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TT500 black soot on spark plug - Cars & Trucks

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Here's a look at spark plugs and the causes.

Posted on Nov 27, 2012

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Posted on Jan 02, 2017

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Spark plugs went bad after 4000 miles


The black soot is carbon from the gas usually caused by too much fuel being burnt. Incorrect fuel to air ratio. Take vehicle to service center and have set.

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Hi there.
well when you throttle up to about 2000rpm do you get blue smoke coming out the exhaust.When driving on flat road will it power up as normal with out missing or getting hot.
what colour was the old spark plugs were they black or light brown.
When you start engine and run for 3 minutes then let it idle and remove oil filler cap do you get smoke coming out.
Number 1 if yes then engine is lacking power due to piston rings worn answer rebuild engine.
Number2 spark plugs brown [good] if black soot as num1.
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miss fire can be a number of things weak spark plug damaged lead, faulty knock sensor or a problem with the injector.. clean the spark plugs check them for changes between them. there should be no real difference on them but black soot etc is a chance its over ritch. water getting in to the spark plug or a damaged rubber seal on the plug connector can also cause this problem so would check for this to. would say its the spark plug area my self.

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