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05-18-2012, 02:45 PM
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#1
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Join Date: Oct 2009
Location: Sicklerville, NJ (South Jersey)
Posts: 450
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Need some help
I replaced the O2 sensors that were bad, new ECT(the one for the ECM), Hoked up my scanner and everything is reading normal. Car runs great, normal idle. What else could be causing these levels at inspection?
Car has manifolds and all emissions hooked up.
This is a re inspection, values all increased after replacing sensors. Original values were 3200 +or-. 
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1994 Z28 M6
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05-18-2012, 03:40 PM
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#2
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Join Date: Aug 2005
Location: Blackwood, NJ
Posts: 2,295
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If this is your firebird then its the aftermarket cam.. once you put a aftermarket cam in it the car will never pass the Sniffer!!
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Jeff
2002 WS6 T/A.. M6..Built 383 TMR tune..461rwhp,458rwtq
2009 G8 GT. Bone stock 13.6@103.. Vararam Intake, GXP Axlebacks, LS2 FRC's
1998 Corvette Convertible, Vararam Intake+Power Duct, Fast 90/90, Ti Axleback..12.8@110
2003 Cobra Convertible 10th Anniversary
http://www.fquick.com/slow-v6
Local car cruise schedule..
http://www.cliffscalendar.com/
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05-18-2012, 03:49 PM
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#3
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Join Date: Oct 2009
Location: Sicklerville, NJ (South Jersey)
Posts: 450
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Yeah it's mine. If there is no hope for passing the sniffer I guess I have to look to other means.
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1994 Z28 M6
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05-18-2012, 03:52 PM
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#4
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Join Date: Aug 2005
Location: Blackwood, NJ
Posts: 2,295
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Thats more then likely what you will have to do.. Might as well get headers and what not as well. Free up some more power!!
__________________
Jeff
2002 WS6 T/A.. M6..Built 383 TMR tune..461rwhp,458rwtq
2009 G8 GT. Bone stock 13.6@103.. Vararam Intake, GXP Axlebacks, LS2 FRC's
1998 Corvette Convertible, Vararam Intake+Power Duct, Fast 90/90, Ti Axleback..12.8@110
2003 Cobra Convertible 10th Anniversary
http://www.fquick.com/slow-v6
Local car cruise schedule..
http://www.cliffscalendar.com/
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05-18-2012, 04:01 PM
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#5
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Dave,
You have functional cats and such on this car?
Can you hook up TTS Datamaster and give us a scan?
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05-18-2012, 04:03 PM
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#6
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Join Date: Oct 2009
Location: Sicklerville, NJ (South Jersey)
Posts: 450
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Yeah now that I have a scanner and verified everything is good longtubes are in the near future.
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1994 Z28 M6
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05-18-2012, 04:06 PM
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#7
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Join Date: Oct 2009
Location: Sicklerville, NJ (South Jersey)
Posts: 450
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Quote:
Originally Posted by WildBillyT
Dave,
You have functional cats and such on this car?
Can you hook up TTS Datamaster and give us a scan?
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There is a cat. Thinking of replacing with new. I have to get a serial to USB cable to plug in to my laptop. I have a snap on mt2500 so I figured I could just use the cable and connector from that. Then I can do some data logging.
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1994 Z28 M6
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05-18-2012, 04:08 PM
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#8
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Also, was the car tuned properly for the cam?
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05-18-2012, 04:14 PM
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#9
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Join Date: Oct 2009
Location: Sicklerville, NJ (South Jersey)
Posts: 450
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Quote:
Originally Posted by WildBillyT
Also, was the car tuned properly for the cam?
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I couldn't tell ya. I don't even know what can is in there. Short of tearing it apart I don't know what to do lol.
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1994 Z28 M6
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05-18-2012, 07:18 PM
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#10
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11 second club / Moderator
Join Date: Aug 2004
Location: West Berlin, NJ
Posts: 7,148
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Quote:
Originally Posted by Slow-V6
If this is your firebird then its the aftermarket cam.. once you put a aftermarket cam in it the car will never pass the Sniffer!!
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Do you mean just his car, or all in general?
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2001 Trans Am WS6 •SLP Loudmouth II •UMI Suspension •12.857 @ 109.57
1996 Trans Am WS6 •Pacesetter Longtubes •Strange 12 Bolt •Spohn Suspension •11.152 @ 123.85
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05-18-2012, 08:05 PM
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#11
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Air/Fuel ratio is rich. Why? Well that's for you to diagnose and repair!
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05-18-2012, 09:18 PM
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#12
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Join Date: Oct 2009
Location: Sicklerville, NJ (South Jersey)
Posts: 450
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Quote:
Originally Posted by sweetbmxrider
Air/Fuel ratio is rich. Why? Well that's for you to diagnose and repair!
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I didn't think to diagnose the problem... 
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1994 Z28 M6
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05-18-2012, 09:27 PM
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#13
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Join Date: May 2010
Location: Brick, NJ
Posts: 1,868
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The tune might be off.. or it has a unfriendly LSA
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Formerly known as blk95formula
86t/a_ram_air on TGO
2018 Silverado 1500
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05-18-2012, 09:28 PM
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#14
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Join Date: Oct 2009
Location: Sicklerville, NJ (South Jersey)
Posts: 450
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I was thinking the tune as well but unfortunately theres no way for me to get it tuned properly without tearing it apart to figure out the cam. Right now it is my DD so having it down for a day or two to tear it down isnt a viable option right now.
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1994 Z28 M6
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05-19-2012, 08:51 AM
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#15
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Join Date: May 2010
Location: Brick, NJ
Posts: 1,868
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Quote:
Originally Posted by Slow-V6
If this is your firebird then its the aftermarket cam.. once you put a aftermarket cam in it the car will never pass the Sniffer!!
