12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

black smoke with no throttle

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Old Jul 24, 2010 | 01:41 PM
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12valve801's Avatar
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Default black smoke with no throttle

so i got on the freeway just a bit ago , punched it up the ramp and after i let of and it let out the usual small poof,, it started smoking for about 5 to 10 sec. not super thick but it was a lot of smoke for no throttle ... and after that i punched it again to see if it would do it again and it did,, didnt push it anymore after that,, not sure whats going on, can mechanical injectors stick open
 
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Old Jul 24, 2010 | 04:17 PM
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check your intercooler boots see if one is blown off does it run ok or like a dog?
 
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Old Jul 24, 2010 | 09:48 PM
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intercooler is fine. still running fine too. still making 30 lbs of boost and it didnt do it again when i tried a few hours later , but i cant think of what could cause this to happen

Any ideas?
 
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Old Jul 25, 2010 | 12:58 AM
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check your oil and see if it is full of fuel just a idea to see if it is filling the crankcase with fuel then we can go from there
 
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Old Jul 25, 2010 | 05:19 PM
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couldnt get a good reading on the oil through the dipstick.. what would diesel in oil look like ? think i am going to pull the plug an see what comes out cause im due for an oil change anyway.

how exactly would fuel get in the crankcase anyway.. and how terrible would it be

i have been using a lot of fuel lately but i also have been driving to the university of utah hospital everyday to see my sister and it is at the top of a big hill on the side of the mountian.
 
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Old Jul 25, 2010 | 11:02 PM
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your oil is probably so thin, that might be why you can not get a good reading. dumping too much fuel in the cylinder it just washes past the piston and ends up in the crank case. this is what happened to my friends truck. new injectors corrected this problem
 
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Old Jul 26, 2010 | 10:59 PM
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I see .. but i really dont have THAT much fuel just a 100 plate is that enough to cause the problem ? also how much blow by is normal in a 12 valve with 172k

could sliding my plate to a more stock location help. i just dont have the funds for injectors right now and i dont wanna buy stocks just to buy aftermarket in a few months
 
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Old Jul 27, 2010 | 11:53 AM
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what did your rpms do when you let off the trottel? Could be a sticking rack... but it would affect how soon your rpms drop.
 
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Old Jul 27, 2010 | 04:00 PM
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didnt noticed what my rpms were at ,, was focusing on my stack and the smoke.. hasnt done it since.
 
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Old Jul 27, 2010 | 04:38 PM
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where at in utah are u im in salt lake myself?
 
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