*URGENT* Please help! Having issues on a road trip
#28
You gonna eat that?
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No. When my cat clogged badly enough to cripple my top speed to around 50mph and damage both O2 sensors and my engine, I never got a CEL until I got a misfire right at the end. I've never seen a report of a clogged cat producing a CEL other than a misfire, and usually not even that. My carpet also suffered no harm, likely because I still had my heat shields in good condition. I've only seen reports of carpet melting occasionally, far less frequently than clogged cats.
#29
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I would agree but this can be a "ghost" code for a bad rear 02 sensor as well so you have to test it first to rule out a faulty converter.
http://www.easterncatalytic.com/educ...he-po42o-code/
http://www.easterncatalytic.com/educ...he-po42o-code/
#30
You gonna eat that?
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I would agree but this can be a "ghost" code for a bad rear 02 sensor as well so you have to test it first to rule out a faulty converter.
http://www.easterncatalytic.com/educ...he-po42o-code/
http://www.easterncatalytic.com/educ...he-po42o-code/
I had the code, my cat was bad, so I thought that's what it meant without giving it much thought.
I guess 2+2 is not always 4.
Last edited by BigCajun; 04-12-2014 at 06:23 PM.
#31
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Being the engine electronics work together, the code stored doesn't generally mean the definition for said code means to replace the part it is pointing you towards. There can be other issues which will trigger a code ( i.e. pinout/loose connection, short to ground,etc) that will make it look as if the part in question might be bad when its not.
#32
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The only real way for an ECU to tell if the cat is clogged is if it had a way of measuring the pressure difference between the front O2 sensor and after the 2nd cat element. Not something our ECU is monitoring, and we don't have sensors that can pick up that.
There might be a way through calculated EGTs between the two sensors, however it would require a lot of testing of good vs failed cats to determine what conditions a clog will show but no other situation does.
And yes, it is scary. It's one of the big reasons I am a proponent of going catless for the RX-8. Engine failures, sensor failures, and car fires have all happened from RX-8 cat clogs. And no, I'm not exagerating. There have been a handful of fires that burned the car to the ground. One example: https://www.rx8club.com/series-i-tro...e-help-244839/
Last edited by RIWWP; 04-12-2014 at 04:49 PM.
#34
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If sound is the only problem, the BHR midpipe is your solution. It mutes the catless volume down to almost the same level as the stock cat. Faintly louder, slightly deeper. No other midpipe can do it the way the BHR midpipe can.
#35
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^^+1
My BHR with stock muffler is only slightly louder than with the cat, & gives it a deeper tone. It sounds really sweet at WOT, not loud at all.
If you keep your 8, I highly recommend it.
I'm sure someone would gladly trade your catback exhaust if it's aftermarket for a stock one if noise is a concern.
My BHR with stock muffler is only slightly louder than with the cat, & gives it a deeper tone. It sounds really sweet at WOT, not loud at all.
If you keep your 8, I highly recommend it.
I'm sure someone would gladly trade your catback exhaust if it's aftermarket for a stock one if noise is a concern.
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