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  #1  
Old June 4th, 2016, 09:31 PM
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200tdi smoke question

Sorry if it's been asked before.. I couldn't find the answer to it.

I'm getting some black smoke if I press the skinny pedal all at once or accelerate rapidly, if I back out a tiny bit and hold it there then the smoke is gone. It only seems to smoke as its under load/accelerating.

Thanks!
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  #2  
Old June 4th, 2016, 09:36 PM
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Overfueling. You can back off the fuel screw at the back of the IP a 1/4 turn (counterclockwise) and it should help.
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  #3  
Old June 4th, 2016, 09:41 PM
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It's called "Rollin' Coal"
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  #4  
Old June 4th, 2016, 10:05 PM
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Quote:
Originally Posted by javelinadave View Post
Overfueling. You can back off the fuel screw at the back of the IP a 1/4 turn (counterclockwise) and it should help.
Thanks! I'll give it a shot, it's not much smoke but rather not have any if possible.

My dads actually rolls coal... And feels sluggish.. Need to figure that one out too.. Compression is excellent though so I'm guessing the IP has been messed with quite a bit...
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Old June 4th, 2016, 11:18 PM
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As you dial it back you will see a few things:
1) Lower EGT
2) Less smoke
3) Decrease in performance

It all depends on how much you dial it back. Keep track of what you do because one day you may want to undo it but you don't want to go to far the other way.
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Old June 4th, 2016, 11:44 PM
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Does the 200 have an aneroid on top of the IP ?
If so the pressure spring inside could be getting weak just from age.

The one in my '85 BMW524td did and a German fellow sent me the trick to getting rid of the black smoke by tightening it up 1 full turn. This changes the engagement of the cone to later without reducing the fuel like Dave suggests in post #2 above.
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Old June 4th, 2016, 11:54 PM
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Same Bosch VE pump on the 200Tdi and the 300Tdi.
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  #8  
Old June 5th, 2016, 12:20 AM
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Can I buy a new spring and replace it instead of adjusting the old one?
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Old June 5th, 2016, 06:27 AM
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On the subject of 200tdi smoke. What about white smoke not during acceleration, during steady speeds. I have white smoke on cruise and black under acceleration. Same cause? Too much fuel? Same adjustment?
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Old June 5th, 2016, 09:44 AM
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Quote:
Originally Posted by javelinadave View Post
As you dial it back you will see a few things:
1) Lower EGT
2) Less smoke
3) Decrease in performance

It all depends on how much you dial it back. Keep track of what you do because one day you may want to undo it but you don't want to go to far the other way.
All true. I use paint pens to mark starting points.

------ Follow up post added June 5th, 2016 09:45 AM ------

Quote:
Originally Posted by BlackField View Post
On the subject of 200tdi smoke. What about white smoke not during acceleration, during steady speeds. I have white smoke on cruise and black under acceleration. Same cause? Too much fuel? Same adjustment?
timing is off
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  #11  
Old June 5th, 2016, 10:35 AM
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White smoke is unburned fuel. Cuases are retarded timing, bad spray pattern or low compression.

Black smoke is fully burned, but excess fuel. This is fine, but you need to watch EGTs do not get too high.
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  #12  
Old June 5th, 2016, 11:40 AM
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Is it fair to say the black smoke is due to an unbalanced air/fuel mixture so don't simply adjust the smoke screw without being sure the air is on par?
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Old June 5th, 2016, 11:41 AM
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But Pablo, if you can't roll coal you will lose your "Prius Repellent" and they will gather behind you like flies on road kill.
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Old June 5th, 2016, 11:51 AM
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I love rollin' coal - matter of fact I asked UD to "tune it" so I could....and for someone who owns 2 Prius (Pri I) it is still fun
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Old June 5th, 2016, 12:09 PM
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Quote:
Originally Posted by 1of40 View Post
Is it fair to say the black smoke is due to an unbalanced air/fuel mixture so don't simply adjust the smoke screw without being sure the air is on par?
Diesel don't run an air fuel ratio like a gasoline engine. The air flow is constant and you add or remove fuel for more or less power. Power will keep going up well into the black smoke range. With a turbo it is more complex as without enough fueling you can't produce boost and the air rate won't increase.
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Old June 5th, 2016, 01:53 PM
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Quote:
Originally Posted by Jonesy View Post
I love rollin' coal - matter of fact I asked UD to "tune it" so I could....and for someone who owns 2 Prius (Pri I) it is still fun
shhhhh-you and Raub need to tell people you did that.
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  #17  
Old June 5th, 2016, 01:55 PM
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Quote:
Originally Posted by Red90 View Post
Diesel don't run an air fuel ratio like a gasoline engine. The air flow is constant and you add or remove fuel for more or less power. Power will keep going up well into the black smoke range. With a turbo it is more complex as without enough fueling you can't produce boost and the air rate won't increase.
Thanks, makes sense.
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Old June 5th, 2016, 02:24 PM
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shhhhh-you and Raub need to tell people you did that.
I have no knowledge nor comment on any alleged or implied tampering or altering of any vehicle that I may or may not posses.
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Old June 5th, 2016, 02:31 PM
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I have no knowledge nor comment on any alleged or implied tampering or altering of any vehicle that I may or may not posses.
We should roll coal up the beach....oooooh......drag race in your future I see young padwan
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Old June 5th, 2016, 08:55 PM
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