then replace relay
SOURCE: my accent crdi engine was over hauled recently but
Black smoke is from too much fuel. Possible coolant sensor problem??? You can have this tested quickly with a live data scanner from a mechanic.
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