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NOX too high on smog test?

Kale on Dec 6, 2001

Oct 25, 2023 01:37 AM
by Ricks94vette

11

1,927

C4 Tech/Performance

burns, catalytic, converter, corvette, emissions, failed, fbody, flagged, high, l98, levels, lt1, nox, rich, smog

Failed Smog

DEJ08 on Jan 5, 2012

Jan 9, 2012 05:20 PM
by Will's'74VetteL-82

7

7,633

C4 Tech/Performance

1995, 2007, 84, components, control, corvette, emission, emissions, engine, lt1, nox, parts, sensor, smog, system

Emission Control System for the LT1

c92vette on Oct 11, 2011

Oct 11, 2011 10:24 AM
by 1963SS

2

3,055

C4 Tech/Performance

corvette, curb, emmissions, fail, failed, failing, hc, idle, inspection, low, lt1, maryland, nj, nox, ppm, test

Failed Emmissions test ?

daddysvet92 on May 15, 2011

May 21, 2011 11:48 PM
by daddysvet92

11

1,906

C4 Tech/Performance

95, corvette, emmissions, fail, nox, ontario, ppm, seniors, test

Failed Emmissions Test?

daddysvet92 on May 15, 2011

May 15, 2011 01:13 PM
by mike100

1

829

C4 Tech/Performance

57, 91, chevy, corvette, emissions, facility, failed, hc, high, nox, smog, zr1

My ZR-1 failed smog

Bowtiefan on Dec 28, 2010

Jan 11, 2011 03:13 PM
by Bowtiefan

13

1,624

C4 ZR-1 Discussion

15mph, 1986, c5, cap, corvet, corvette, gas, high, nitrogen, nox, oxide, problem, smog, tuneup, unlock

Smog Advice High NOX - Opinions Wanted

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1 2)

gambler669 on Dec 23, 2010

Dec 26, 2010 01:28 AM
by PLRX

30

2,830

C4 Tech/Performance

c4, california, converter, corvette, corvettes, failed, high, nox, oxide, problem, problems, reading, smog, stall, starter, test

FAILED CA. smog test. Suggestions on remedy?

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1 2 3 ... Last Page)

CorvetteMike2024 on Nov 22, 2010

Dec 18, 2010 01:52 PM
by jeffp1167

138

10,509

C4 Tech/Performance

84, 90, c4, corvette, egr, failed, high, ls1, nox, smog, test

high nox on smog test

bobkart on Aug 5, 2010

Aug 6, 2010 01:12 AM
by BuzzinHornets

3

1,169

C4 Tech/Performance

1990, c5, car, corvette, emissions, high, inspection, intake, nox, obd1, pass, rid, rpm, va, virginia

VA emissions

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1 2)

Rkreigh on Jun 16, 2010

Jul 27, 2010 01:05 AM
by ßill

20

2,160

C4 ZR-1 Discussion

1984, 1988, 1995, california, cam, chevorlet, corvette, gm, hot, lt1, nox, numbers, pass, passing, smog, test

CA SMOG-Pass

PLRX on Jun 1, 2010

Jun 7, 2010 01:01 AM
by PLRX

18

1,535

C4 General Discussion

Houston guys--passing emmissions test--failed NOX

Jack Daniels on Oct 2, 2009

Oct 2, 2009 07:23 PM
by Jack Daniels

0

379

Southwest

1985 with high NOX

jaysteele on Aug 16, 2009

Aug 17, 2009 12:25 PM
by jaysteele

2

723

C4 Tech/Performance

1990, c4, carbon, corvette, ct, deleted, egr, emission, emissions, fail, failed, failure, monoxide, nox, pass, removal, tune

So My car failed Emissions...

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1 2)

RandyJ75 on May 14, 2009

May 16, 2009 08:05 AM
by ddahlgren

20

2,086

C4 Tech/Performance

1990, c4, cat, chagne, corvette, emission, emissions, fail, failed, high, nox, year

Failed emissions.... Cats?

