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Joined: Feb 2004
Posts: 500
falkkor
Senior Member
falkkor Dec 6, 1:11am - #343694 

Senior Member
2000 Toyota Celica

Joined: Feb 2004
Posts: 500
Lompoc, CA (805)
Greddy Evo mod : WARNING!

Origional Topic : https://www.celicahobby.com/ubbthrea...o=&fpart=2&vc=1



Ok so I had it done had it on for about a month and a half. Last week my CEL cam on and my car started backfiring like crazy, I felt a huge power loss. the CEL code was P0171: Engine too lean.

Cleaned MAF, Injectors, ect nothing fixed. CEL kept coming back. Had my Resonator put back into the Greddy and Problem was solved...


Be warned
Joined: Jul 2002
Posts: 10,123
VSGTS14
05 WRB
VSGTS14 Dec 6, 4:10am - #343695 

05 WRB
2005 Subaru WRX STi

Joined: Jul 2002
Posts: 10,123
Milford, NJ
how big was ur piping?

SUBARU TECNICA INTERNATIONAL
Joined: Sep 2004
Posts: 756
FastCelicaGT22
Senior Member
FastCelicaGT22 Dec 6, 8:46am - #343696 

Senior Member
2000 Toyota Celica GT

Joined: Sep 2004
Posts: 756
Columbus, Ohio
not getting enough backpreasure and it was cousing your engine to go lean. the only thing you can do is to do an ecu upgrade if you want to run that setup. Id just leave the resonator in if its working

"If your not the lead Dog the View never Changes"
Joined: Apr 2003
Posts: 802
shox
Senior Member
shox Dec 6, 11:20am - #343697 

Senior Member
2003 Toyota Celica GT

Joined: Apr 2003
Posts: 802
Calgary, Alberta
I've had my resonator out for like...4 months now and I have an HKS Hi-Power. There's no way your car can detect something like that. The last sensor the Celica has is just after the Catalytic Converter. If you removed the resonator then that sensor should still be intact and working fine because it cannot detect anything after that. I just don't believe you can get a CEL from removing the resonator, you're the first I've heard of for sure.
Joined: Apr 2004
Posts: 427
speed_celica
Senior Member
speed_celica Dec 6, 5:25pm - #343698 

Senior Member
2000 Toyota Celica

Joined: Apr 2004
Posts: 427
Calgary, AB, Canada
Originally Posted by shox
I've had my resonator out for like...4 months now and I have an HKS Hi-Power. There's no way your car can detect something like that. The last sensor the Celica has is just after the Catalytic Converter. If you removed the resonator then that sensor should still be intact and working fine because it cannot detect anything after that. I just don't believe you can get a CEL from removing the resonator, you're the first I've heard of for sure.

I agree! Think about the people with the Kazuma exhaust, wouldn't they have even less back pressure not have any mufflers, canisters or resonators? And no one I know with the Kazuma had any problems. Could it be anything else that's causing it?
Joined: May 2004
Posts: 528
renfield90
Senior Member
renfield90 Dec 6, 7:53pm - #343699 

Senior Member
2001 Toyota Celica GT

Joined: May 2004
Posts: 528
Tempe, AZ
pull it back out for a few weeks and see if it comes back.
Joined: Aug 2004
Posts: 1,029
kmlgts
Specialist
kmlgts Dec 6, 10:20pm - #343700 

Specialist
2000 Toyota Celica

Joined: Aug 2004
Posts: 1,029
California
Originally Posted by speed_celica
Originally Posted by shox
I've had my resonator out for like...4 months now and I have an HKS Hi-Power. There's no way your car can detect something like that. The last sensor the Celica has is just after the Catalytic Converter. If you removed the resonator then that sensor should still be intact and working fine because it cannot detect anything after that. I just don't believe you can get a CEL from removing the resonator, you're the first I've heard of for sure.

I agree! Think about the people with the Kazuma exhaust, wouldn't they have even less back pressure not have any mufflers, canisters or resonators? And no one I know with the Kazuma had any problems. Could it be anything else that's causing it?


agree.. thumbsup
Joined: Jul 2002
Posts: 10,123
VSGTS14
05 WRB
VSGTS14 Dec 7, 10:22pm - #343701 

05 WRB
2005 Subaru WRX STi

Joined: Jul 2002
Posts: 10,123
Milford, NJ
yea, it def sounded wrong...
cause removing resonator is sound, nothing for backpressure...like kazuma...
Greddy sucks! ha, i saw others who have it and its fine..ur celica is messed up

SUBARU TECNICA INTERNATIONAL
Joined: Oct 2003
Posts: 1,572
DaBigTickett
Rip the Jacker
DaBigTickett Dec 8, 1:20am - #343702 

Rip the Jacker
2002 Toyota Celica GT

Joined: Oct 2003
Posts: 1,572
Chino Hills, CA
good thing i didnt do that mod with my EvoII.
Joined: Apr 2003
Posts: 802
shox
Senior Member
shox Dec 8, 12:33pm - #343703 

Senior Member
2003 Toyota Celica GT

Joined: Apr 2003
Posts: 802
Calgary, Alberta
The backfiring I can understand cause I backfire a little, but not intensely crazy just when I let go of the throttle at high RPMs. But the CEL is still a mystery to me...
Joined: Nov 2003
Posts: 453
Jtultra
Senior Member
Jtultra Dec 11, 9:33pm - #343704 

Senior Member
2000 Toyota Celica

Joined: Nov 2003
Posts: 453
Marietta, GA
yea I have a custom megan racing canister welded on from the 1st resinator back. But I did get a CEL from bad O2 sensors went through a whole hectic hoopla to figure it out and I had emmission due. I worked w/ a mechanic at Toyota "cobb county toyota is amazing" and we came to conclusion it had to be the ECU. it was! and he got it replaced under the 80,000 mile warrantee. it was great

The 2ZZ god
Joined: Dec 2003
Posts: 785
celicat23
Senior Member
celicat23 Dec 12, 11:39pm - #343705 

Senior Member
2000 Toyota Celica

Joined: Dec 2003
Posts: 785
norway
I had a custom exhaust made, from the cat and all the way back. Removed every OEM part. Backfires? Sure, some times. A slight noticable gain in performance? Yes. Awesome sound? Yes. Check engine light? Never.

Have driven it like I stole it? Yes :-)
Joined: May 2004
Posts: 22
shambhala412
Member
shambhala412 Dec 13, 6:02pm - #343706 
2001 Absolutely Red Toyota Celica
Member
2001 Toyota Celica

Joined: May 2004
Posts: 22
Pennsylvania
I have done the Greddy Evo II Mod. I have experience minimal backfiring, more like slight pops/cracks. The only difference I have found from modified Evo II and un-modified Evo II is it's super loud, the way I wanted it. Sorry to hear your having problems.
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