1991 YJ Wrangler with Engine Noise - Jeep Wrangler Forum
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Old 03-14-2011, 07:33 PM   #1
Join Date: Mar 2011
Posts: 1
1991 YJ Wrangler with Engine Noise

I have 1991 YJ Wrangler, 2.5 4 cyl with an engine noise. When the engine starts cold everything is great. Within 4 to 5 minutes I hear what sounds like a lifter noise in the front of the engine. I thought it might be the timing chain so I installed a new timing chain kit, replaced the chain, gears, etc. There's no marks on the cam, etc. After installing the timing kit same problem. When I get up to above 1500 RPMs the noise returns. Any ideas?

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Old 03-15-2011, 10:07 AM   #2
Join Date: Jan 2010
Location: Las Cruces, NM
Posts: 2,291
Could be valve train or if a lot of miles a bad main/rod bearing. I just did the rod bearings on mine and got rid of a lot of the noise but I know I have a worn wrist pin in #1.
(Sold)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights
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