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Old 10-28-2010, 02:41 PM
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Black smoke from exhaust.

When I am driving slowly I can see some black smoke coming out of the exhaust. At higher speeds it goes away. Te exhaust doesn't smell like diesel either. Any ideas on what this could be caused by?
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Old 10-28-2010, 02:59 PM
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lol if its not blue then you're fine its a diesel.. black smoke is partially burnt fuel. is your fuel mileage ok?
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Old 10-28-2010, 04:09 PM
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you should check your blinker fluid and re grease your muffler bearing that might help get rid of the smoke. its a diesel they smoke its called advertised hp the more they smoke the more fuel they are getting. At a lower rpm the turbo isnt doing anything so there will be noticible smoke especially if you have a chip, once the turbo spools at higher rpms it will push more air and clean out the smoke.
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Old 10-28-2010, 07:31 PM
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Do you have a chip? Do you have guages? Need more info. Could be programming if you have a chip. Could also be because of boost leaks. Guages would help confirm this with low boost and high egts. Also does it smoke at light throttle or only at heavy throttle? Light throttle would be abnormal where heavy throttle is probably normal.
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Old 10-29-2010, 03:38 AM
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It does the normal puff of smoke if I accelerate quickly.
The times I am concerned with is the low idle while just driving along in
First gear. My last 7.3 didn't do that. I don't have any gauges or chips. It is Just a stock work truck for me. Fuel mileage is around 12. Not sure if that is bad or not for an automatic dually with a 11' steel flatbed and a few truck boxes full of tools. My last truck which was a srw with 7.3 stick got 18.
I drive like a grandma and the commute to my mobsters are all suburban stop and go with stoplights and intersections, I know that is not the best for the trucks.
Any other ideas? I checked my blinker fluid, it was all full
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Old 10-29-2010, 09:53 AM
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I'd say that is probably normal you've got a lot of weight. On that truck 12 mpg is about right they way your driving. I only get 16 mixed. And 13 all city. I would check for some boost leaks though just in case. And a set of gauge should be in any truck it's always good to see what the truck us doing. I'd get some if I were you. Just in case. You should be seeing 15-18 psi stock at wot. And your trans should run around 160 but may get up higher just shut her down if it reaches 200. And the egts are a killer. You may have caused damage and not known it. These trucks can get up to 1250* in s hurry if your pulling a hill. Even stock. At that temp for any amount of time. You cookin your turbo and starting to melt valve seat into the heads.
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Old 10-29-2010, 10:19 AM
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seems about normal to me... my F350 work truck will smoke a lil with a load on it in 1st gear and it has no chip on it...

-Raul
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Old 10-29-2010, 12:02 PM
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dually flat bed here and before my mods I got 10-12mpg now after the normal stuff I get 10-17 dep. on how fast I like to go lol
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Old 10-29-2010, 01:03 PM
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generally the camshaft under the dash goes bad and the diesel smokes....

I think the secod option would be to check your reverse light sensors. If they get rusted out ive heard of this happening.


On another note sounds like maybe to much fuel at lower RPM's is your truck tuned?
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Old 10-29-2010, 09:03 PM
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hey guys quit giving him a hard time, atleast he didnt ask how to make it smoke more. and yes for the kind of weight you have there at low rpms thats normal for a deisel.
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