Question about 2000 Mercury Grand Marquis

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It has water in the spark plug hole on the back left spark plug

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You have two options:
#1: (the better of the two) you can get an air compressor with a blow nozzle and blow the air out of the hole

or

#2: (this isn't as good but will still work) pull the spark plug out, put it (or a new one if you are replacing them) back in, and then start the engine up and run it at part throttle for a few minutes. the piston will push the water out and the cylinder will begin to fire eventually, but then engine won't run very well in the mean time.

Posted on Oct 06, 2009

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Posted on Jan 02, 2017

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SOURCE: water in spark plug hole

If by water you mean coolant or anti freeze then yes you probably have a head gasket out.You can remove the plugs and turn the motor over and see if water comes out of the plug holes.One other thing is if you replace the head gaskets do them both not just one head.Hope this helps.Good luck.

Posted on Jun 08, 2010

  • 326 Answers

SOURCE: the freeze plug came out

what exactly caused the freeze plug to come out if it froze hard enough to push out freeze plug then it most likely has caused other damage the only way water is coming out of plug holes is the water is entering the cylinders i suspect you either have a cracked cylinder head or a cracked cylinder wall i have seen this on one other engine were it froze and bursted the cylinder wall i reccomend removing cylinder head for further inspection

Posted on Sep 13, 2010

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what exactly caused the freeze plug to come out if it froze hard enough to push out freeze plug then it most likely has caused other damage the only way water is coming out of plug holes is the water is entering the cylinders i suspect you either have a cracked cylinder head or a cracked cylinder wall i have seen this on one other engine were it froze and bursted the cylinder wall i reccomend removing cylinder head for further inspection

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