1997 Mercury Marquis Knocking sound on valve cover

1997 MERCURY MARQUIS
148,000 MILES
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RUBEN541
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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
Aug 25, 2013 at 6:35 PM
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JACOBANDNICKOLAS
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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?
Aug 25, 2013 at 7:48 PM
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RUBEN541
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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
Mar 13, 2014 at 7:25 PM
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JACOBANDNICKOLAS
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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?
Mar 14, 2014 at 8:41 AM
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RUBEN541
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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
Mar 14, 2014 at 4:38 PM
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JACOBANDNICKOLAS
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Have you checked oil pressure? Have you checked for other rocker arm issues?
Mar 19, 2014 at 7:42 AM
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RUBEN541
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Yes I have oil pressure and the rocker arms are ok I took off the driver side valve cover because that's the side I heard the ticking noise then I turned on the engine and I noticed that there's no oil going to the top of the head
Mar 20, 2014 at 11:10 AM