1997 Mercury Marquis Knocking sound on valve cover

RUBEN541

MEMBER
1997 MERCURY MARQUIS
148,000 MILES

My 97 grand marquis started knocking while driving I flushed the engine and did an oil change the car kept making the knocking noise so I added an aditive to help quiet the noise but didnt help I connected the scanner and its giving me the code p0340 camshaft position sensor circuit bank 1

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JACOBANDNICKOLAS

MECHANIC
109,724 POSTS

Other than the knock, is the engine running properly? Can you tell if the knock is coming from low in the engine or another area?

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Sunday, August 25th, 2013 AT 7:48 PM

RUBEN541

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33 POSTS

I removed the valve cover and found a lifter had popped out so I replaced the lifters turned the car on but it continues to knock

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Thursday, March 13th, 2014 AT 7:25 PM

JACOBANDNICKOLAS

MECHANIC
109,724 POSTS

A tap or tick is usually a lifter. A knock is usually from a rod bearing or main bearing on the crankshaft. Does the sound change when you rev the engine or when it is under a load?

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Friday, March 14th, 2014 AT 8:41 AM

RUBEN541

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33 POSTS

Yea its a ticking noise if I drive the car u can't hear the sound but as soon as I put the car in park or rev it when its in park I can hear the ticking noise

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Friday, March 14th, 2014 AT 4:38 PM

JACOBANDNICKOLAS