Black smoke under load - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• Black smoke under load by gamber on 26 Sep, 2007 14:09
• I just posted some information on smoke color, now I need some assistance in troubleshooting my IDI
  First the link: http://www.vwdiesel.net/phpBB/viewtopic.php?t=10578
  
  My high KM IDI (1400 km per week!) has recently started to smoke under load.  The color is black, so I am assuming it is getting too much fuel.  Any ideas where to start here?
     - increase the boost?
     - decrease the max fuel screw?
     - decrease the enrichment?
     - is it an air leak?
  
  Thanks!
• #1 by Black Smokin' Diesel on 26 Sep, 2007 20:04
• First check the air filter to see if it's clean. Then I'd check the boost pressure to make sure it's ok. The diverter valve may be broken and dumping all the pressure out (try to block it to see if it helps).
• #2 by rob76 on 26 Sep, 2007 22:36
• Every older diesel I see on the road makes black smoke under acceleration. Ever dump truck and school bus too. Unless it's pumping out huge clouds of it I wouldn't worry too much.  But then again I'm no expert.
• #3 by Op-Ivy on 26 Sep, 2007 22:56
• Quote from: "Black Smokin' Diesel"

  First check the air filter to see if it's clean. Then I'd check the boost pressure to make sure it's ok. The diverter valve may be broken and dumping all the pressure out (try to block it to see if it helps).

  
  
  
  I second the air filter idea.
  
  Also, do you run any additives? Plugged up or worn injectors can cause unburnt fuel.
  
  
  
  
  Matt