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

Runs rough n smokes blue if I try n drive it cold.

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Old 11-30-2012, 08:19 PM
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Default Runs rough n smokes blue if I try n drive it cold.

Hey guys I know it's bad but one morning I left my GF's place late for school n didn't let my truck warm up for more then about a minute n I noticed anything over 1500 rpm's she runs rough n pops a lil n blows blue smoke. I'm used to VE pumps with timing advance stuff n wondered if it's nothing to for it to do that. If I let it warm up for 3-5 minutes then drive it she's fine. I's that normal?
 
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Old 11-30-2012, 10:57 PM
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Blue smoke is burning oil. One thing it could be is leaking valve seals. With the engine off, oil drips through the valve seals into the cylinder, and when you start it, it burns off.
 
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Old 11-30-2012, 11:35 PM
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Originally Posted by daveO
Blue smoke is burning oil. One thing it could be is leaking valve seals. With the engine off, oil drips through the valve seals into the cylinder, and when you start it, it burns off.
it's not oil past the valve seals. It only does it if I try driving it while cold over 1500RPMS. If I let it idle for a few minutes after sitting over night it's all fine. I did more research n it's normal.
 

Last edited by 1stgenblowingsmoke; 11-30-2012 at 11:56 PM.
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Old 12-01-2012, 09:31 PM
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Ah, ok cool! Good to hear. I missed the "over 1500" part.
 
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Old 12-02-2012, 12:55 PM
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Fair enough. buying a set of 50 horsenozzles for it for 40 bucks. I wanted 5x12 injectors from Jamie at cpp but for 40 bucks won't say no. so I'ma clean the injectors too then put em in.
 
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Old 12-02-2012, 03:08 PM
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Bluish white smoke is unburned fuel. It also has a very sharp odor that will make your eyes water if you are in it for longer than a moment.

Totally normal to have that with a cold engine. Not good to drive off with it doing that though. Let it warm up a bit longer before driving. Unburned fuel will wash the cylinders down, cause more wear, and contaminate your oil.
 
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