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CEL after install of exhaust #58638 Nov 7, 12:49pm Nov 7, 12:49pm
Joined: Oct 2003
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CEL after install of exhaust
Question, I had a custom exhaust run from the header back, removing the cat and had a better res. put in. It was fine for 2 days and then the CEL came on, I reset the ECU and it was fine for another day or 2 and then came on again. Is there anything that I can do, short of removing the light bulb? I had them put the 2 02 sensors in the same place but the cat was removed so it's probably getting a real rich reading. It's really not a problem but was wondering if some had a solution. thanks in ADV. thumbsup


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Re: CEL after install of exhaust [Re: JBing] #58639 Nov 7, 12:52pm Nov 7, 12:52pm
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The removal of the Cat is your problem, those two sensors work together ... one is suppose to take the reading before the cat, the other after.

By removing the Cat, it is throwing off the ECU and you will always get a CEL now. I believe the ECU is now always confused to it goes to a pre-program a/f curve to protect the engine, it's not going to make any adjustments, so by removing the car I don't believe you are getting the gain that you hoped for.

Re: CEL after install of exhaust [Re: JBing] #58640 Nov 7, 12:53pm Nov 7, 12:53pm
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saspence22
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Would that hurt perf.???? Cutting the cat off and all?? Seems like it would lose back pressure.


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Re: CEL after install of exhaust [Re: saspence22] #58641 Nov 7, 12:54pm Nov 7, 12:54pm
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Originally Posted by saspence22
Would that hurt perf.???? Cutting the cat off and all?? Seems like it would lose back pressure.


no back pressure is great for high reving ... you will loose power on the low and midrange.

Re: CEL after install of exhaust [Re: JBing] #58642 Nov 7, 12:54pm Nov 7, 12:54pm
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ok, so just ignore the light?


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Re: CEL after install of exhaust [Re: JBing] #58643 Nov 7, 12:55pm Nov 7, 12:55pm
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I have actually notice a big improvement in the hole shot


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Re: CEL after install of exhaust [Re: JBing] #58644 Nov 7, 12:58pm Nov 7, 12:58pm
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saspence22
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Wow...I always thought it was a bad idea to cut that off!! I was wrong I guess. So, if I had a larger pipe ran from the headers, cut the cat off and ran no muffler or a glass pack; It would be better than what I have now?? (No res. and glass pack)


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Re: CEL after install of exhaust [Re: JBing] #58645 Nov 7, 1:00pm Nov 7, 1:00pm
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I don't know about any kind of gains but I know that the ECU goes into a protect mode when those two sensors are NOT working correctly.

It says so right in the Toyota Maintenance Manual. I don't remember 100% but I doubt it's very good for the engine. I'd have to read it again.

Re: CEL after install of exhaust [Re: JBing] #58646 Nov 7, 1:01pm Nov 7, 1:01pm
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KEEP the res. I took it off at first and you could hear it for miles!!! rofl but I have a 2.5in pipe and it make a big dif.!!!!! thumbsup


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Re: CEL after install of exhaust [Re: JBing] #58647 Nov 7, 3:04pm Nov 7, 3:04pm
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is custom piping better confused do you feel a lot of difference confused wave wave

Re: CEL after install of exhaust [Re: JBing] #58648 Nov 8, 6:55pm Nov 8, 6:55pm
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I never had a name brand aftermarket exhaust, but over the stock exhaust there is a huge difference in the lower end.


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Re: CEL after install of exhaust [Re: JBing] #58649 Nov 15, 8:42am Nov 15, 8:42am
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removing the cat is a big improvment in performance for the celica gts! but unfortunatly the ecu clamps down on the gains after a few days.the only way it can be done without the ecu messing things up is to get one of those devices that immitates the second o2 sensor(showing a normal reading of o2 to the computer).


HYBRID:resulting from the combination of two or more mechanically dissimilar origins!
"...... code":every man is a shadow,let him be treated as such,until proven otherwise by a show of character or code!
Re: CEL after install of exhaust [Re: hybridcelica] #58650 Nov 15, 9:00am Nov 15, 9:00am
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Originally Posted by hybridcelica
removing the cat is a big improvment in performance for the celica gts! but unfortunatly the ecu clamps down on the gains after a few days.the only way it can be done without the ecu messing things up is to get one of those devices that immitates the second o2 sensor(showing a normal reading of o2 to the computer).

i've heard of these, but where can you find one for the celi?


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Re: CEL after install of exhaust [Re: element_celica] #58651 Dec 7, 5:47am Dec 7, 5:47am
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virgin islands
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Originally Posted by element_celica
Originally Posted by hybridcelica
removing the cat is a big improvment in performance for the celica gts! but unfortunatly the ecu clamps down on the gains after a few days.the only way it can be done without the ecu messing things up is to get one of those devices that immitates the second o2 sensor(showing a normal reading of o2 to the computer).

i've heard of these, but where can you find one for the celi?
you can search the forums for the info on how to make one or you can contact splitsecond.com this is a partial clip message from splitsecond.
"We have the ESC2 which connects to the rear O2 sensor(s). It keeps the
>check engine light from coming on when you take off the cat.

>Regards,

>Mark "
hope you get it soughted out,its an awsome feeling with you cat out,right!



HYBRID:resulting from the combination of two or more mechanically dissimilar origins!
"...... code":every man is a shadow,let him be treated as such,until proven otherwise by a show of character or code!
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