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Old 04-15-2012, 09:19 PM   #1 (permalink)
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I just replaced 4 out of 8 spark plugs on my 99 expedition and i started the truck to it running really bad and white smoke coming from the exhaust the smoke smells like gas and my engine light is now on any suggestions on what it is? The plug for a computer to hook up and read the codes is broke so I can't just take it in
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Old 04-15-2012, 09:23 PM   #2 (permalink)
 
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Welcome to the site, im sure someone will help with the issues....
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Old 04-15-2012, 09:29 PM   #3 (permalink)
 
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Welcome. White smoke is a sign of coolant getting in the combustion chamber, usually a sign of a head gasket leak.
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Old 04-15-2012, 09:31 PM   #4 (permalink)
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but wouldn't the smoke smell sweet instead of like gas? The third spark plug i had to use a chaser on do u think it is the oil i used to lub the chaser?
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Old 04-15-2012, 09:33 PM   #5 (permalink)
 
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I would say you have a dead cylinder or two if it is running badly after plug change. If it smells like fuel you likely are not getting spark.

Are you sure all cops are plugged in??

Did you gap plugs properly? Are spark plugs firmly seated and torqued?
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Old 04-15-2012, 09:35 PM   #6 (permalink)
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i gapped them all at .054 like the book said would that cause the smoke if its off?
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Old 04-15-2012, 09:36 PM   #7 (permalink)
 
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Originally Posted by renee View Post
i gapped them all at .054 like the book said would that cause the smoke if its off?
Not if its in the ballpark...
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Blown 2000 XLT 4wd...12.61 @ 107.44mph. (481 rwhp & 577 rwtq)

http://www.youtube.com/watch?v=QW7XKRvOP0Q


Built 5.4 w/ 8.6 to 1 comp, forged manley rods & pistons, forged steel crank, comp cams 102500, trick flow heads, ported lightning supercharger assembly pullied for 14psi boost. Tuned by self via SCT pro-racers software.

Built 4R100 . Complete custom mandrel bent dual 3" stainless exhaust with high flow cats.
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Old 04-15-2012, 09:37 PM   #8 (permalink)
 
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What year expy?

Any issues prior to plug change?
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Blown 2000 XLT 4wd...12.61 @ 107.44mph. (481 rwhp & 577 rwtq)

http://www.youtube.com/watch?v=QW7XKRvOP0Q


Built 5.4 w/ 8.6 to 1 comp, forged manley rods & pistons, forged steel crank, comp cams 102500, trick flow heads, ported lightning supercharger assembly pullied for 14psi boost. Tuned by self via SCT pro-racers software.

Built 4R100 . Complete custom mandrel bent dual 3" stainless exhaust with high flow cats.
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Old 04-15-2012, 09:37 PM   #9 (permalink)
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ok i will go back thru them the truck had no problems like this before hand thank you for your help
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Old 04-15-2012, 09:39 PM   #10 (permalink)
 
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Generally white smoke is sign of coolant in combustion chamber but I am going on the basis that the vehicle was ok before the plug change.
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Blown 2000 XLT 4wd...12.61 @ 107.44mph. (481 rwhp & 577 rwtq)

http://www.youtube.com/watch?v=QW7XKRvOP0Q


Built 5.4 w/ 8.6 to 1 comp, forged manley rods & pistons, forged steel crank, comp cams 102500, trick flow heads, ported lightning supercharger assembly pullied for 14psi boost. Tuned by self via SCT pro-racers software.

Built 4R100 . Complete custom mandrel bent dual 3" stainless exhaust with high flow cats.
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