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Old May 27, 2009 | 09:09 PM
  #1  
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Red Cobra
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black smoke

i know its un burt fuel but i have not touched my pump at all but now when i rev it up i can black smoke it like crazy and when driving it never used to do this i do have alot of blue ish whight and now blackish on start up just wondering if anyone has any ideas as my mpg has gone down i think by about a 100k per tank
 
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Old May 27, 2009 | 09:14 PM
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Check the air filter.
 
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Old May 27, 2009 | 09:15 PM
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The cheap thing is air filter - when they clog up they don't flow as well, so truck ends up overfueling.

The more expensive thing are injectors - when they wear with use their springs weaken, causing them to open earlier and stay open for longer, thus dumping more fuel in the engine, and also dumping it a bit too early, both resulting in an incomplete burn.
 
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Old May 27, 2009 | 11:26 PM
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ya i did just put a k&n in it so i guess i may be looking into injectors.... any brand that is better?

i also noticed the truck is harder to start when cold then when i first got it .. when warm fires right up even tho on the rare time i will forget to warm the glow plugs
 
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Old May 27, 2009 | 11:33 PM
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i dont think it would be injectors because my friend has a 6.5 that the injectors are almost junk in and it starts hard weather cold or hot.

but if there just starting to go it might be injectors, it could be a valve seat going out
 
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Old May 28, 2009 | 06:39 PM
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I would pull the K&N filter out and do a test run and see if it goes away.
 
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