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Old 11-22-2009, 02:29 AM   #1 (permalink)
saltlife
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White Smoke in A 6.2

I was reading some posts, and some said the black smoke was from air intake, and white smoke was from cracked heads or gaskets. but the ? is, it smokes white till she warms up and then goes away but when im hard on the throttle she will smoke in downshifting. Im almost 90% the heads are fine but i i just got this truck a month ago, and being my first Diesel, i dont know what to think about it.
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Old 11-22-2009, 08:27 PM   #2 (permalink)
smackzed
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Is the smoke white or grey like a gasser exhaust cause if it is and it's only when warming up then it could be cold firing. Smoking while under hard throttle is normal and if you have just enough fuel (not too much) it will look grey rather than black. White, really white smoke espescially if it smell a little sweet is burning coolant. definitly not good
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Old 11-22-2009, 09:40 PM   #3 (permalink)
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heads can be good with a blown gasket that "seals up" once it gets up to temp. check the fluid level over the next couple of days before and after each run. if it is sealing up it will only do it for so long before blows out all together.
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Old 11-23-2009, 04:03 PM   #4 (permalink)
saltlife
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Well its white then goes to whiteish/grey. But the guy i got the truck from ran tru duel from headers back, and man in the morning it looks like my house is on fire, with all the smoke. lol, but once warm is pretty good. but like for instance. when im in 2nd or 3rd and you race up in speed and let off the throttle real quick, white smoke wil come out pretty heavy. but i just told myself if this dies. just drop a 350 and be down with it. But i did here that the P-30 has a sweet inline 4 diesel, but cummins i think, that bolts right up.
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Old 11-23-2009, 06:39 PM   #5 (permalink)
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Do you have any bubbles in the radiator, does the upper radiator hose get hard when you start the truck up, does it use any coolant, does the exhaust smell sweet? Those are signs of a bad headgasket.

Most likely the smoke is from bad injectors, when the injectors are not spraying properly, the fuel does not get atomized properly and you don't get a complete fuel burn, that is why it is even worse at cold temps.
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Old 11-23-2009, 07:11 PM   #6 (permalink)
saltlife
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Well i just topped off the coolant so i will keep a good eye on it the next few days. im gonna have to get a youtube video of it to show. easy to show then talk about it. but i love the intel.... thank you. will try to get video tommorow......
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Old 11-23-2009, 10:01 PM   #7 (permalink)
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Partially burned diesel fuel can produce white smoke. It could be an injector issue if head gaskets are fine.
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Old 11-23-2009, 10:35 PM   #8 (permalink)
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White smoke

We had simular problem with a 93 3500. Truck ran fairly good, but enough smoke to kill mosquitoes at 100 yards. Bicyclists did not like us. We started with injecters, on advise from diesel shop. Did not fix problem, we had just bought the truck and after injecters realized the oil pan was filling up with fuel. Swapped in a new pump, thinking the front seal might be leaking into timing case. Not so quickly laddy, the problem continued, though now, darker smoke (almost a nice coal color). We pulled heads, gaskets looked correct, but saw 8 cracked pistons, 1 bad enough to see light thru it from below crank. We took two pistons out of another motor, all8 were cracked also, but put the two best in with original connecting rod bearings (real band-aid fix). Well after all this blabbing I'll get to my point if I have one. We still use this truck daily, many a time pulling 12,500 pound trailer. We live in the mountains in Quebec, and now have a little more than 30,000 miles on our first (now have four) indirect injected detroit diesel (8V47 n/a). Keep your 6.2L pull your heads and keep your head (don't throw money at it). My brother here figures I type too much good day eh.
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Old 11-24-2009, 05:55 PM   #9 (permalink)
saltlife
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Alright here is my Video of my 6.2 Cold Start.

http://www.youtube.com/watch?v=lbtLHjVWVrg
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Old 11-24-2009, 06:48 PM   #10 (permalink)
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Ah I love that sound
Looks like unburnt fuel. I'd start with injector pop testing & IP injection pressure test (pump shop usually). I didn't hear the cold advance kick in on startup.
Given that it's not white smoke at all RPMs I'd lean more towards IP than head problems....
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