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1 2 3)

Umrswimr on Mar 29, 2008

Apr 1, 2008 07:53 PM
by SunCr

45

2,766

C4 General Discussion

1988, alcohol, california, corvette, denatured, emission, emissions, full, half, hot, limits, lower, nox, pass, seafoam, tank

Best way to lower nox emissions

95Torch on Feb 11, 2008

Feb 13, 2008 08:42 PM
by steve haverl

11

2,704

C4 General Discussion

1989, c4, cat, corvette, emissions, engine, failures, l98, nox, removal

Understanding the 3 cat L98 system and emissions

GREGGPENN on Oct 30, 2007

Nov 1, 2007 10:55 AM
by GREGGPENN

17

1,322

C4 Tech/Performance

c4, clogged, corvette, filter, forum, fuel, high, nox

fuel filter clogged

plaidside on Aug 11, 2007

Aug 12, 2007 07:40 PM
by mechron

4

703

C1 & C2 Corvettes

383, 95, carb, corvette, eldelbrock, emission, emissions, engins, failed, failure, flutters, jaguar, nitrogen, nox, oxides, seafoam, stroker, stype

ok...i failed emissions..oxides of nitrogen failure

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1 2 3)

ittybittyfds on Feb 26, 2007

Jul 14, 2007 07:32 PM
by qwiketz

53

6,788

C4 Tech/Performance

1990, 90, corvette, hc, high, low, nox, ranger, readings

Just failed emissions, NOx was way high and no HC.

1stvette94 on Dec 14, 2006

Feb 10, 2007 02:30 PM
by Jim McCombe

18

5,256

C4 Tech/Performance

chevrolet, code, efficiency, gm, nox, obd2, p2001, threshold, trap

OBD2 Code P2001

kelp on Aug 31, 2006

Sep 1, 2006 09:49 PM
by kelp

7

1,704

C6 Tech/Performance

1992, 1994, corvette, high, nox, smogging

High NOx when smogging

qwiketz on Aug 8, 2006

Aug 9, 2006 07:03 PM
by qwiketz

2

709

C4 Tech/Performance

bad, cat, co, corvette, high, l98, measure, nox, percent, seafoam, smog, speed

failed emissions again... suggestions?

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1 2 3)

Thrak on Jul 29, 2006

Aug 5, 2006 07:54 PM
by toptechx6

51

2,242

C4 Tech/Performance

Anyone from a tough Smog State...?

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1 2)

ETM on Jul 20, 2006

Jul 31, 2006 04:31 AM
by Kalway

37

1,171

C3 Tech/Performance

1998, 89, corvette, firebird, high, nox, ppm, reading

Failed emissions for NOX, rough idle....?

XtremeVette on Jun 27, 2006

Jun 28, 2006 10:56 AM
by Don in Vermont

12

1,409

C4 Tech/Performance

1989, 95, additive, cars, corvette, egr, emision, foam, nox, producing, readings, reduce, reducing, sea, seafoam, vavle

HELP! failed emissions (Nox reading)

WEH 2000C5 on Jun 8, 2006

Jun 8, 2006 08:07 PM
by JoeF95

12

1,310

C4 Tech/Performance

HELP 91 ZR1 NOx too high

vetteboy78 on May 24, 2006

May 25, 2006 11:45 AM
by vettl83

3

532

C4 ZR-1 Discussion

Failed Smog! Old cats, maybe? Any suggestions?

jcsr72 on Nov 8, 2005

Nov 10, 2005 11:13 AM
by jcsr72

19

675

C4 Tech/Performance

bad, c4, causing, corvette, emissions, knock, nox, sensor, signs

Can a bad knock sensor cause poor emissions?

Stngray on Oct 27, 2005

Oct 28, 2005 12:37 PM
by Stngray

3

574

C4 Tech/Performance

1990, 1996, c4, co, corvette, diagnosing, emission, emissions, fail, failed, failure, high, l98, nox, reading

Failed emissions, high NOx ('89 L98) - PLEASE HELP!

TheCorvetteKid on Sep 11, 2005

Sep 11, 2005 09:33 PM
by Aggravated4life

6

1,836

C4 Tech/Performance

corvette, high, lt1, needed, nox, relpaced, stock, tuning

Failed emissions / high Nox

SS409 425HP on Aug 17, 2005

Aug 19, 2005 12:32 AM
by SunCr

8

957

C4 Tech/Performance

Failed Inspection

delpa on Mar 3, 2004

Mar 3, 2004 11:52 PM
by zwede

4

797

C3 Tech/Performance

ca, california, carb, check, corvette, fail, failed, hc, high, idle, misfire, nox, nv, smog, speed

failed smog - high HC's - help please

martinsw on Feb 10, 2004

Feb 12, 2004 03:24 PM
by The Dude

9

2,812

C3 Tech/Performance

1992, 525i, bmw, c3, check, corvette, drop, dropnox, emissions, failed, failing, high, nox, pass, smog, test

smog tests-What's the best way to drop nox?

