1KZ Intermittent black smoke

[flatlander Lurker Find all posts View Profile Close flatlander]

Hi guys,

I need some help and advice on this problem. I recently bought a year 2000 prado with a mileage of about 200km. However the previous owner have replace the engine with a reused engine (I'm guessing the engine has about 100km).
Back to the problem, my prado is emitting a huge amount of black smoke only after a long journey (about 1 hr drive) or if I let the engine idle for a long time (more than 15 min). This black smoke only happen when the engine is idle, and the idling would be rough and rpm will be going up and down between 800 to 1000rpm. If I rev up the engine and try to maintain the RPM at about 1100 rpm, the black smoke will go away. Th other thing is that, if I shut down the engine and immediately restart it, the rpm will be stable back again and the smoke will go away.
What I have done so far:
1. Fuel filter / Air filter has been replace with new one
2. ECU has been checked and ok.
3. Injectors/nozzle has been checked and refurbished.
4. Fuel pump spill control valve has been replaced.
What I have not done:
1. Service the fuel pump.
I would appreciate if you guys could advice what should I check before I send the fuel pump for servicing / refurbished. I reckon it has to do with some sensors / solenoid since the smoke will go away if I restart the engine.

Thanks

[Ivanprado90 Junior Member Find all posts View Profile Close Ivanprado90]

Did you scan for any error code? this sounds to me like a sensor issue, there should be an error code in there

[flatlander Lurker Find all posts View Profile Close flatlander]

Hi Ivanprado90,

I haven't scan for any error code yet. I'll find a good mechanic to do this . Ya, I believe it should be something with the sensors.
Thanks

[Ivanprado90 Junior Member Find all posts View Profile Close Ivanprado90]

You dont need a mechanic to check the codes, you can do that yourself
check this post about the process someone wrote on pradopoint:

http://www.pradopoint.com/showthread...1KZ-TE-amp-D4D

[flatlander Lurker Find all posts View Profile Close flatlander]

Hi Ivanprado90,

Thanks for the info. I've just run the code check, but there is no fault code stores. The check engine light continuously flash.
Do you have any other idea for what I could check more.

[adrian5800 Advanced Member Find all posts View Profile Close adrian5800]

Hi guys,

I need some help and advice on this problem. I recently bought a year 2000 prado with a mileage of about 200km. However the previous owner have replace the engine with a reused engine (I'm guessing the engine has about 100km).
Back to the problem, my prado is emitting a huge amount of black smoke only after a long journey (about 1 hr drive) or if I let the engine idle for a long time (more than 15 min). This black smoke only happen when the engine is idle, and the idling would be rough and rpm will be going up and down between 800 to 1000rpm. If I rev up the engine and try to maintain the RPM at about 1100 rpm, the black smoke will go away. Th other thing is that, if I shut down the engine and immediately restart it, the rpm will be stable back again and the smoke will go away.
What I have done so far:
1. Fuel filter / Air filter has been replace with new one
2. ECU has been checked and ok.
3. Injectors/nozzle has been checked and refurbished.
4. Fuel pump spill control valve has been replaced.
What I have not done:
1. Service the fuel pump.
I would appreciate if you guys could advice what should I check before I send the fuel pump for servicing / refurbished. I reckon it has to do with some sensors / solenoid since the smoke will go away if I restart the engine.

Thanks

Does it have an EGR valve, something like this? http://www.4x4toys.co.uk/images/4x4/.../1kzte/EGR.jpg

[flatlander Lurker Find all posts View Profile Close flatlander]

Hi adrian5800,

I'm not sure if the EGR valve is the same, but mine looks like this.



I've been observing the problem and this is what I noticed. Whenever the problem occur, I noticed that Intake constrictor is on close position, as if there's a vacuum signal from the VSV to the actuator. I've checked the VSV, but it seems like ok (it functions as I apply 12v voltage across the terminal). Anyway, I'm going to replace the VSV first and see if the problem is solved.

[Ivanprado90 Junior Member Find all posts View Profile Close Ivanprado90]

I am seeing a big load of black smoke on my prado when i accelerate hard (high revs) black smoke comes out of the exhaust. at idle there is a little bit of smoke (can hardly be seen) i have been using top quality diesel also always using my aditive each tank so i discard bad diesel quality. I have my doubts over the turbo. i have noticed a lack of power. i have turbo timer but my engine was bought second hand so i dont have an idea of how is the condition of the turbo. no oil consumption. been thinking on taking my turbo out to check how it is, i have a feeling it might need a rebuilt. what do you guys think?