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NOX too high on smog test?

Kale on 12-06-2001

10-25-2023 01:37 AM
by Ricks94vette

11

1,488

C4 Tech/Performance

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

Failed Smog

DEJ08 on 01-05-2012

01-09-2012 05:20 PM
by Will's'74VetteL-82

7

6,901

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 10-11-2011

10-11-2011 10:24 AM
by 1963SS

2

2,643

C4 Tech/Performance

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

Failed Emmissions test ?

daddysvet92 on 05-15-2011

05-21-2011 11:48 PM
by daddysvet92

11

1,668

C4 Tech/Performance

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

Failed Emmissions Test?

daddysvet92 on 05-15-2011

05-15-2011 01:13 PM
by mike100

1

738

C4 Tech/Performance

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

My ZR-1 failed smog

Bowtiefan on 12-28-2010

01-11-2011 03:13 PM
by Bowtiefan

13

1,443

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 12-23-2010

12-26-2010 01:28 AM
by PLRX

30

2,635

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 11-22-2010

12-18-2010 01:52 PM
by jeffp1167

138

9,426

C4 Tech/Performance

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

high nox on smog test

bobkart on 08-05-2010

08-06-2010 01:12 AM
by BuzzinHornets

3

1,059

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 06-16-2010

07-27-2010 01:05 AM
by ßill

20

2,005

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 06-01-2010

06-07-2010 01:01 AM
by PLRX

18

1,172

C4 General Discussion

Houston guys--passing emmissions test--failed NOX

Jack Daniels on 10-02-2009

10-02-2009 07:23 PM
by Jack Daniels

0

319

Southwest

1985 with high NOX

jaysteele on 08-16-2009

08-17-2009 12:25 PM
by jaysteele

2

658

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 05-14-2009

05-16-2009 08:05 AM
by ddahlgren

20

1,862

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 03-29-2008

04-01-2008 07:53 PM
by SunCr

45

2,355

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 02-11-2008

02-13-2008 08:42 PM
by steve haverl

11

2,346

C4 General Discussion

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

Understanding the 3 cat L98 system and emissions

GREGGPENN on 10-30-2007

11-01-2007 10:55 AM
by GREGGPENN

17

1,231

C4 Tech/Performance

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

fuel filter clogged

plaidside on 08-11-2007

08-12-2007 07:40 PM
by mechron

4

632

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 02-26-2007

07-14-2007 07:32 PM
by qwiketz

53

6,201

C4 Tech/Performance

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

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

1stvette94 on 12-14-2006

02-10-2007 02:30 PM
by Jim McCombe

18

4,851

C4 Tech/Performance

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

OBD2 Code P2001

kelp on 08-31-2006

09-01-2006 09:49 PM
by kelp

7

1,562

C6 Tech/Performance

1992, 1994, corvette, high, nox, smogging

High NOx when smogging

qwiketz on 08-08-2006

08-09-2006 07:03 PM
by qwiketz

2

636

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 07-29-2006

08-05-2006 07:54 PM
by toptechx6

51

1,845

C4 Tech/Performance

Anyone from a tough Smog State...?

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1 2)

ETM on 07-20-2006

07-31-2006 04:31 AM
by Kalway

37

1,076

C3 Tech/Performance

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

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

XtremeVette on 06-27-2006

06-28-2006 10:56 AM
by Don in Vermont

12

1,336

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 06-08-2006

06-08-2006 08:07 PM
by JoeF95

12

1,032

C4 Tech/Performance

HELP 91 ZR1 NOx too high

vetteboy78 on 05-24-2006

05-25-2006 11:45 AM
by vettl83

3

477

C4 ZR-1 Discussion

Failed Smog! Old cats, maybe? Any suggestions?

jcsr72 on 11-08-2005

11-10-2005 11:13 AM
by jcsr72

19

599

C4 Tech/Performance

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

Can a bad knock sensor cause poor emissions?

Stngray on 10-27-2005

10-28-2005 12:37 PM
by Stngray

3

481

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 09-11-2005

09-11-2005 09:33 PM
by Aggravated4life

6

1,577

C4 Tech/Performance

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

Failed emissions / high Nox

SS409 425HP on 08-17-2005

08-19-2005 12:32 AM
by SunCr

8

888

C4 Tech/Performance

Failed Inspection

delpa on 03-03-2004

03-03-2004 11:52 PM
by zwede

4

745

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 02-10-2004

02-12-2004 03:24 PM
by The Dude

9

2,478

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 01-13-2004

01-13-2004 07:36 PM
by zwede

12

2,260

C3 Tech/Performance

What did I do wrong?

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1 2)

oprahrider on 01-04-2004

01-09-2004 07:37 PM
by jimgessner

30

1,795

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 12-02-2003

12-02-2003 08:43 PM
by AGENT 86

1

1,012

C4 Tech/Performance

additive, chevron, emissions, increase, nox, techron

How can I lower my NOx emissions?

DuceXcreW on 10-18-2003

10-19-2003 10:01 AM
by DuceXcreW

8

1,080

C5 Tech

captain, houston, morgan, nox, performance, pettis

Would someone mind posting a few pics for me

69 N.O.X. RATT on 09-20-2003

09-22-2003 06:12 PM
by 69 N.O.X. RATT

19

643

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 08-29-2003

09-07-2003 09:55 PM
by GS 163

24

1,291

C4 Tech/Performance

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

Octane boosters....any good?

vetteguy75 on 06-24-2003

06-26-2003 02:22 PM
by garagedweller2

17

832

C3 Tech/Performance

NOX high again...

Kale on 05-17-2003

05-18-2003 07:06 PM
by CorvetteZ51Racer

5

584

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 12-09-2002

12-10-2002 08:11 PM
by 69 N.O.X. RATT

5

11,726

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 10-03-2002

10-05-2002 01:03 AM
by 1SLO POK

11

1,978

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 10-03-2002

10-04-2002 09:32 AM
by BeaterShark

6

2,254

C3 Tech/Performance

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

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

Vette9d1 on 06-08-2002

06-08-2002 08:20 PM
by PeteL

6

496

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 03-27-2002

03-29-2002 12:54 AM
by 69 N.O.X. RATT

5

1,529

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 03-14-2002

03-17-2002 01:38 PM
by ksems

41

2,911

C3 Tech/Performance

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

Octane Booster Suggestions.

SprintCarDriver on 02-28-2002

03-01-2002 11:50 AM
by SprintCarDriver

11

703

C3 Tech/Performance

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

Just failed IM240

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1 2)

91Yellow1 on 01-28-2002

01-29-2002 07:10 PM
by CFI-EFI

23

1,157

C4 Tech/Performance

NOX on L98

Finland on 09-18-2001

09-29-2001 02:24 PM
by Finland

6

515

C4 Tech/Performance

Threads Tagged with nox