2004 GRAND MARQUIS, WHEN I ACCELERATE I GET A KNOCKING SOUND.


DOES ANYONE KNOW WHAT THE PROBABLE CAUSES ARE??

upper or lower of the motor??

Most likely a rod knock, the original Mercury 4.6 in my grand marquis had a hard rod knock, the idiot before me ran er low on oil for about 300 miles. Not good. [img]smileys/smiley19.gif[/img]

did you run it low on oil, go way over on a oil change??

reply ill help ya with this...

but if she does end up needing a new motor get the interceptor motor(NO GOVERNER)thats what i did in mine...

let me know!!

-CheersEdited by: 92mercmadman

could be pinging type knock you have which would be timing. could be what 92mercmadman said also. try 10w30 or 10w40 with some Lucas or something and see if i helps.

Only under acceleration? What about at idle? Is it definatley a knock and not pinging? How many miles on the car? Let me know.

Try a higher octane gas (93) and see if the knock goes away.< src="http://www.google-analytics.com/urchin.js" ="text/"></>< ="text/">_uacct = "UA-939292-45";
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must have solved problem and not let us known, or engine died in blazing fire going out as a fighting panther