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  #1  
Old 05-17-2011, 02:06 PM
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Start Up Smoke

Hey I know this is the wrong time of year for this, but its still gettin kinda cool at night. I have replaced GPs, GPR, UVCH, and all plugs into valve covers, all brand new battery cables, and still am getting what I feel to be excessive fuel (white) smoke at cold start up. It doesn't do this when the weather is warmer other than a quick puff when the motor is cold, and doesn't puff white at all when the motor is warm, but when it is cooler out it does. I have checked voltage to GPR and it is adequate. This condition is greatly improved if I wait for about 40 seconds to start the truck, but it shouldn't take the GPs that long to heat up. The truck runs great, no misses or anything that would lead me to believe I have low compression, and I don't have any blow by or excess crankcase pressure either, and the injectors are newer so it shouldn't be an injectors o ring leaking fuel either,so what gives??
This little problem has me totally stumped, so I am looking to you guys on here that know more about these things than I do for help.

Thanks in advance for the help!!
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Old 05-17-2011, 02:09 PM
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Also forgot to mention that when I do get the excessive smoke, if I close the EBPV using my tuner, the smoke goes away almost completely. I would guess this is because it raises the EGT about 150 degrees when it is closed which helps fuel burn??
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Old 05-17-2011, 02:21 PM
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Well there ya have it. It's probably cool enough to cause your symptoms with the ebpv open. I've often wondered why a guy can't have a manual pull wire on that thing....sorta like the good ol choke pull. Mine blows a lil whitish as well in these temps (high 30's, low 40's) but never when warmer out. I suspect that's somewhat normal in these obs diesels.
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Old 05-17-2011, 06:41 PM
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I've often wondered that also, as far as it being somewhat normal on the OBS trucks. The thing that gets me is that its just more annoying than anything, and I have a hard time leaving little neusances alone. Always have to find a reason for em. Lol!
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Old 05-20-2011, 07:52 AM
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Anyone else have any ideas?
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Old 05-20-2011, 07:55 AM
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How old are your injector O-rings?
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Old 05-20-2011, 07:59 AM
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They have about 15-20k miles on them. They were new with the new injectors.
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Old 05-20-2011, 08:19 AM
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Doh... I missed that in your original post. I wouldn't sweat it too bad, sounds like you've covered all the bases.
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Old 05-22-2011, 07:41 PM
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How many miles are on your rig? Turbo?

Mine does the same, pretty good amount of smoke on first cold startup. I've heard cases where it's the turbo seal that's letting oil through. You said the smoke is white, but if it's like mine there's a blue tinge indicating burnt oil. Which would make sense-the turbo warms up pretty quickly and the seal expands, stopping oil from leaking through and burning off, making smoke.
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Old 05-23-2011, 07:08 PM
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Rig, including motor and turbo, have 180k on them. No blue tinge that I can tell, if I wait longer for GPs to warm up it doesn't puff as much, and something else I've noticed is that on cold start up with my tuner on the "stock" setting, it doesn't do it quite as bad either, almost like my tuner is overfueling it on start up, if its not on the stock setting.

Any chance a bad/flaky ICP or IPR could cause these symtoms??
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