OBDII-Emmisions question
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Racer
Joined: Sep 2005
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OBDII-Emmisions question
So I have a 1996 LT4 with OBDII. I heard that you dont ever get a sniffer test with an OBDII car because they run the OBDII computer diagnostic instead...is that true? If so does that mean I could cut the cats off completely and just use an O2 Simulator and get away with it?
Race Director
Joined: Sep 2005
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From: Sharpsburg Georgia
GA Events Coordinator
No, there is a visual inspection on cats here in GA, now you could gut the cats and get away with it, not sure why you would want to go to that much trouble.
If it looks like the cats are there and there are no codes and it (the ECM) is in a ready state it will pass.
Greg
If it looks like the cats are there and there are no codes and it (the ECM) is in a ready state it will pass.
Greg
Race Director
Joined: Apr 2000
Posts: 15,344
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From: Texas
Originally Posted by Achilleus07
So I have a 1996 LT4 with OBDII. I heard that you dont ever get a sniffer test with an OBDII car because they run the OBDII computer diagnostic instead...is that true? If so does that mean I could cut the cats off completely and just use an O2 Simulator and get away with it?
Melting Slicks
Joined: Jan 2005
Posts: 2,604
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From: Phoenix, Arizona
Here in Phx (Maricopa county) there is no visual check. I'm running LT Headers w/ no cats (96 LT4) as are other LTx OBD2 owners I've talked to...
Guess it depends on locale.
Guess it depends on locale.
Last edited by JEFNLSA; Feb 16, 2006 at 04:28 PM.
Team Owner
Joined: Aug 2000
Posts: 40,156
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From: San Pedro CA
It depends on the emissions requirements. If your local ozone numbers start to creap up, a visual will be coming soon... trust me.
I ask, why gut the cats? they are not robbing you of much power, 5hp or so... Infact, the act of gutting ROBS even more power! The hollow chamber left behind is a real bad idea for exhaust flow...
I ask, why gut the cats? they are not robbing you of much power, 5hp or so... Infact, the act of gutting ROBS even more power! The hollow chamber left behind is a real bad idea for exhaust flow...
Le Mans Master
Joined: Jan 2006
Posts: 6,564
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From: Woodstock Georgia
Originally Posted by blown87
No, there is a visual inspection on cats here in GA, now you could gut the cats and get away with it, not sure why you would want to go to that much trouble.
If it looks like the cats are there and there are no codes and it (the ECM) is in a ready state it will pass.
Greg
If it looks like the cats are there and there are no codes and it (the ECM) is in a ready state it will pass.
Greg
Race Director
Joined: Apr 2000
Posts: 15,344
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From: Texas
Originally Posted by Redeasysport
And what make you think it is OBD II?My understanding is OBD II came in on the 96 model with the crank trigger int the timing cover although the plug was changed earlier.Confusing huh?
This makes no sense. He clearly states his car is a '96 LT4. All '96 Vettes were OBD II compliant/certified per federal law.FWIW, it's not a crank trigger which implies it's used for engine operation. It's a crankshaft position sensor and it's sole purpose in life is to allow the PCM to determine engine misfire for OBD II. The engine runs fine without it.
Race Director
Joined: Sep 2005
Posts: 13,269
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From: Sharpsburg Georgia
GA Events Coordinator
Originally Posted by aminnich
Really? I have had many cars, over many years thru the Ga emissions and have never seen anyone do a visual. Did not even know they were supposed to.
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Race Director
Joined: Sep 2005
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From: Sharpsburg Georgia
GA Events Coordinator
Originally Posted by bogus
I suspect it is the specific county you are in. That will change a lot.
There are even parts of Northern California that are not under the watchful eye of CARB. Facinating.
There are even parts of Northern California that are not under the watchful eye of CARB. Facinating.
Drifting
Joined: May 2003
Posts: 1,730
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From: Charlotte NC
St. Jude Donor '05
It really depends on the area. In NC a visual is a part of the safety and a OBD2 plug in meets the emmissions requirements.. The inspections here will never be just a plug in check.. afterall, a purpose of the inspection is to get cars with bad suspensions, exhaust leaks, etc. .. off the road before someone gets hurt.
Now, just 30 miles south of me in SC there is no inspection at all.. no safety and no emmissions.. Crazy ain't it?
Now, just 30 miles south of me in SC there is no inspection at all.. no safety and no emmissions.. Crazy ain't it?