GTR1999 on Jan 13, 2004

Jan 13, 2004 07:36 PM
by zwede

11

2,509

C3 Tech/Performance

What did I do wrong?

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1 2)

oprahrider on Jan 4, 2004

Jan 9, 2004 07:37 PM
by jimgessner

30

1,981

C1 & C2 Corvettes

1973, 88, c4, co, corvett, corvette, emission, emissions, fail, failed, high, lower, nox, reduce, test, texas

Emissions Test Failure - High CO

JackHutchison on Dec 2, 2003

Dec 2, 2003 08:43 PM
by AGENT 86

1

1,133

C4 Tech/Performance

additive, chevron, emissions, increase, nox, techron

How can I lower my NOx emissions?

DuceXcreW on Oct 18, 2003

Oct 19, 2003 10:01 AM
by DuceXcreW

8

1,310

C5 Tech

captain, houston, morgan, nox, performance, pettis

Would someone mind posting a few pics for me

69 N.O.X. RATT on Sep 20, 2003

Sep 22, 2003 06:12 PM
by 69 N.O.X. RATT

19

705

C3 Tech/Performance

2003, arizona, corvette, effect, emissions, failed, fails, gmc, high, intermittent, loop, nox, open, smog, techron, yukon

Failed emissions. Any ideas?

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1 2)

92TripleBlack on Aug 29, 2003

Sep 7, 2003 09:55 PM
by GS 163

24

1,443

C4 Tech/Performance

75, booster, boosters, c3, corvette, good, nox, octane

Octane boosters....any good?

vetteguy75 on Jun 24, 2003

Jun 26, 2003 02:22 PM
by garagedweller2

17

970

C3 Tech/Performance

NOX high again...

Kale on May 17, 2003

May 18, 2003 07:06 PM
by CorvetteZ51Racer

5

637

C4 Tech/Performance

100, 2, angle, bbc, brodix, cc, compression, dome, fit, head, heads, increase, ls1, mill, milled, nox, pistons, raise, wmissions

How much can you mill heads and not put things out of whack / compression increase ?

69 N.O.X. RATT on Dec 9, 2002

Dec 10, 2002 08:11 PM
by 69 N.O.X. RATT

5

13,111

Engine Mods

87, bad, cat, co, corvette, dyno, emission, emissions, emmisions, failed, high, l98, nox, pass, reduce, test, testing

Finally Passed Dyno Emissions Test..... Helpful Hints inside....

Marcho Polo on Oct 3, 2002

Oct 5, 2002 01:03 AM
by 1SLO POK

11

2,076

C4 Tech/Performance

1982, 2001, bad, c3, corvette, forum, high, higher, nox, o2, oxygen, prelude, reading, replace, sensor, vette

O2 sensor and high NOx reading

twotone82 on Oct 3, 2002

Oct 4, 2002 09:32 AM
by BeaterShark

6

2,364

C3 Tech/Performance

bad, corvette, egr, high, nox, reading, readings

Failed emissions because of high nox reading...whats the cause?

Vette9d1 on Jun 8, 2002

Jun 8, 2002 08:20 PM
by PeteL

6

586

C4 Tech/Performance

bad, c4, clean, corvette, failed, fuel, fuell, holley, howtotelliffuelpressureregulatorisbad, nox, pressure, reg, regulator

how can i tell if my fuel pressure regulator is bad??

CDaniel525 on Mar 27, 2002

Mar 29, 2002 12:54 AM
by 69 N.O.X. RATT

5

1,635

Engine Mods

1981, 81, air, catalyst, corvette, emission, emissions, high, low, nc, nox, pump, readings, test, testing

81 failed Emissions test

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1 2 3)

ksems on Mar 14, 2002

Mar 17, 2002 01:38 PM
by ksems

41

3,543

C3 Tech/Performance

1969, analysis, boost, booster, c3, corvette, nox, octane, shootout, xylene, zylene

Octane Booster Suggestions.

SprintCarDriver on Feb 28, 2002

Mar 1, 2002 11:50 AM
by SprintCarDriver

11

793

C3 Tech/Performance

buy, code, failed, im240, inaccurate, manually, nox, test

Just failed IM240

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1 2)

91Yellow1 on Jan 28, 2002

Jan 29, 2002 07:10 PM
by CFI-EFI

23

1,298

C4 Tech/Performance

NOX on L98

Finland on Sep 18, 2001

Sep 29, 2001 02:24 PM
by Finland

6

585

C4 Tech/Performance

Threads Tagged with nox