4xcrazy
3/4 ton status
Never heard of white smoke being fuel... I'd suess coolant as well.
CK5
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88 sub smokes only after extended idle??
- Thread starter bigjohn79
- Start date
I never saw white smoke being unburned fuel either--till they started putting ethanol in gas...I think it absorbs water and releases it as steam once the fuel burns..
My friend had an older GM car come in his shop on a ramp truck--its fuel pressure regulator diaphram failed,and it flooded the engine badly...he diagnosed and fixed the problem,then changed the oil,and started the car up--had to back it outside right away,it filled the shop with a dense white steamy smoke!.
--he thought maybe it blew a head or intake gasket,but after letting it run outside a good 15 minutes,and revving it up a few times,there was a sudden "whooof" out of the exhaust,and a flame about 5 feet long came out of the muffler--then it smoked very little,and it finally stopped..all we could assume was the muffler was full of unburned fuel combined with condensation,and after awhile the water boiled off enough to let the fuel ignite...gave us quite a rush!--lucky no one was standing behind the car when it ignited!..
My friend had an older GM car come in his shop on a ramp truck--its fuel pressure regulator diaphram failed,and it flooded the engine badly...he diagnosed and fixed the problem,then changed the oil,and started the car up--had to back it outside right away,it filled the shop with a dense white steamy smoke!.
--he thought maybe it blew a head or intake gasket,but after letting it run outside a good 15 minutes,and revving it up a few times,there was a sudden "whooof" out of the exhaust,and a flame about 5 feet long came out of the muffler--then it smoked very little,and it finally stopped..all we could assume was the muffler was full of unburned fuel combined with condensation,and after awhile the water boiled off enough to let the fuel ignite...gave us quite a rush!--lucky no one was standing behind the car when it ignited!..
Unburned boiled gas is white. If you see gas spray on something hot, it turns into a white vapor.
If you are standing close to the cloud, there is no mistaking that its gas. The gas smell will almost knock you down.
The fastest way to tell what the smoke is, is to smell it.
Gas will smell like gas. Unless you are running straight water in the rad, a coolant leak will smell like antifreeze.
And oil will smell like.........Well, burning oil......
For what its worth, smoke that only shows up after idling for a while is probably almost always oil from valve guides.
But, since you only have it on one side, its a little odd. Usually both sides wear out equally.
A stopped up drainback hole on that side is quite possible. Too much oil buildup will cause even good valve guides to leak.
If you are standing close to the cloud, there is no mistaking that its gas. The gas smell will almost knock you down.
The fastest way to tell what the smoke is, is to smell it.
Gas will smell like gas. Unless you are running straight water in the rad, a coolant leak will smell like antifreeze.
And oil will smell like.........Well, burning oil......
For what its worth, smoke that only shows up after idling for a while is probably almost always oil from valve guides.
But, since you only have it on one side, its a little odd. Usually both sides wear out equally.
A stopped up drainback hole on that side is quite possible. Too much oil buildup will cause even good valve guides to leak.
I was thinking this might be the case too. I was going to pull the valve covers off and see if there was anything out of the norm. I have heard other guys say this can happen too.
WVK5
Newbie
I am new to the forum and rebuilding, I have read this thread and i think my fuel diaphragm or something is out. I get a nice white steamy smoke after a short idle, and a noticeable amount of water with it. I hope that is all, i have already replaced head and intake manifold gaskets, they were not fouled. when i pull the plugs there is a lot of fuel on them. if there is any other suggestions I would be very appreciative of them.
