The symptoms of a bad diesel fuel injector are increased fuel consumption and decreased miles per gallon, dirty emissions, black smoke from exhaust, change in smell of the fuel in the exhaust, misfiring and trouble starting the vehicle or even rough running or uneven idling.
Your diesel engine can produce black smoke when accelerating hard due to getting too much fuel or fuel that is not being burnt properly.
Over fueling is one of the common causes of black smoke from diesel engines and most commonly in heavy duty diesel engines.
An imbalanced air to fuel ratio or clogged fuel injectors, dirty air filters and other faulty or bad engine components such as a faulty fuel injector can cause black smoke in diesel engines when accelerating or when running.
A blocked DPF or blocked or clogged DPF filter can cause black smoke.
The DPF filter will start to form a blockage from the waste which it holds and will need to be changed eventually.
The color of smoke from a bad turbo is black smoke which can also indicate an incorrect fuel mixture or excessive fuel injection that can be related to a faulty turbo.
Having blue or gray colored smoke often means the engine has oil that is being left in and getting into the combustion chamber as a result of an oil leak into the chamber or turbo.
A bad turbo can cause black smoke or even a blocked air intake to the turbo could cause black smoke to come out the exhaust.
The bad turbo can cause black smoke on gasoline engines and even diesel engines when the fuel mixture is not correct.
Diesel itself does not burn with black smoke when it is being burnt and combusted properly in the diesel engine.
However excess carbon build up in the combustion chamber or bad fuel injectors, dirty air filter etc can cause the diesel engine to produce black or white smoke.
The carbon that builds up in the walls of the chamber of the engine prevent the diesel fuel from being burnt completely which causes the soot or carbon to be expelled through the exhaust creating black smoke.
Unburnt diesel smoke can be white smoke or even black smoke.
The black smoke is composed primarily of elemental carbon from incomplete combustion of diesel fuel and traces of engine lubricant.
A bad diesel injector can cause black smoke.
The diesel fuel injectors are responsible for delivering the diesel fuel to the combustion chamber.
If the diesel fuel injectors are not working properly, the fuel will not be delivered correctly and will not burn completely.
Black smoke in a diesel engine indicates unburnt diesel fuel that the engine is not burning properly.
The most common cause of the black smoke in a diesel engine is a result of an imbalance of the air to fuel ratio.
The imbalance of the air to fuel ration can be caused by dirty air filters, clogged fuel injections or other faulty engine components.
If you're getting a small amount of black smoke on the diesel engine exhaust it could simply be dirty injectors or a faulty injector or air or fuel filter.
Sometimes adding a detergent additive to your diesel fuel regularly.
A multifunctional treatment like Dee-Zol will clean out the deposits, reduce the amount of fuel burned incompletely, and can even extend the life of your DPF (because less soot is being produced at any one time).
In more serious cases and when you get a lot of black smoke coming from the diesel exhaust it could be a bad diesel fuel injector that could be sticking or need replaced.
The diesel fuel injectors are responsible for delivering the diesel fuel to the combustion chamber.
If the diesel fuel injectors are not working properly, the fuel will not be delivered correctly and will not burn completely.
As a result, black smoke will come out through your exhaust.
Diesel engines should not smoke.
Black or white smoke from your diesel exhaust may indicate an engine issue.
Incomplete combustion occurs and soot is formed when there is an overabundance of fuel (both diesel fuel and lube oil), insufficient residence time in the combustion zone, and/or non-availability of sufficient oxidants.
Over-fueling is the primary cause of black smoke from the exhaust of a heavy duty diesel engine.