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Unread 08-03-2010, 10:55 AM   #1
roadkill
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glowing mini cats

I just noticed last night that my mini cats are glowing red. the jeep is not a DD and I was moving my M416 at the house, so in essence they were glowing from just idling, no highway driving or load on the engine. also I'm not sure if this is related but a few weeks ago I noticed my idle sometimes wants to idle high (1200) and will fall down to 900 after the ac compressor kicks on. turn the ac off and it idles high. sometimes it did this sometimes it didn't. pretty sure the cats are still good as I hear no noise or have a lack of power nor do I have any codes when I check them. 2006 LJ with 26,000 miles. where should I look first?

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Unread 08-03-2010, 10:59 AM   #2
Unlimited04
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what kinda gas mileage you getting? any major decrease?
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Unread 08-03-2010, 11:22 AM   #3
Sundowner
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Sounds like some kind of blockage, maybe...
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Unread 08-03-2010, 11:26 AM   #4
Nonya
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glowing cats = rich condition. Get it checked out soon or glowing cats will turn into ruined cats.
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Unread 08-03-2010, 12:14 PM   #5
roadkill
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Quote:
Originally Posted by Unlimited04 View Post
what kinda gas mileage you getting? any major decrease?
not a daily driver so I don't exactly know for sure as sometimes I pull my trailer other times I don't but I haven't seen any major difference or noticeable increase
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Unread 08-03-2010, 12:16 PM   #6
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Quote:
Originally Posted by Nonya View Post
glowing cats = rich condition. Get it checked out soon or glowing cats will turn into ruined cats.
x2...Its either plugged (probably not since you have noticed no decrease in power) or its coming out too rich
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Unread 08-03-2010, 12:20 PM   #7
Unlimited04
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Quote:
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not a daily driver so I don't exactly know for sure as sometimes I pull my trailer other times I don't but I haven't seen any major difference or noticeable increase
definitely running too rich...you have 8/80 emissions warranty under federal law...let the stealership figure it out.
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Unread 08-03-2010, 01:32 PM   #8
roadkill
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I thought running lean made exhaust hotter on gas and rich makes exhaust hotter on diesels
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Unread 08-03-2010, 01:33 PM   #9
Sundowner
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A rich condition might lead to combustion happening in the header...
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Unread 08-03-2010, 01:46 PM   #10
Nonya
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cats burn fuel....rich =hot lean = cool

glowing cats = too much unburnt fuel, soon to bee melted non functioning cats
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Unread 08-03-2010, 01:52 PM   #11
Nonya
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I thought running lean made exhaust hotter on gas and rich makes exhaust hotter on diesels
lean makes the cylinders overheat, rich makes the exhaust overheat because the unburnt fuel burns off in the cats. The cats can only burn off so much before they get too hot and melt.
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Unread 08-03-2010, 02:32 PM   #12
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Just a word on this-expect a long delay if you need to order one. I have one on order from Eastern Catalytic which is a direct OE replacement, 409 stainless, high flow version. From what I've learned so far, these are a 'build to order' part so there are none on the shelf. From another thread, I'm hearing dealers have a nation wide back order on them. After a month of waiting almost, a call yesterday and I was told mine is currently "being built" and should ship soon. They were waiting for some part to finish building it and it should be done soon. Hopefully-mine's in bad shape, big loss of economy, rough idle, misfires, etc.

Best of Luck,

Mike
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Unread 08-03-2010, 04:04 PM   #13
roadkill
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I replaced my OPDA and put it back by marking the placement. could I have installed it slightly off sync and this be the result?
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Unread 08-03-2010, 05:11 PM   #14
Nonya
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opda?
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Unread 08-03-2010, 09:13 PM   #15
roadkill
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opda is the oil pump drive assembly also known as the cam sensor assembly, it's what used to be the distributor

anyways I think I have the problem fixed. I also had the Edge Trailjammer on my jeep. trying to eliminate that last night I unhooked it and ran with just the throttle body it still did the same so I assumed it was not part of the problem. so today I decided to remove the TB cause I was gonna sell the Edge anyhow and went to put the stock TB back on. I think I read somewhere where a vacuum leak could cause the exhaust to glow under certain conditions and also it related how a malfunctioning IAC would be the same as a vacuum leak (more air). well I found a small piece of orange foam trapped in my IAC motor. it was from the sealing edge of a Fram air filter. checked my current filter and it looks great; I changed my oil and air filter a week ago and no longer have the old filter to check. I suspect its been trapped in that plunger for awhile now as I had to remove the air box when I did my MetalCloak fenders earlier this year and the box sits really close to the radiator supports after the tube fender install. I theorize that the lid shaved a piece of foam when I was putting it on and that piece got sucked up into the TB and found its way into the IAC motor.

so stock TB, no Edge module and a properly working IAC and now my jeep idles at roughly 725 regardless of AC function and the mini cats no longer glow. I know it was somewhat of a shotgun approach towards solving my problem but I bet the foam holding the IAC open was my problem all along and had I not removed the TB and swapped to the stock one I may never have found the foam in the IAC.
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