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Jeep Wrangler YJ
YJ General Discussion
Help with engine sounds and rattling
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<blockquote data-quote="DOWNS" data-source="post: 439001" data-attributes="member: 21038"><p>You'll have to fix the permissions on your files I can't see them without permission.</p><p></p><p>The rattling in the exhaust could be a few different things. The muffler has a series of baffles in there. If it's an ancient muffler, the baffles may have broken loose from corrosion. </p><p></p><p>It could also be the catalytic converter. Given enough age or bad contamination from oil burning, they can break apart. I've also seen them break loose from the housing. The brick was still intact but it was "loose" in the housing and was able to rattle. It took me a while to figure that one out lol. But give the whole system a look over for loose clamps, or bolts at the manifold/header collector.</p><p></p><p>As for your engine noise. Like I mentioned above, I can't hear the videos. But 4.0s are notorious for a few different engine noises. One is lifter tick. The lifters get gummy and don't pump all the way up. This can sometimes be "fixed" by a few short interval oil changes or trying out a HDEO like Rotella T. Another is piston skirt noise or piston slap. There's nothing to fix here. If the noise is skirt wear the skirt will eventually break off from the piston but it would be 10 years down the road.</p></blockquote><p></p>
[QUOTE="DOWNS, post: 439001, member: 21038"] You'll have to fix the permissions on your files I can't see them without permission. The rattling in the exhaust could be a few different things. The muffler has a series of baffles in there. If it's an ancient muffler, the baffles may have broken loose from corrosion. It could also be the catalytic converter. Given enough age or bad contamination from oil burning, they can break apart. I've also seen them break loose from the housing. The brick was still intact but it was "loose" in the housing and was able to rattle. It took me a while to figure that one out lol. But give the whole system a look over for loose clamps, or bolts at the manifold/header collector. As for your engine noise. Like I mentioned above, I can't hear the videos. But 4.0s are notorious for a few different engine noises. One is lifter tick. The lifters get gummy and don't pump all the way up. This can sometimes be "fixed" by a few short interval oil changes or trying out a HDEO like Rotella T. Another is piston skirt noise or piston slap. There's nothing to fix here. If the noise is skirt wear the skirt will eventually break off from the piston but it would be 10 years down the road. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Help with engine sounds and rattling
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