hard tapping noise coming from passenger side of engine

2010 FORD EXPLORER
126,000 MILES • 4.0L • V6 • 4WD • AUTOMATIC
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RKIDWELLJR
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I have a sohc. It was making noises and I knew it was a timing chain cassettes. I put some Seafoam in it and about three days later a knocking started coming from the passenger side. Put it on the computer at AutoZone they said that number two cylinder was not working. I change the oil and put a quarter cup of STP in it and the noise seems to be a lifter or a broken valve. I was wondering has anybody ever experienced this and could it be caused by the timing chain?
Oct 30, 2017 at 10:29 AM
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STRAILER
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Can you please take a video of the noise so I can hear it? You can upload it to our site below. A timing chain will probably not cause the problem. It could just be a carbon deposit onto of one of the pistons this is why a video is so good.

Cheers, Ken
Oct 31, 2017 at 1:00 PM