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it most likely not an emissions friendly cam, there are cams out there that you can use that will still allow you to pass the sniffer. It's much easier on a OBD2 car because there is no sniffer, they just plug it in
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Formerly known as blk95formula
86t/a_ram_air on TGO
2018 Silverado 1500
Last edited by greenformula92; 05-19-2012 at 08:52 AM.
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05-19-2012, 01:47 PM
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#16
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Quote:
Originally Posted by Green_Phoenix_LT1
I was thinking the tune as well but unfortunately theres no way for me to get it tuned properly without tearing it apart to figure out the cam. Right now it is my DD so having it down for a day or two to tear it down isnt a viable option right now.
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You tune it with a wideband.......
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05-21-2012, 12:01 AM
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#17
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Join Date: Aug 2005
Location: Blackwood, NJ
Posts: 2,295
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Quote:
Originally Posted by deadtrend1
Do you mean just his car, or all in general?
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I mean a car that has any kind of big aftermarket cam in it will more then likely not pass emmision. If you have a LT4/LS6/Cheater cam then it might pass.
__________________
Jeff
2002 WS6 T/A.. M6..Built 383 TMR tune..461rwhp,458rwtq
2009 G8 GT. Bone stock 13.6@103.. Vararam Intake, GXP Axlebacks, LS2 FRC's
1998 Corvette Convertible, Vararam Intake+Power Duct, Fast 90/90, Ti Axleback..12.8@110
2003 Cobra Convertible 10th Anniversary
http://www.fquick.com/slow-v6
Local car cruise schedule..
http://www.cliffscalendar.com/
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05-21-2012, 07:30 AM
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#18
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Join Date: May 2010
Location: Brick, NJ
Posts: 1,868
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the GM hot cam kit will pass inspection too
__________________
Formerly known as blk95formula
86t/a_ram_air on TGO
2018 Silverado 1500
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05-21-2012, 08:52 AM
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#19
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,899
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Quote:
Originally Posted by Slow-V6
I mean a car that has any kind of big aftermarket cam in it will more then likely not pass emmision. If you have a LT4/LS6/Cheater cam then it might pass.
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Big cam != fail, and small cam != always pass.
I had a small cam, with a tight lobe angle and it would fail. Big cam with larger overlap in a bigger cube motor, prob may passs. Details are fun.
I was get a few datalogs of the car, send em to PCMforless and try to get it worked out with just the narrow bands. Tough part will prob be the shift tables and where you want WOT etc to be.
What kind of injectors are on there now and if you could, see where your duty cycle is next time you hit WOT.
Edit: Also depending on how much you really care bout knowing the exact cam specs.. you could pull the intake and attempt to degree the cam. Would at least get you a approximate number on lift at least, and from there you could calculate overlap etc.
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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Last edited by LTb1ow; 05-21-2012 at 12:55 PM.
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05-21-2012, 01:32 PM
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#20
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Join Date: Aug 2005
Location: Blackwood, NJ
Posts: 2,295
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I dont know if Dave would know the size of the injectors or what fuel pump is in the tank. We tried to figure it out but they look stock. We need the S/N off the injectors to find out if they are stock or not. We could get a Fuel pressure gauge on the fuel rail to see if there is a aftermarket pump in the back as well.I know the car dynoed 287rwhp @4000rpms yesterday. The car has stock heads, and stock manifolds. So basically with Catback, CAI, and cam are the mods.
__________________
Jeff
2002 WS6 T/A.. M6..Built 383 TMR tune..461rwhp,458rwtq
2009 G8 GT. Bone stock 13.6@103.. Vararam Intake, GXP Axlebacks, LS2 FRC's
1998 Corvette Convertible, Vararam Intake+Power Duct, Fast 90/90, Ti Axleback..12.8@110
2003 Cobra Convertible 10th Anniversary
http://www.fquick.com/slow-v6
Local car cruise schedule..
http://www.cliffscalendar.com/
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05-21-2012, 01:44 PM
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#21
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Do you have proof that an aftermarket cam is, in fact, installed?
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05-21-2012, 01:47 PM
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#22
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,899
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Fuel pressure won't really help much, as long as its not an adjustable regulator, the FP will either be stock, or too little, neither really indicate much excecpt for a dead pump or good pump.
Really, the easiest way would be a dyno tune, but good luck finding a compentant LT1 tuner locally.
Quote:
Originally Posted by WildBillyT
Do you have proof that an aftermarket cam is, in fact, installed?
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The HP number is a little high for a stock cam through an auto, I would guess hot cam sized cam may be in there.
Another option would be to pull the current tune and see if its a stocker or been modified.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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Last edited by LTb1ow; 05-21-2012 at 01:48 PM.
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05-21-2012, 01:53 PM
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#23
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Honestly, unless this car is running at 10:1 and has some beat cats, you aren't getting those numbers down.
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05-21-2012, 08:20 PM
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#24
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Join Date: May 2010
Location: Brick, NJ
Posts: 1,868
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possible cats are gutted?
__________________
Formerly known as blk95formula
86t/a_ram_air on TGO
2018 Silverado 1500
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05-21-2012, 09:31 PM
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#25
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Join Date: Oct 2009
Location: Sicklerville, NJ (South Jersey)
Posts: 450
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It's a 1 cat car. It is factory style and there are no breaks in the welds on the y pipe or behind the cat so it's not gutted. Could very possibly be bad though. I'm just waiting to do headers with a cartted y pipe. Trying to run a history on the car to track down past owners to maybe get some paperwork. Longshot but ya never know
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