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03-15-2007, 02:14 PM
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#1
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Join Date: Jul 2006
Location: Hamilton, Nj/Glassboro, Nj
Posts: 799
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Speaking of inspection...
speaking of inspection, i have a 94 z28 with a k&n filter kit, magnaflow stainless steel cats, and some other little mods but i cant pass emissions. my o2 sensors are brand new. im trying to replace the old cat with a new highflow one, maybe that will work. my numbers were off the chart last time i went threw. by the way.. the first time i failed for visible smoke i had a broken lifter.. but that was fixed. and it also runs very rich
Last edited by Camvill; 03-15-2007 at 02:14 PM.
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03-15-2007, 02:16 PM
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#2
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,476
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Running rich is prolly your biggest reason for not passing. Have you spent any time trying to figure out why it's rich? Not only is that bad for emissions, but it hurts your performance and mileage as well.
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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03-15-2007, 03:50 PM
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#3
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Join Date: Jul 2005
Location: Williamstown NJ
Posts: 479
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Dont put a high-flow cat on it if you want to pass inspection. An old stock cat will get you through the sniffer easier than a brand new aftermarket high-flow unit. Believe me. I know. I have been running around with a REJECTED sticker on my car for over a year now!! haha
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F-Bodyless 
01 GMC Sierra C3 6.0L, AWD, Westers Tune, K&N, Hella LED Tails
03 Pontiac Grand Prix GT, GMPP Handling Kit, LS1 F-Body Brakes
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03-15-2007, 05:44 PM
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#4
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Hippy Mod, Bergermeister Meisterberger, Moderator
Join Date: Aug 2004
Location: Ewing
Posts: 6,214
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My old 93 was able to pass emission's with a Powerdyne supercharger, SVO injectors, Borla y-pipe, Random high flow cat, Flowmaster cat-back, Jacobs ignition, 160 t-stat and SLP off the shelf chip(not programmed for the supercharger). So you must still have something pretty wrong to be running rich and not pass. Put a scanner on it to look at the sensor's to see if you can find something that indicates why it's running rich.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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03-15-2007, 09:06 PM
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#5
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,165
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Fix the richness. That will damage the cat in the long run as well.
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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03-16-2007, 12:00 PM
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#6
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Join Date: Jul 2006
Location: Hamilton, Nj/Glassboro, Nj
Posts: 799
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???
what can make it run rich like that, i already checked the injectors they are fine, and the fuel pressure regulator was checked as well, its brand new. what im thinking is it could be a clogged cat due to the lifter being left unfixed for awhile. and yes im getting about 80 miles to a full tank
Last edited by Camvill; 03-16-2007 at 12:07 PM.
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03-16-2007, 12:20 PM
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#7
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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I would check the functioning of your O2 sensors. Even new, they might be fouled out. How is your ignition system?
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03-16-2007, 04:02 PM
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#8
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,165
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I take it you checked the fuel pressure? What are the 'other little mods'? No stored SES codes? Air inlet temp sensor?
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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03-16-2007, 05:44 PM
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#9
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Hippy Mod, Bergermeister Meisterberger, Moderator
Join Date: Aug 2004
Location: Ewing
Posts: 6,214
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Look for things like a rip in the intake boot after the MAF, bad plug wires, bad O2 sensor, bad EGR. Have you had the car scanned to see if there are any stored codes? Autozone will scan for free.
__________________
69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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03-16-2007, 06:54 PM
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#10
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Join Date: Jul 2006
Location: Hamilton, Nj/Glassboro, Nj
Posts: 799
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inspection
idk maybe i will just bring it to a mechanic and have them diagnose it for 60 bucks if this cat doesnt work.
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03-24-2007, 09:27 AM
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#11
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Join Date: Jul 2006
Location: Hamilton, Nj/Glassboro, Nj
Posts: 799
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Put new cat in
well i just put the new cat in and wow its alot louder now lol. also i notice slight better throttle response. it still smells like gas but now it smells like clean gas. well off to the shop to get it diagnosed
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03-30-2007, 04:06 PM
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#12
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Join Date: Jul 2006
Location: Hamilton, Nj/Glassboro, Nj
Posts: 799
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well i got it fixed
well i got my car fixed the guy i bought the car off of put the spark plug wires on the exhaust and melted them...so i was running on 7 cyls. all my levels are really low cept the nox lvls which are controlled by the egr valve and the cat. i have a brand new egr valve. i just installed a high flow cat so i guess thats why . any ideas on what else i can do?
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04-04-2007, 11:09 PM
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#13
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Join Date: Jul 2006
Location: Hamilton, Nj/Glassboro, Nj
Posts: 799
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any at all?
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93 Civic HB 1.5L-70hp :-p-Sold
94 Camaro Z28-CAI with bellow, LCAS, 3.73 gears, A4, 275/40/zr17-silver Zr1's, Magnaflow Stainless steel exhaust. For Sale-This Spring Best 1/4 Time-13.5-Sold
CURRENT RIDE- 99 Z28 with Ground Effects Slp intake Exhaust and Short Throw shifter- best 1/4 -13.34@105.6 New mods yet to be tested->Pacestter long tubes--->Tune by TTP= 349 RWHP 362 Ftlbs
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