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White Smoke out the tail pipe. enough to fill the wal-mart parking lot

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Offline v-stone

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White Smoke out the tail pipe. enough to fill the wal-mart parking lot
« on: November 03, 2007, 11:36:07 PM »
My 93 sidekick has been running with a high idle for a couple months now. We took it to the local shop and the guy said it was a bad idle air control vavle, wouldn't hurt the engine if left alone. I replaced it with one from the junk yard and no change. Now its blowing white smoke out the back like crazy. I did a compression test and all 4 cylinders are 170psi. plugs are fairly sooty and coolant bubbling. I tried running sodium silicate threw the cooling system but didn't seem to help. I don't know what wrong or what to do. Help!
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Offline Gary_Hill

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Re: White Smoke out the tail pipe. enough to fill the wal-mart parking lot
« Reply #1 on: November 04, 2007, 01:57:19 AM »
Sorry to tell you , but you have a blown head gasket which will boil the coolant and cause clowds of white smoke when you take off. The sooty plugs indicate you were running fuel rich.

Get a manuel at the local auto store and replace the head gasket. You can do it...
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xjames

Re: White Smoke out the tail pipe. enough to fill the wal-mart parking lot
« Reply #2 on: November 04, 2007, 07:48:54 AM »
Absolutely, water vapor running through your exhaust will make O2 sensor read lean forcing the comp to increase fuel making mixture rich. After replacing the head gasket I would reset the computer and maybe replace the O2. The glycol in antifreeze will gum up the O2 pretty bad of course it will eventually burn off, just takes awhile.
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Offline v-stone

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Re: White Smoke out the tail pipe. enough to fill the wal-mart parking lot
« Reply #3 on: November 04, 2007, 09:00:12 PM »
would I have that high of psi with a blown head gasket?

How do I reset the computer?

Thanks for the help
« Last Edit: November 04, 2007, 09:06:43 PM by v-stone »
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Offline Rhinoman

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Re: White Smoke out the tail pipe. enough to fill the wal-mart parking lot
« Reply #4 on: November 05, 2007, 04:46:52 AM »
It sounds like a head gasket, compression readings are OK though. It could be a bad intake gasket allowing coolant into the system. Is there any sign of coolant in the oil? any sludge under the oil filler cap?
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xjames

Re: White Smoke out the tail pipe. enough to fill the wal-mart parking lot
« Reply #5 on: November 05, 2007, 05:24:41 AM »
Alot of head gaskets leak while the engine is cool. When your engine is hot it expands sealing the gap and contracts when it is cool causing a small leak. This is usually what causes a gasket to go bad. That is why you must retorque the heads after you run the engine and let it cool. It is possible that the intake is leaking, I am not familiar with zuk engines yet and wasn't sure if the intake had water passages. You will have to replace those to get to the head gasket, and changing the head gasket is still good insurance. By replacing head and intake gaskets you should be guaranteed to stop the leak regardless of its origin. When you pull the intake you can look into intake runner and see corrosion in the valve area if it is the intake.
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Offline ROSS

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Re: White Smoke out the tail pipe. enough to fill the wal-mart parking lot
« Reply #6 on: November 05, 2007, 08:16:43 PM »
i had an intake gasket go on me. it then took out the head gasket.  and yes the intake has water ports
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