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light blue smoke

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Old May 6, 2010 | 02:04 AM
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light blue smoke

my f250 smokes at idle and when going downhill no throttle. when i run a fuel additive it goes away. when i stop using the additive it starts smoking again. im hoping its injectors. any ideas and by the way its a 93 f250 7.3 banks turbo with 240,000 miles
 
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Old May 6, 2010 | 03:26 AM
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Festus Hagen
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What color is the smoke??

Blue would be my guess, Sounds more like valve guide seals...

[edit] Guess I should read titles ... [/edit]

-Enjoy
fh : )_~
 
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Old May 6, 2010 | 01:47 PM
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Does the smoke start instantly at idle or does it start smoking after it's been idling a few minutes? when was the CDR last serviced?
 
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Old May 7, 2010 | 12:48 AM
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the smoke starts right at start up goes away unless im going down hill with no throttle. when i use fuel additive power service brand i think. it quits smoking. after a cuople of tanks without additive it starts smoking again
 
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Old May 7, 2010 | 02:42 AM
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Does it instantly start smoking every time you have to sit at a traffic light or is it clear all the time other than downhill with no throttle? Smoking from a cold start is normal, the cylinder temp isn't quite high enough to completely burn everything yet. This can be exaggerated if the outside temp is cool as well.
 
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Old May 7, 2010 | 01:02 PM
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it only smokes when i quit using fuel additive
 
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Old May 7, 2010 | 10:57 PM
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Well then don't stop using it ...

Sorry, just had to!

Start cracking injector lines one at a time and letting it run for a couple minutes with the dead cylinder to see if you find one that clears up the smoke.

-Enjoy
fh : )_~
 
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