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crash 02-04-2006 10:10 AM

White smoke
I've got white smoke while idling or driving, makes me think head gaskets blown. Dipstick shows clean oil , no milky look, no increase in fluid level. Water in radiator looks clean. Oil filler cap has grayish color gunk on bottom.
Any other possibilities but gasket or cracked head?
What tests will narrow it down, and any easy fix? Thanks

Jake_Dragon 02-04-2006 10:12 AM

We have had the head gasket go out on two cars in two months. I feel your pain.
On one its not getting into the oil but its making it to the combustion chamber. The other we have milk shake :(

what kind of car?

Jmark 02-04-2006 10:43 AM

What kind of car and what trans? Pure white smoke is usually caused by a bad vacuum modulator sucking trans fluid into the intake. More info would help.


vfast1 02-04-2006 02:52 PM

try a compression test..also is the antifrezze bubbling in the over flow tank? or fill up while idling? the car is fully warmed when this happens right?

docvette 02-04-2006 05:04 PM

Doc here, :pimp:

If possible (Carbbed) look into the manifold, Is it reddish in color? If so you have a modulator gone south..Does the smoke smell sickly sweet?

Pull the line from the Carb going down to the Transmission, and plug the carb side..Run the car about a half an hour (in the driveway) Does the smoke dissipate? If so replace the modulator.

Also, If not that, Does the Radiator require constant topping off? Run hot or misfire at any Engine RPM? If so this would indicate a head gasket/Cracked Head/block or bad intake manifold gaskets. Blowing as much smoke as you say, It should be constantly low..and run bad.

Pull the plugs, are any Wet, with water? Crank it while watching the plug holes, do any spray water?

Do a pressure test on the radiator, does it hold pressure..

Try those and let us know

Doc :pimp:

66GMC 02-04-2006 05:06 PM

I'm fairly sure that you can have a shop do a test for the presence of combustion gases in the coolant.

Garbonzo Bojangles 02-05-2006 06:07 AM

I car does a little of this, and like yours the oil and coolant are fine. I wasn't able to diagnose the problem in time for winter, but I believe my problem is gas. Either from the cam overlap, clean heads, or junk additives, there is no mistaking that it smells like gas. I still have to retorque my new heads, so maybe there is some cylinder leakage, but I've heard the Fel-Pro blue gaskets are supposed to be okay without one. Maybe it's the crap AC Delco plugs I run, or a bad coil? Can't say for sure, but I can say when I took my phenolic spacer off the driving smoke decreased, probably due to better atomization in the Vic Jr.

And for the people who say white smoke is not gas, run a carb with no primary jets and tell me what color the smoke is...

jimfulco 02-05-2006 11:16 PM

Any chance it's just condensation in the exhaust system evaporating?

Jake_Dragon 02-15-2006 06:45 PM

Hows your car doing? I killed the motor in my car 2 days ago. We had some real cold weather and I think my thermostat stuck shut. The motor overheated while I was cleaning the ice off my window.
All the water from my motor is in the oil :(

Anyway I have another car almost ready to drive so its not too bad.

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