Previous Thread
Next Thread
New Reply
Print Thread
Joined: Oct 2003
Posts: 1,549
JBing
Pizza Geek
JBing

Pizza Geek
2002 Toyota Celica GT

Joined: Oct 2003
Posts: 1,549
Detroit
Nov 7, 1:49pm - #58638 
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


FS: 19" ADR M Sports
Joined: Oct 2002
Posts: 2,677
RicePowered
ECelica Staff
RicePowered
ECelica Staff

Joined: Oct 2002
Posts: 2,677
South Jersey
Nov 7, 1:52pm - #58639 
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.

Joined: Aug 2003
Posts: 392
saspence22
sappy
saspence22

sappy
2002 Toyota Celica GT

Joined: Aug 2003
Posts: 392
Missouri
Nov 7, 1:53pm - #58640 
Would that hurt perf.???? Cutting the cat off and all?? Seems like it would lose back pressure.


[Linked Image]
Joined: Oct 2002
Posts: 2,677
RicePowered
ECelica Staff
RicePowered
ECelica Staff

Joined: Oct 2002
Posts: 2,677
South Jersey
Nov 7, 1:54pm - #58641 
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.

Joined: Oct 2003
Posts: 1,549
JBing
Pizza Geek
JBing

Pizza Geek
2002 Toyota Celica GT

Joined: Oct 2003
Posts: 1,549
Detroit
Nov 7, 1:54pm - #58642 
ok, so just ignore the light?


FS: 19" ADR M Sports
Joined: Oct 2003
Posts: 1,549
JBing
Pizza Geek
JBing

Pizza Geek
2002 Toyota Celica GT

Joined: Oct 2003
Posts: 1,549
Detroit
Nov 7, 1:55pm - #58643 
I have actually notice a big improvement in the hole shot


FS: 19" ADR M Sports
Joined: Aug 2003
Posts: 392
saspence22
sappy
saspence22

sappy
2002 Toyota Celica GT

Joined: Aug 2003
Posts: 392
Missouri
Nov 7, 1:58pm - #58644 
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)


[Linked Image]
Joined: Oct 2002
Posts: 2,677
RicePowered
ECelica Staff
RicePowered
ECelica Staff

Joined: Oct 2002
Posts: 2,677
South Jersey
Nov 7, 2:00pm - #58645 
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.

Joined: Oct 2003
Posts: 1,549
JBing
Pizza Geek
JBing

Pizza Geek
2002 Toyota Celica GT

Joined: Oct 2003
Posts: 1,549
Detroit
Nov 7, 2:01pm - #58646 
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


FS: 19" ADR M Sports
Joined: Sep 2003
Posts: 45
vteckiller
Member
vteckiller
2002 Absolute Red Toyota Celica
Member
2002 Toyota Celica

Joined: Sep 2003
Posts: 45
Nov 7, 4:04pm - #58647 
is custom piping better confused do you feel a lot of difference confused wave wave

Joined: Oct 2003
Posts: 1,549
JBing
Pizza Geek
JBing

Pizza Geek
2002 Toyota Celica GT

Joined: Oct 2003
Posts: 1,549
Detroit
Nov 8, 7:55pm - #58648 
I never had a name brand aftermarket exhaust, but over the stock exhaust there is a huge difference in the lower end.


FS: 19" ADR M Sports
Joined: Nov 2003
Posts: 242
hybridcelica
Member
hybridcelica
2000 silver/blue Toyota Celica
Member
2000 Toyota Celica

Joined: Nov 2003
Posts: 242
virgin islands
Nov 15, 9:42am - #58649 
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!
Joined: Apr 2003
Posts: 896
element_celica
Senior Member
element_celica

Senior Member

Joined: Apr 2003
Posts: 896
Michigan
Nov 15, 10:00am - #58650 
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?


rip celi...
95 240sx
Joined: Nov 2003
Posts: 242
hybridcelica
Member
hybridcelica
2000 silver/blue Toyota Celica
Member
2000 Toyota Celica

Joined: Nov 2003
Posts: 242
virgin islands
Dec 7, 6:47am - #58651 
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!
Join the conversation - Register Now or Log In to add your comment


Moderated by  isaac 

Member Spotlight
Krocdawg
Krocdawg
2003 Toyota Celica GT
Texas

Posts: 24
Joined: July 2003
Thanks: eCelica
Show All Member Profiles 
Recent Topics
Audio wiring issue
by redmarien. 06/24/2017 3:49 PM
Electrical Issue
by zenbone. 06/17/2017 12:40 PM
Manifold intake hose
by Celicafannn23. 06/10/2017 12:29 PM
Wheel size
by enjoi94. 06/08/2017 6:33 PM
Replaced Lock Actuator Issues
by geekbits. 06/08/2017 12:06 PM
Engine swap
by Darkgazer666. 06/06/2017 3:50 PM
What brand of wheels are these guys?
by jennmarkov. 06/05/2017 7:24 AM
WTB: Tsunami Rear Bumper
by valkyrie_gt. 06/04/2017 11:31 AM
Customize Your Toyota Celica Privacy Policy · About · Contact
Privacy Policy · About · Contact
CelicaHobby.com is an independent Toyota Celica enthusiast website. CelicaHobby.com is not sponsored by or affiliated with Toyota Motor Sales, USA, Inc. in any way. The Toyota and Celica names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.
© CelicaHobby.com, 2001-2017
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Snapshot build 20170611)