My 2016 Toyota LandCruiser Prado has developed engine problems
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Asked by Steven
My Landcruiser Prado 2016 diesel has developed engine problems. It can all of a sudden start emitting heavy black exhaust fumes and after a little while it stops but then moves okay. What could be the cause?
Answered by CarsGuide
16 Jan 2024There are probably hundreds of reasons for this to occur, starting with the fuel system and including (but not ending with) something to do with the electronics that control modern turbo-diesel engines. Other causes can be clogged EGR valves or faulty injectors. You need to have the vehicle scanned to see if the on-board computer has detected the fault and logged it. But don't rule out something simpler like a fault with the DPF or even a dirty air filter. Either way, black smoke suggests either a problem with the air-fuel mixture or the way it's being burned.
But don't ignore the problem as black smoke from a diesel engine can also mean it's running hot and that can lead to all sorts of problems including internal engine damage. Unlike a petrol engine which will tend to run cooler on a too-rich mixture (too much fuel, not enough air) a diesel running rich can easily run too hot.
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