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Old 02-14-2001, 08:52 AM   #1
DigDug
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Question Cats gone horribly wrong?

Well, I burned an ignition coil two days ago (seems like a pretty common occurence anymore, from searching past posts). As a result, the wires fried to the cylinders on the driver's side, and the ones on the passenger side were still firing. As you can probably imagine, this causes a violent shaking of the car when the engine is around idle speed - when it was sitting on the side of the road immediately after it happened, I was almost worried that the car was going to hop right off into the ditch next to where it was sitting!

Anyways, the first indication of what was wrong was that when I looked in the engine bay (it was night time), I noticed a strange orange glow coming from far below... I looked closer and the cats were literally glowing orange inside the heat shield! Well, I figured they were toast, and I took it to my mechanic yesterday morning. By 2PM, he had a new coil in and new wires to replace the burnt ones, and the car was running fine again. He did check the cats, and said they were okay. And a funny thing is, the car is literally pulling harder now, and doesn't make that rich-run smell at WOT, so who knows how long the coil/wires were going bad for...

But before I even got the car home, while on the road, when I revved it past around 3K, I hear this strange rattling noise coming from underneath the car (obviously in the exhaust, and more specifically, in the area of the cats). The rattling isn't the kind of deep rattle that something makes when it is hitting something (like if it were hitting the heat shield), but rather a sort of higher-pitch, "smaller" kind of rattle, but it resonates through the exhaust, and sounds kinda like lots of tiny pieces of metal are being blown down the B-pipe. I am not sure what it is. Anybody experience anything like this? Perhaps I blew the screen out of the front cat and it is rattling in the second? No check engine light, and the car is pulling just as strongly as ever...
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Old 02-14-2001, 09:58 AM   #2
M a t t
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if you the cat was glowing orange you prob melted the inside of the cat and your blowing out the peices from inside. just a guess though. Did you look inside the muffler? i'd go back to the dealer.
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Old 02-14-2001, 01:52 PM   #3
TR
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your O2 sensor(s) might be loose. jack it up, let it cool down and then see if there is any play in the sensors - should be attached to the 1st cat.
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Old 02-14-2001, 10:15 PM   #4
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I agree with Matt. You should bring your car back to the dealer. I have seen pieces of a cooked cat fly out of an exhaust before. You can try hitting your cat softly and see if you hear anything rattling inside. Don't hit too hard though.
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Old 02-15-2001, 07:28 AM   #5
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Good point, I should take it back. I just have to recover from the cost of the last visit to the dealership (I'm past the powertrain warranty now, so that ignition coil fry cost me some $$$).

I have been thinking about going to a single high-flow cat to replace the dual stock cats. Supposedly, Random has a kit for the 2.5RS, but I haven't gotten a reply back from them for a price yet... If that works out, I might just chuck these cats anyways...

I heard somewhere that the EJ25 motor, from the factory, runs so clean that it will pass emissions in most states with only the primary converter. Anybody know if that's true?
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Old 02-15-2001, 02:19 PM   #6
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DigDug: I would avoid hitting your cat. From what i hear, animal rights activists are cracking down on people hitting their cats "to check them" and people that punch out their cats "so they flow more."

If you insist on hitting your cat, i'd take it to a professional, or better yet, install a pre-punched, high flow cat. They breath easier and meow at a much lower tone.

Jason
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Old 02-15-2001, 06:26 PM   #7
P.K. Motorsports
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Digdug - it is most assuredly true.


If Subaru isn't picking up the tab I would (I hope I don't go to hell for saying this) punch 'em out (they're toast anyway, so what the heck?), and deal with the CE light whilst saving up for an MRT. The Random high-flow cat pipe is probably gonna be $300 to you. The MRT is EQUAL LENGTH HEADERS, high-flow cat, midpipe, and muffler to your door for $545 from Kyle, assuming he can get MRT to cooperate. You decide which one makes sense.
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Old 02-15-2001, 11:36 PM   #8
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Wow 300 bux for a high flow cat? You guys are luck for having a strong currency...

Hmm.. I never thought that hitting the cat was a bad thing..
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Old 02-16-2001, 07:34 AM   #9
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Hehe, good point. I think I will refrain from hitting my cat. The last thing I need right now is for the animal rights activists to gather in protest at my residence!
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Old 02-16-2001, 08:35 AM   #10
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MY cat makes a loud nise when i hit it, is this bad? only it doesn't sound like metal moving around... it's more like a grouwl and a yelp combined...
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Old 02-16-2001, 09:14 AM   #11
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Sounds like Catalitic toast to me. I have killed a great many cats. I have even launched cat chunks out of my exhaust, not on purpose of course. Funny as hell though.

Get under there and tap through the whole exhast, the chunks may migrate on ya.

Ken
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Old 02-17-2001, 12:16 AM   #12
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Whenever the cat-replacement happens, have them take off the rest of the pipe and dump it out, or suck it out, in case there are chunkies stuck somewhere. Better yet, do a cat-back at the same time.

I think we're really good at spending other people's money.
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