Over fueling
Senior User
Joined: Nov 2009
Posts: 230
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From: Tampa, FL
Correct me if I'm wrong but isn't white smoke due to a LACK of fuel, not too much? When you floor the throttle or add performance tunes, it will over fuel and you get black smoke. Same with a fire, add fuel = black smoke, take away fuel (ie smoldering or put water on it) = white smoke.
Now, my truck has spit white smoke a few times and each time was ultimately due to a lack of fuel. Fuel line O rings on the side of the fuel bowl were leaking not giving it enough fuel and when I first got the truck and didn't know much about diesels, had the oil run low and truck would stall from not running the injectors fully.
I would check those two, check your fuel pressure could be failing pump or clogged regulator.
Now, my truck has spit white smoke a few times and each time was ultimately due to a lack of fuel. Fuel line O rings on the side of the fuel bowl were leaking not giving it enough fuel and when I first got the truck and didn't know much about diesels, had the oil run low and truck would stall from not running the injectors fully.
I would check those two, check your fuel pressure could be failing pump or clogged regulator.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Correct me if I'm wrong but isn't white smoke due to a LACK of fuel, not too much? When you floor the throttle or add performance tunes, it will over fuel and you get black smoke. Same with a fire, add fuel = black smoke, take away fuel (ie smoldering or put water on it) = white smoke.
The black smoke is fuel that is not fully ignited or in other words not completely burned. As the rpms go up and the turbo spools adding more air, and in practicality a higher compression ratio, much higher heat is produced during compression and that same amount of fuel, or even a much greater amount, burns clean and the black smoke clears.
Like you pointed out add water white smoke - but because the fuel won't burn. It's not due too little fuel. The water will displace oxygen the fuel needs to burn.
Add fuel black smoke - but because all the fuel deesn't burn clean. You drop more fuel on and there is not enough initial heat to burn completely and it will also displace enough oxygen initially to cause a dirty burn.
Senior User
Joined: Nov 2009
Posts: 230
Likes: 0
From: Tampa, FL
Too much fuel going into the cylinder will not ignite under compression. That fuel will be expelled on the exhaust stroke as a mist that looks like white smoke. The exhaust for that cylinder will be cooler becuse the fuel did not ignite. That's why it's a good idea to use an IR temp gun to find a bad injector.
The black smoke is fuel that is not fully ignited or in other words not completely burned. As the rpms go up and the turbo spools adding more air, and in practicality a higher compression ratio, much higher heat is produced during compression and that same amount of fuel, or even a much greater amount, burns clean and the black smoke clears.
Like you pointed out add water white smoke - but because the fuel won't burn. It's not due too little fuel. The water will displace oxygen the fuel needs to burn.
Add fuel black smoke - but because all the fuel deesn't burn clean. You drop more fuel on and there is not enough initial heat to burn completely and it will also displace enough oxygen initially to cause a dirty burn.
The black smoke is fuel that is not fully ignited or in other words not completely burned. As the rpms go up and the turbo spools adding more air, and in practicality a higher compression ratio, much higher heat is produced during compression and that same amount of fuel, or even a much greater amount, burns clean and the black smoke clears.
Like you pointed out add water white smoke - but because the fuel won't burn. It's not due too little fuel. The water will displace oxygen the fuel needs to burn.
Add fuel black smoke - but because all the fuel deesn't burn clean. You drop more fuel on and there is not enough initial heat to burn completely and it will also displace enough oxygen initially to cause a dirty burn.
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