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Post by jpnut on Dec 3, 2002 14:26:24 GMT -5
And I don't mean the furry kind. On my way to work yesterday, I started to hear a rattle, it's a metalic sound but not like a bearing sound. It sounds like either the honey comb in the cat has come loose or that a heat shield is rattling. I only really hear it from @800-1500 rpm. And only really when I am moving, a little if you rev the engine. Now I crawled under there a little yesterday, not too much since I was at work. I found that I still have some mud, small stones and leaves (not near the cat on top of the skid. Now I was really hoping that the snow they say were are going to get would allow me to miss work but with everything going on Thursday, that won't happen. My plan was to drop the skid, after supporting the trans, undoing the trans mount and clean off the skid and look for anything that might be interfering with the exhaust. It would also allow me to hit the cat with my hand to see if I can hear any rattle within. The one thought was that if the cat was falling apart, shouldn't I get a check engine light since it wouldn't be working properly? I hope that it is only the trans mount since I do get some vibrations thru the shifter at launch in 1st. Any input or thoughts? Jonathan
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Post by bensredyj on Dec 3, 2002 15:07:55 GMT -5
I remember when my volvo 740 cat when, it sounded like a tin can rattling, specially around those RPMs. I would think its allright till it or if it clogs, then needs to be changed, the volvo never cloged but the jeep did clog and never rattled. SO Those are my experiences. HOw about putting a brick on the accelrater to get it up in RMPs to where you hear the rattle if that would work. SOund like it maybe time for a Hi flow Cat and cat back exhaust Then the engine skid . Did ya check the tightness of the exhaust pipe from the manifold to the cat and on back? find that makes some noises.
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Post by Lyle on Dec 3, 2002 15:42:57 GMT -5
Hi Jonathan,
For what it's worth, when the baffles in my cat came loose, the rattle was most pronounced at idle, and when shutting off the engine. I never got a check engine light.
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Post by Lyle on Dec 3, 2002 17:22:36 GMT -5
Jonathan - I just re-read your post and want to make sure I understand... do you ONLY hear the noise when moving, or can you hear it at all when not moving and revving the engine?
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Post by jpnut on Dec 3, 2002 20:08:14 GMT -5
I can hear it when I rev the engine and am not moving It does not make me happy but I still have to get my butt under there and take a look. I do think that my trans mount has seen better days but I don't think that is the cause of the noise. Guess I should make a day of investigating, changing the trans oil and cleaning to top side of the skid off, I only have to take the one skid off, I don't have an engine skid I still am confused by the fact that IF it is the internals of the cat that I am not getting an O2 sensor error but I guess that I should be thankful for that. Too late and too cold to do anything tonight. Maybe tomorrow night since we are supposed to have a couple of inches of snow by then just to add to the excitement. Jonathan (now it's time to go home)
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Post by Lyle on Dec 3, 2002 20:56:22 GMT -5
I can hear it when I rev the engine and am not moving Ok, just wanted to make sure it wasn't a driveshaft joint issue. Like I mentioned, I never got any light when my cat went bad, just that irritating rattle. As to the transfer case skid, if I lay under mine, I can just reach up inside and pull stuff out. Have found all sorts of interesting things up there... big limbs, good size rocks, etc. BUT, it hasn't been so bad since I put on the engine skid. The rattles I get from there, though, are usually just stuff sliding around and rattling when I stop or take off... not at all associated with engine speed.
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Post by f250inhampton on Dec 4, 2002 1:34:19 GMT -5
Hi, When my CAT was replaced on my F250 shortly afteer I got this nasty, tinny harmonic buzz. Turned put to be my heta shield...
Solution: I got the longest worm drive Stainless Steel clamps I could find, joined them together and secured it.
Works fine last a long time!!!
Hope this helps.
Anthony
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Post by bensredyj on Dec 24, 2002 11:37:25 GMT -5
yea the universal muffler is what they will do, anyway on my wrangler they did. they cut the pipe a month or so after I replaced EVERYTHING besides the cat. THink they also dropped the skid to get to it and might have been the beginning of my problems with that part. now its in there with messy welds and funky hangers that have come lose now due to rocks. it would probalby jsut be cheaper to order a hiflow from 4wd with the same pipe diameter. Nothn a sazall wouldn't handle and a couple hours work Maybe when I go to replace my manifold pipe and stuff, I might order one if I have the cash on hand after skids though. BEN
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Post by Lyle on Dec 24, 2002 11:48:00 GMT -5
Quadratec has a "high performance" cat for your rig here. Kinda pricey, and I don't know how it would compare with the one you'd get installed at the local shop, but at least you'd know what you've got. And... as long as you're under there anyway, there's THIS! ;D
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Post by toynrnd on Dec 24, 2002 15:40:39 GMT -5
Should you put a high flow cat behind a gerbil? Maybe we should ask Dr. Doolittle?
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Post by LILREDCJ6 on Dec 24, 2002 16:14:43 GMT -5
Whatever you do dont wait to long to fix the problem. Mine started acting up befor i went on cruise. I got back and it last 1 day before it plugged the muffler. Once that happens you will be able to put you hand on the tail pipe to see how much pressure you got. NOTE: Dont do it with a hot exhaust. I could have keept my hand on mine for as long as i could take the heat. It had no pressure at all. Which is why it is now leaking oil out almost every seal in the engine. I just ook mine off and dumped out the remains and put a new muffler on for the time being until i get the money for a new one. ;D Tony
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Post by Lyle on Dec 24, 2002 16:36:57 GMT -5
Should you put a high flow cat behind a gerbil? Maybe we should ask Dr. Doolittle? It's ok if you use Exxon and "put a Tiger in your tank". ;D
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Post by bensredyj on Dec 24, 2002 16:54:08 GMT -5
hahahaaha well some say the 4cyl needs more back pressure than the 6 but think its the owners chice and if it does any good on performance in terms of more ricy. now a RICY 4cyl Jeep
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Post by Lyle on Dec 24, 2002 23:29:37 GMT -5
On the topic of mufflers, I had made up my mind that when I need to look for a muffler, I'm going to check these guys: www.spintechmufflers.com/. Their product was featured in Four Wheel Drive magazine this summer. Their muffler is very low profile (read more clearance), and apparently very strong. In the magazine article, the accompanying photo was a Jeep driving over one. After seeing Chris' muffler misfortune at Shoe Creek, I thought it might be worth taking a look at. They also have hi flow cats, at MUCH lower prices than what we've been talking about!
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Post by toynrnd on Dec 26, 2002 6:38:13 GMT -5
I wouldn't call that a muffler misfortune...I would call it efficient maintenance. Since the cat needed to be replaced, I figured I would loosen the entire system up for the muffler guy and go ahead and disconnect the pipe from the exhaust manifold. THAT is what happened!
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