Why is the engine make a knocking sound when idling not so much w u ouch the gas on 1997 Mercury Sable

There is a loud knocking sound coming from top end twards ack of motor but when you push the gas a bring the rpm it don't knock as loud

by in Pleasant Hope, MO on November 26, 2013
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1 answer 3 comments
ANSWER by , November 26, 2013
Possibly the camshaft sensor pedestal is wearing out.
COMMENT by , November 26, 2013
How would One go about testing it to see if that is what it is
COMMENT by , November 26, 2013
You can use a stethoscope if you have one, or a long screwdriver that you can out against it and put your ear to the handle. You may even be able to "feel" it moving inside if you touch it. The best way would be to have a tech check it out for you.
COMMENT by , November 26, 2013
the motor is a 3.0 but its not a dual over head so if you would be so kind as to poss send the specs on where the sensor is located i read something bout a pace that is know to breck off and thank you so much