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Old 11-03-2008, 05:58 PM   #1
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bright red catalytic converter

tonight i was coming home as normal, i was kinda gettin into it a little, but nothing extreme. my EGT gauge was reading normal, nothing out of the ordinary happening, when all the sudden i lost all power and couldnt accelerate, the CEL started flashing, and i coasted to a stop (luckily at my house) and the car wouldnt restart. so one i get out i notice a bright red glow from underneath the car. only to see that its my converter. what the hell does this mean for me? and yes, im going to double post at SC too here are some pics
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Old 11-03-2008, 05:59 PM   #2
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your egt was reading normal? thats weird, no idea whats going on sorry, must look pretty cool though
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Old 11-03-2008, 06:00 PM   #3
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Looks like a UFO picture.
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Old 11-03-2008, 06:02 PM   #4
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Your cat is clogged.

A chunk of catalyst came loose inside, and is blocking exhaust flow.

Try tapping on it with something, I bet it rattles.



Time for a new one.
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Old 11-03-2008, 07:15 PM   #5
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Good reason to use a "test" pipe
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Old 11-03-2008, 07:17 PM   #6
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cut it out, hollow it out, and weld it back up
edit: actually on your 9-5 you probably need to have a catalyst for o2 sensor readings
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Old 11-03-2008, 07:21 PM   #7
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Good reason to use a "test" pipe
iv always wanted to know why they call it a test pipe, any ideas?
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Old 11-03-2008, 07:32 PM   #8
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to test how the exhaust would sound and the engine would perform without a cat in it.

just a guess
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Old 11-03-2008, 07:46 PM   #9
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what palmer said or maybe you are running WAY rich

running rich or a serious overfueling problem can cause a cherry red cat too. you'll probably notice it running like crap then tho.
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Old 11-03-2008, 08:49 PM   #10
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misfire condition will cause this, your DI probably dropped dead.
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Old 11-04-2008, 06:07 AM   #11
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Quote:
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misfire condition will cause this, your DI probably dropped dead.
i think you are spot on sir, i popped off the DP today and tried to start it, and still nothing, but it wreaked of gas, telling me that im getting no spark whatsoever, and thinking back i have noticed that my car has been taking a lot longer to start. ill be getting a new DI hopefully today and see what happens.
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Old 11-04-2008, 07:02 AM   #12
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no spark + cranking the car over to try to start it + hot cat = nice warm glow
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Old 11-04-2008, 09:31 AM   #13
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iv always wanted to know why they call it a test pipe, any ideas?
Here's my theory:


When cars had carburetors and no engine diagnostic equipment, people would install a "test-pipe" to see if the cat converter was the reason behind the poor running vehicle. They would remove the old cat, install the piece of straight pipe, and see if the car ran/ performed better.

If it did, the cat needed to be replaced. A poorly tuned carburetor will lead to the rapid destruction of a catalytic converter due to raw fuel being dumped into it.
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Old 11-04-2008, 01:08 PM   #14
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sounds like a strong theory to me

i say we go with that
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Old 11-04-2008, 01:41 PM   #15
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Ive always thought it came from fabbing up a new exhaust and test fitting it. You don't want to weld the cat to the piping before you know how its all going to fit. So you create the piping with no cat, mark it, cut and then weld the cat in.

Either seems reasonable. Both could be wrong

Also, DeLorean is right on the money, as usual, I'm sure.
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Old 11-04-2008, 01:48 PM   #16
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ill be picking up a spare DI that Ben (tweek) has tonight to use and see if that is the cause of my problem. and ill prob be buying a new DP as well to replace the cat.
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Old 11-04-2008, 01:53 PM   #17
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With the "test pipe" nomenclature, I think it is because no car is really supposed to have one. They are sold for "off road use only" and I'm guessing it could mean that it is for "testing purposes only" ie, a way to justify selling them.
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Old 11-06-2008, 02:57 PM   #18
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well i put the new DI in and my car runs good now, however, now im getting a P0420 which tells me that the cat isn't working very good anymore. time for a 3" DP
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Old 11-06-2008, 04:00 PM   #19
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Glad it's working, don't forget its a pre-recall unit too, so I have no idea how long it will last.
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can be prone to failure due to increased localized stresses in the hole penetrations
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Old 11-06-2008, 05:20 PM   #20
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Glad it's working, don't forget its a pre-recall unit too, so I have no idea how long it will last.
oh yea, i know, your extra one has the same software that mine had. i actually found a guy on ebay from sterling selling a DI but i haven't been able to get up with him to see what software version it is.
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