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Hard tapping noise coming from passenger side of engine

Tiny
RKIDWELLJR
  • MEMBER
  • 2010 FORD EXPLORER
  • 4.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 126,000 MILES
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?
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Monday, October 30th, 2017 AT 10:29 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
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
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Tuesday, October 31st, 2017 AT 1:00 PM

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