4.2 banging sound - JeepForum.com
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Unread 06-20-2010, 02:41 PM   #1
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1989 YJ Wrangler 
Join Date: Jan 2010
Location: Providence Rhode Island, Rhode Island
Posts: 57
4.2 banging sound

Well, I changed the motor mounts and tranny mounts last week. When I started it up it ran a little rough, stalling a bit while cold. I figured it ran a little rough before and I was just feeling it more because of the new mounts. So I noticed a bit of a rattle on the highway. After a couple days I started her up and the rattle has become a bang. It will run but just on the verge of stall. I took off the valve cover and all seems good. I dropped the pan and checked all the bearings. Also look good. Noticed the timing chain is a bit loose so I'll check that out, but I don't think that is it. Any ideas? I really don't know very much about diagnosing problems. I just take things apart a see what looks busted.

By the way, Noticed a while back that oil pressure runs around 60 until it gets warm. Then it runs around 40 when I am on the gas but about 5 at idle. ? Don't know if that means anything.

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