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Old 04-08-2012, 12:56 AM   #1
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down shifting smoke`

A recent 3000 mile haul my truck (with a heavy load, 9,000+ 3000 in tow)started smoking whitish blue on some long downgrades. Looks like unburnt fuel I think. The truck following got fumed out. One hill I litteraly laid down a smoke screen and my ETG was near 150 . Accelerating would restore normal ETGs and clear up the exaust right away.
My valves are at least 150k overdue for adustment, Im thinking my valves are not closing or maybe some of my injectores are weak.
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Old 04-08-2012, 11:45 AM   #2
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I'm thinking valve guides or rings are worn.
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Old 04-08-2012, 12:50 PM   #3
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Do the easy/cheap things first. Reset the valve lash, check air and fuel filters... Etc
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Old 04-08-2012, 06:53 PM   #4
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Could it have something to do with the pre-luber?

Probably not

could also be an injector leaking/dripping. They normally cause high EGT's
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Old 04-08-2012, 07:35 PM   #5
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Does the engine consume excessive lube oil?
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Old 04-08-2012, 07:41 PM   #6
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Yea I would check my fuel filter, and make sure the turbo isn't going out, might have to check the back of the turbo for oil, just some checks I would do.
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Old 04-09-2012, 11:48 AM   #7
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The fuel filter has been awhile. It can use a gallon of oil over the course of an oil change, maybe more. Been like that for some time.
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Old 04-09-2012, 11:51 AM   #8
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Quote:
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Could it have something to do with the pre-luber?

Probably not
Could be the source of some of my oil consumsion, the hoses are numbers of years old.
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Old 04-09-2012, 02:30 PM   #9
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The fuel filter has been awhile. It can use a gallon of oil over the course of an oil change, maybe more. Been like that for some time.
Check the hose from the intercooler to the intake manifold for oil. If it's wet, the turbo is leaking. If not, probably your rings are shot.
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Old 04-10-2012, 12:20 PM   #10
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With the EGTs at 150 on a long down grade it was just wet stacking (pumping unburned fuel through the engine). Other than washing down the cylinder walls a bit it doesn't hurt anything. Maybe next time try a lower gear and bring the RPM up some to keep a little heat in the engine.
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Old 04-10-2012, 06:04 PM   #11
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With the EGTs at 150 on a long down grade it was just wet stacking (pumping unburned fuel through the engine). Other than washing down the cylinder walls a bit it doesn't hurt anything. Maybe next time try a lower gear and bring the RPM up some to keep a little heat in the engine.
This is what I thought, or was hoping. My new gear vendor was not that helpful when it came to keeping high rpm's
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Old 04-11-2012, 11:55 PM   #12
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x2 on not enough heat in the engine.
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