Also idles very nice ,revs up without any hesatation in park .
exotic muscle /w corsa exaust problem HELP!!
Thread Starter
Pro
Joined: Jul 2008
Posts: 699
Likes: 0
From: Wichita Falls Tx
exotic muscle /w corsa exaust problem HELP!!
Well i finally got around to putting the exaust on my 94 lt1.Exotic muscle with full corsa exhaust cats deleted what do i need to do with the o2 sensor that was behind the passanger cat.This thing feels like i lost bottom end power big time And running like pure crap .Nothing else was done the car .HELPPPPPP! 
Last edited by kleptopigdog; May 8, 2012 at 06:55 PM.
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
Very simple, looks like you did an O2 sensor delete and have the plug hanging back there. Do you have the engine light lit?
You can have the post O2 sensor tuned out by a tuner.
I've been next to cats delete Vettes and the smell is horrible. I recommend for you to install hi-flo cats and any muffler shop can weld on O2 sensor plugs.
You can have the post O2 sensor tuned out by a tuner.
I've been next to cats delete Vettes and the smell is horrible. I recommend for you to install hi-flo cats and any muffler shop can weld on O2 sensor plugs.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Well i finally got around to putting the exaust on my 94 lt1.Exotic muscle with full corsa exhaust cats deleted what do i need to do with the o2 sensor that was behind the passanger cat.This thing feels like i lost bottom end power big time And running like pure crap .Nothing else was done the car .HELPPPPPP!
I'll guess that you have a couple plug wires crossed or not on all the way. Also make sure you didn't crack a plug when you were installing the headers.
Tech Contributor
Joined: Oct 2011
Posts: 525
Likes: 9
From: Annapolis MD
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
The second o2 sensor on a '94 does nothing. It was there only for field testing purposes as the transition was made to OBD II starting in 1996. Even with OBD II, the aft o2 sensors do nothing except report on the performance of the cats. They have nothing to do with fueling.
I'll guess that you have a couple plug wires crossed or not on all the way. Also make sure you didn't crack a plug when you were installing the headers.
I'll guess that you have a couple plug wires crossed or not on all the way. Also make sure you didn't crack a plug when you were installing the headers.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
A properly tuned car with bullet cats doesn't burn the eyes at idle and it certainly doesn't smell like rotten eggs (which is a sign of a faulty cat and/or the need for a tune). All the OP is doing with no cats is making added noise while gaining zero power.
...and yes I have Random Tech bullet cats on mine with EM long tubes and Corsa exhaust and no, it doesn't smell like rotten eggs.
Thread Starter
Pro
Joined: Jul 2008
Posts: 699
Likes: 0
From: Wichita Falls Tx
plugs good ,firing order correct .Just took it for a spin around the block runs horrible.I've always been a fan of converters [took them off before when i put flow masters on it ,took it to the muffler shop the next day and put them back on]This time every thing i read on this system said no loss with out them .Any way any more ideas .No codes thrown.??????????
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Le Mans Master
Joined: Jul 1999
Posts: 8,683
Likes: 6
From: Phoenix AZ
The second o2 sensor on a '94 does nothing. It was there only for field testing purposes as the transition was made to OBD II starting in 1996. Even with OBD II, the aft o2 sensors do nothing except report on the performance of the cats. They have nothing to do with fueling.
I'll guess that you have a couple plug wires crossed or not on all the way. Also make sure you didn't crack a plug when you were installing the headers.
I'll guess that you have a couple plug wires crossed or not on all the way. Also make sure you didn't crack a plug when you were installing the headers.
Melting Slicks
Joined: Jan 2009
Posts: 3,482
Likes: 196
From: folsom california
isn't at least one O2 sensor a necessary component for any computer controlled car ? i.e it allows the computer to run in a closed loop mode ? otherwise the computer has no way of measuring fuel demand to load and defaults to the open loop or "limp home" mode (which sounds very much like your car). the OBII cars have two sensors at each cat; one before and one after each cat; the second O2 sensor to allow measuring of the efficiency of the cat itself. Am I wrong ?
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
The aft o2s are for OBD II compliance only. They verify cat operation. When you watch the forward O2 sensors on a scanner or using logging software, you see the voltage swings. The aft o2 sensor voltage is basically flat.
I ran my '96 for quite sometime with only the forward o2 sensors. Ultimately I added o2 sensor bungs and sensors aft of my bullet cats so that the cat emissions flags would set in the PCM and I could pass the OBD II plug in emissions test. Prior to that, I had to do the sniffer test (and passed).
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Hmmm...It's not monitored by the PCM and there's not a bank 2 sensor 2 code for '94s & '95s so it shouldn't light the SES lamp. I'm traveling, so I'll try to remember to dig through my notes when I get home a week.
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
Intermediate
Joined: May 2012
Posts: 25
Likes: 0
From: Ottawa KS
Could the new exhaust system have eliminated too much back pressure? I've heard that a certain amount of back pressure is beneficial to some motors, but I don't know which types or if it's even true. For all I know it could just be one of those rumors that's always been passed around.
Pro
Joined: Jul 2002
Posts: 703
Likes: 0
From: Milwaukee Wi
Even thought the SES CE light is not lit it may still spit out a code. I would take it to AutoZOne or mechanic and scan for codes.
When the headers/exhaust was installed it did something mechanical. Plug wires seated. Plug wires crossed(easy to do). Wires to 02 sensors damaged or fried.
When the headers/exhaust was installed it did something mechanical. Plug wires seated. Plug wires crossed(easy to do). Wires to 02 sensors damaged or fried.
