6.9L Doesn't like to start
Freshman User
Joined: Jun 2003
Posts: 26
Likes: 0
6.9L Doesn't like to start
Noted above was the comment that white smoke was unburned fuel on a diesel. Is that correct? I was under the impression that white meant oil burning and black meant unburnt fuel, or is that only for gas?
Elder User
Joined: Mar 2002
Posts: 529
Likes: 0
From: France
6.9L Doesn't like to start
Hi pwitort,
When I fire it up in the morning I always get a puff of white smoke, I believe this is normal.
When I get on it it pours out black smoke, that's all the unburned fuel it cant swallow up.Blue smoke would probably mean you're burning oil.
Magic
When I fire it up in the morning I always get a puff of white smoke, I believe this is normal.
When I get on it it pours out black smoke, that's all the unburned fuel it cant swallow up.Blue smoke would probably mean you're burning oil.
Magic
Freshman User
Joined: Jun 2003
Posts: 26
Likes: 0
6.9L Doesn't like to start
I thought the white smoke when first started up was from the oil that leaked down the valve guides overnite.
I recall that putting diesel fuel in a gas engine carburetor ( to clean the valves) produced large amounts of white smoke (unburnt fuel?)... so what does white smoke mean for a diesel...is it oil or diesel?
I recall that putting diesel fuel in a gas engine carburetor ( to clean the valves) produced large amounts of white smoke (unburnt fuel?)... so what does white smoke mean for a diesel...is it oil or diesel?
Elder User
Joined: Mar 2002
Posts: 529
Likes: 0
From: France
6.9L Doesn't like to start
It's definately diesel fuel, oil would'nt burn white.It usually happens when you first fire it up in the morning.
Unplug the wires going to the glow plugs and try to cranck it, you'll see huge clouds of white smoke pouring out, unburned diesel fuel that has gone under compression but has not fired.
Magic
Unplug the wires going to the glow plugs and try to cranck it, you'll see huge clouds of white smoke pouring out, unburned diesel fuel that has gone under compression but has not fired.
Magic
Elder User
Joined: Oct 2002
Posts: 834
Likes: 0
From: Germany
6.9L Doesn't like to start
Hi all,
I was told that unburned diesel comes as black smoke out of the pipe (the reason of huge black smoke under full throttle), white smoke comes from water or moistness and blue smoke comes from burned oil.
Jens
I was told that unburned diesel comes as black smoke out of the pipe (the reason of huge black smoke under full throttle), white smoke comes from water or moistness and blue smoke comes from burned oil.
Jens
Junior User
Joined: Aug 2003
Posts: 53
Likes: 0
6.9L Doesn't like to start
Smoke Signals
Black = incomplete combustion
Blue = unburned engine oil mixed in the exhaust, usually due to worn piston rings, cylinder liners, valve guides or other components
White = droplets of unburned liquid fuel and water vapor, occurs typically at start-up, or idle
Black = incomplete combustion
Blue = unburned engine oil mixed in the exhaust, usually due to worn piston rings, cylinder liners, valve guides or other components
White = droplets of unburned liquid fuel and water vapor, occurs typically at start-up, or idle
Posting Guru
Joined: Jan 2003
Posts: 1,162
Likes: 1
From: House Springs, MO
6.9L Doesn't like to start
White smoke can also tell you if you've got a blown head gasket or if there's cavitation going on.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
mroth2008
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
3
Jun 24, 2015 10:52 PM
Josh Garland
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
30
Nov 1, 2014 07:22 PM
poop head
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
4
Oct 20, 2004 10:18 PM
