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10-28-2016
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#1 |
 Join Date: Oct 2010
Location: NV
Posts: 38
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Failed emissions
94 zr1 with haibeck top end work. Headers, no cats.
Passed everything except the hc at idle. Allowable limit is 220. Tested 3 times, read 561, 260, and 461. Car sat for two years, I think I've run most of the bad gas through it, currently on second tank of fresh gas, added fuel system cleaner to both fill ups. Only issue with the way it runs is an off-idle stumble. Ideas? Thanks, Jack
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Reno, NV |
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10-28-2016
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#2 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Failed emissions
move to another state
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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10-28-2016
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#3 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Failed emissions
probably a tune someone could do for the test
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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10-28-2016
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#4 |
  
Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: Failed emissions
Injectors going bad?
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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10-28-2016
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#5 |
Join Date: Feb 2006
Location: San Antonio area
Posts: 1,179
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Re: Failed emissions
put cats on it
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“Buy the best example of what you want, and pay whatever it takes. That way, you cry only once.” ~ Bruce Meyer |
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10-28-2016
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#6 |
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Join Date: Oct 2010
Location: NV
Posts: 38
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Re: Failed emissions
Well, yeah, putting the cats back on is the obvious solution, but I've seen posts where they've passed without them. And it's fine at higher rpms. I'm thinking its related to letting the car sit. The way it acts from zero throttle to a little bit open, if it was carburator, I'd look at the accelerator pump. I don't know what the equivalent to that is with fuel injection. Was hoping to hear from someone very familiar with the fueling systems and what might be causing it to run rich just at idle. The car has only 19,000 miles, new plugs were put in about 2,000 miles ago. I hate to go the effort and expense replacing the injectors and then discover it doesn't run any differently. The secondaries are wired open, if that makes any difference.
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Reno, NV |
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10-29-2016
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#7 |
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Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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Re: Failed emissions
The tune is adding fuel and timing which will raise emissions, but you could still pass if you had the oem cats. Not having cats with a chip...you don't have a prayer. At least put a stock chip in it.
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10-29-2016
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#8 | |
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Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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Re: Failed emissions
Quote:
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10-29-2016
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#9 |
 
Join Date: Feb 2012
Location: Ledyard,CT
Posts: 8,258
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Re: Failed emissions
Replace cats
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10-29-2016
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#10 | |
 
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: Failed emissions
Quote:
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director  91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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