Question about 2005 GMC Sierra 2500HD 4WD

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Duramax black smoking

Its hard to start, black smokes, clicking noise while running

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  • 11 Answers

Possible computer programing issues with fuel air mix

Posted on Jan 05, 2013

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: black smoke runs badly, fuel pressure regulator or temp sensor?

look for a vacuum leak. A large vacuum leak will do just what you described. I would listen for a leak first if you cant hear it and locate it then i would spray carb cleaner around the vacuum lines. If you have a leak it will pull the carb cleaner in and you will hear the engine rpm change.

Posted on Mar 29, 2010

  • 56 Answers

SOURCE: have 2003 duramax 6.6 .i

did engine comes on? ,,unbernburn gasses causse reduce engine performane and misfire,,,performe dianosetic procedure,,..defective .knocksensor can cause same as u obseve,

Posted on Oct 08, 2010

jturcotte
  • 8269 Answers

SOURCE: hi my name is mike

could be running rich. The fuel pressure regulator is screwed into the throttle body. Take the screws out and pull the cover off the regulator. The diaphram should be right there. Take it out and inspect for tears or holes. If any problems, replace the diaphram. The regulator DOES pass fuel back to the tank if the pressure delivered exceeds the design pressure of the regulator. If the regulator is failing low, that could happen, but I don't know how it could fail low. Please let me know if you have more questions.

Posted on Nov 26, 2010

355ttrex
  • 249 Answers

SOURCE: 1998, gmc,K2500, 5.7l, 250,000km, starts

A bad coolant temp sensor for the ECM will cause that problem ... they are cheap and easy to replace. One other possibility is a piece of carbon stuck in the EGR causing an internal vacuum leak ..
Good luck.

Posted on Apr 27, 2011

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