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Old Feb 9, 2009 | 11:44 AM
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Raw Fuel Smoke

Another long distance repair
A friend called from SC about his 2000 excursion has raw fuel smoke after it warms up
This all started about a week ago after a what he thought was a fuel gel problem while he was in Va.Now has the whiteish blue fuel smoke
Had new CPS about 3 - 4 weeks ago
He says the smoke goes away over 2000 RPM
Only thing I can think of right now is oil temp sensor.Anymore ideas?
 
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Old Feb 9, 2009 | 12:38 PM
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Maybe just due to cold cylinders?
 
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Old Feb 9, 2009 | 12:48 PM
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If there is sufficient loss of compression in one of the cylinders raw fuel will be pumped out rather than ignited. Just a thought.
 
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Old Feb 9, 2009 | 12:53 PM
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Originally Posted by superduty4x4
Maybe just due to cold cylinders?
Sill smokes after being run a few hrs

Originally Posted by PaysonPSD
If there is sufficient loss of compression in one of the cylinders raw fuel will be pumped out rather than ignited. Just a thought.

would think there would be a noticable power loss and hard start .He says it still run good
 
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Old Feb 10, 2009 | 09:55 AM
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Update

Replaced oil temp sensor,has less smoke but still has some at less than 1400 rpm
 
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Old Feb 10, 2009 | 10:09 AM
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I would suggest that he has a cylinder contribution test ran on it to test the injectors. Sounds to me that there is a possibility that one may be dumping excessive amounts of fuel.
 
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Old Feb 10, 2009 | 10:12 AM
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Was also starting to think along those lines,can't think of much else right now
 
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Old Feb 11, 2009 | 08:52 AM
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Ok trying to find someone to do a cylinder contibution test without costing an arm and a leg
Would it be possible to unhook a bank at a time and narrow down where the culprit may be?
 
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Old Feb 11, 2009 | 02:15 PM
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I give up,marked this one down as a failure
Truck is going to a shop monday
Did find a couple unrelated problems 1-oil line at HPOP (fixed) 2- oil in ICP plug (maybe was part of cold start problem a couple weeks ago)
 
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Old Feb 11, 2009 | 02:18 PM
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I'll be interested to hear what the problem was.
 
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Old Feb 11, 2009 | 02:29 PM
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I'm bout out of ideas and 600 miles from it
 
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Old Feb 11, 2009 | 02:38 PM
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Poor mans way to check for a bad cyl.is to take a temp gun check temp on the exhaust manifold at each cyl.coolest one will be the trouble maker.

Done this on tractors before.
 
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Old Feb 18, 2009 | 10:20 AM
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Update
Turns out it wasn't fuel smoke but oil smoke.the turbo seals are gone
 
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Old Feb 18, 2009 | 10:34 AM
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I think that is better then bad rings or injectors. Glad you found the problem. Time for a rebuild.
 
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Old Feb 21, 2009 | 08:06 AM
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That will be an easy fix.
 
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