How did I pass emissions for years....with a gutted cat?
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How did I pass emissions for years....with a gutted cat?
I'm second owner, and as mentioned elsewhere, among other things at 60K I'm replacing the catalytic converter due to cat efficiency engine trouble code. And RX8's need them at around 60K pretty often anyway....I got a good deal...didn't look much more into it, and just planned to replace.
Last I got the trouble code, I reset it, and it stayed off long enough to pass emissions...came back on a few weeks later...and I've put it off since (about a year). But before that, no issues for a few years. And, it's had a factory computer reflash early on when I had it...so I don't think it could be an ECU mod?
So, I get the old converter and pipe off tonight....and....it's empty. I've been running a gutted mid-pipe with no catalytic converter actually in it (made to look stock though) without knowing it. The only other thing was the rear oxygen sensor was moved back onto the pipe about 1 foot, and the stock port was welded shut.
How did this ever pass emissions and also not throw trouble codes, for years? Would just moving back the oxy sensor be enough?
I always thought my (aftermarket) exhaust was a little louder and smellier than it should be... ...turns out, there was a reason. :p
(And, uh...since I have a new cat on it now -- how much can I sell this stock looking mid-pipe for? )
Last I got the trouble code, I reset it, and it stayed off long enough to pass emissions...came back on a few weeks later...and I've put it off since (about a year). But before that, no issues for a few years. And, it's had a factory computer reflash early on when I had it...so I don't think it could be an ECU mod?
So, I get the old converter and pipe off tonight....and....it's empty. I've been running a gutted mid-pipe with no catalytic converter actually in it (made to look stock though) without knowing it. The only other thing was the rear oxygen sensor was moved back onto the pipe about 1 foot, and the stock port was welded shut.
How did this ever pass emissions and also not throw trouble codes, for years? Would just moving back the oxy sensor be enough?
I always thought my (aftermarket) exhaust was a little louder and smellier than it should be... ...turns out, there was a reason. :p
(And, uh...since I have a new cat on it now -- how much can I sell this stock looking mid-pipe for? )
#2
Most likely they gutted the first cat. There are two.
Also a possibilty that the car was tuned with Accessport and the seller never changed it back to stock map before selling.
Are you sure it is a mid pipe?
Also a possibilty that the car was tuned with Accessport and the seller never changed it back to stock map before selling.
Are you sure it is a mid pipe?
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Well....ran a wire through the whole piece. Completely empty.
New cat and 02 is mounted, so I'm not really worried about it. Just surprised.
Anyone want a gutted cat (with an unknown condition rear 02 sensor)? :D
New cat and 02 is mounted, so I'm not really worried about it. Just surprised.
Anyone want a gutted cat (with an unknown condition rear 02 sensor)? :D
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I'm guessing you don't have sniffer emissions tests? It would have failed that for sure, but if it's just an ODB2 check, then yes, it's entirely possible. Removing the cat elements (either from the pipe, or removing the entire cat itself) is not a guarantee of throwing a "missing cat" related failure code on our cars. Quite a few people never get the CEL (without masking it either), some people get it immediately, and others get it intermittently. If it was just ODB2 emissions checks, all they do it check to make sure that there are no codes listed for the emissions system not working right, assume that it is correctly working, and give you a passing grade.
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Inside the loop in Houston, actually.... I'll PM you a pic when I get home.
I'm not 100% sure it's stock, but I think it is. Includes the two "spring bolts" from the rear end. I reused the seals that were in good shape, and the front side bolts.
I installed a new rear 02 sensor on my new cat, since it was $60....but the one on the old pipe there might be good (enough)...no idea.
I'm not 100% sure it's stock, but I think it is. Includes the two "spring bolts" from the rear end. I reused the seals that were in good shape, and the front side bolts.
I installed a new rear 02 sensor on my new cat, since it was $60....but the one on the old pipe there might be good (enough)...no idea.
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Inside the loop in Houston, actually.... I'll PM you a pic when I get home.
I'm not 100% sure it's stock, but I think it is. Includes the two "spring bolts" from the rear end. I reused the seals that were in good shape, and the front side bolts.
I installed a new rear 02 sensor on my new cat, since it was $60....but the one on the old pipe there might be good (enough)...no idea.
I'm not 100% sure it's stock, but I think it is. Includes the two "spring bolts" from the rear end. I reused the seals that were in good shape, and the front side bolts.
I installed a new rear 02 sensor on my new cat, since it was $60....but the one on the old pipe there might be good (enough)...no idea.
#8
I am in Dallas, but I can come and get it if the other guys does not get it. Let me know.
Thanks.
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Well, I got the car all back together today...and it still works! (60K mx, replaced...what feels like everything.)
Holy crap the console and footwell get hot with a real cat down there! I'd read the threads, but always thought that was overblown...I burned my finger touching the passenger seat rail bolt.
For now I'm going to hang on to the gutted mid-pipe. I might swap it back on once I get my inspection...just because of the heat, aside from...well, the car doesn't sound as nice any more either. (And I think with all the tune-up work I did, it may pass with the midpipe again too.)
I'll bug ya'll if that changes. (I drive to Dallas once a month.) Thanks again!
Holy crap the console and footwell get hot with a real cat down there! I'd read the threads, but always thought that was overblown...I burned my finger touching the passenger seat rail bolt.
For now I'm going to hang on to the gutted mid-pipe. I might swap it back on once I get my inspection...just because of the heat, aside from...well, the car doesn't sound as nice any more either. (And I think with all the tune-up work I did, it may pass with the midpipe again too.)
I'll bug ya'll if that changes. (I drive to Dallas once a month.) Thanks again!
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Well, I got the car all back together today...and it still works! (60K mx, replaced...what feels like everything.)
Holy crap the console and footwell get hot with a real cat down there! I'd read the threads, but always thought that was overblown...I burned my finger touching the passenger seat rail bolt.
For now I'm going to hang on to the gutted mid-pipe. I might swap it back on once I get my inspection...just because of the heat, aside from...well, the car doesn't sound as nice any more either. (And I think with all the tune-up work I did, it may pass with the midpipe again too.)
I'll bug ya'll if that changes. (I drive to Dallas once a month.) Thanks again!
Holy crap the console and footwell get hot with a real cat down there! I'd read the threads, but always thought that was overblown...I burned my finger touching the passenger seat rail bolt.
For now I'm going to hang on to the gutted mid-pipe. I might swap it back on once I get my inspection...just because of the heat, aside from...well, the car doesn't sound as nice any more either. (And I think with all the tune-up work I did, it may pass with the midpipe again too.)
I'll bug ya'll if that changes. (I drive to Dallas once a month.) Thanks again!
#12
My last car was a 1993 Fort Probe GT, another fun car, but getting a bit elderly. No ODB2 port, so they had to do the actual exhaust gas emission test.
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