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post #1 of 4 (permalink) Old 05-14-09, 06:16 PM Thread Starter
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Smoking 4.6

2001 Expedition runs really good but when stomp on the gas it smokes some of the time. Lots of white smoke.

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post #2 of 4 (permalink) Old 05-14-09, 06:29 PM
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Re: Smoking 4.6

Sounds like coolant is getting into the combustion chambers.


Head gasket maybe?


Anyone like to verify this?
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post #3 of 4 (permalink) Old 05-14-09, 06:53 PM Thread Starter
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Re: Smoking 4.6

yea, I think so but what I dont understand is that it does not do it all of the time and the engine has plenty of power. I was just thinking about any way possible that the intake could have leaked water into the intake port. It has an aluminum intake.
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post #4 of 4 (permalink) Old 05-16-09, 07:04 PM
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Re: Smoking 4.6

Are you losing & adding coolant to the reservoir? Do you put the pedal to the floor regularly? Or is this a 'new' thing? If it's a new thing, I'd say it's normal as the engine probably hasn't been that high in the rev range. If you keep it up, it should subside.

If fluid levels are holding fine, then I suggest running a good product, such as SeaFoam through a vacuum line (brake booster works best) to help get rid of any built up carbon on the valves. Fuel injector and carb cleaners if you add them to the fuel tank, probably won't help if the build up is rather thick. Running seafoam, and then starting the vehicle after 15minutes will produce LOTS of white smoke from the exhaust. It's normal and will eventually subside. With any luck, after 100miles of driving the engine should no longer 'smoke' when you put the pedal down.

WORST case is a bad head gasket, or a leak into the intake. Still, if the coolant level is holding steady, I wouldn't worry too much.

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