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Old 11-17-2008, 05:04 PM
mxfam
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Help settle an argument

Hi folks, We have a truck in the shop that smokes white & stinks like fuel @ an idle.
The dispute is color of smoke I.E.
Does white, black,blue smoke mean oil or fuel, coolant?
What color means what?
lets get some opinions!!!
 
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Old 11-17-2008, 05:06 PM
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EDIT: nevermind.
 
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Old 11-17-2008, 05:07 PM
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Fuel is white (at start up cold)...
 
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Old 11-17-2008, 05:11 PM
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Originally Posted by mxfam View Post
Hi folks, We have a truck in the shop that smokes white & stinks like fuel @ an idle.
The dispute is color of smoke I.E.
Does white, black,blue smoke mean oil or fuel, coolant?
What color means what?
lets get some opinions!!!
My wag would be fuel ...(White)

Either the IPR is sticking or may need an EOT sensor ...
 
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Old 11-17-2008, 05:40 PM
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Blue-grey usually means oil.
 
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Old 11-17-2008, 05:53 PM
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Borrowed from dieselmann's page

Smoke analysis

<dl><dt>White smoke: </dt><dd>Caused by unburned fuel passing through the engine. Some white smoke is normal on cold start-ups.
Excessive white smoke could be an indication of inoperative glow plugs, loose injectors, low compression from worn rings or bent connecting rods, or coolant leak into the cylinders--head gasket or injector well sleeves. </dd><dt>Black smoke: </dt><dd>Caused by excessive fuel for the amount of air drawn into the cylinders. Some black smoke on hard accel or at higher altitudes is normal.
Excessive black smoke could result from restricted intake or exhaust, inoperative leaking or weak turbo, intake hose(s) leaks, leaking or worn injectors, fuel return or supply restriction, stuck Exhaust backPressure Regulator valve or solenoid. Also PCM inputs such as BARO MAP ICP or EBP sensors. </dd><dt>Blue or blue/white smoke: </dt><dd>Caused by insufficient fuel or oil consumption. Normal when engine is cold or idling for extended periods.
Excessive smoke could be caused by air in the fuel, contaminated fuel, loose or plugged injectors, worn or leaking injector o-rings, thermostat stuck open, oil consumption, or plugged crankcase depression regulator valve. Also PCM inputs such as MAP or ICP sensors.</dd></dl>
 
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Old 11-17-2008, 05:54 PM
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Excellent, Chris. I'd give you some rep, but have to spread it around.
 
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Old 11-17-2008, 06:29 PM
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I have the same smoke analysis paragraph copied to my computer as well. Helps me keep this stuff straight.
 
 


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