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03-26-2020
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#1 |
Join Date: Dec 2007
Location: Fremont,Ca
Posts: 3,078
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Any new tips on passing smog test?
Last time I got a smog check it was pretty close to the max Nox level even though the cars only got 25,000 miles. Other than a K&N air filter and open housing it’s bone stock. I’ve got a little help from our friend Mr. H,any other tips I should look into,stock air box or open housing,low power mode at the valet switch? I’m thinking about running e85 just to be on the safe side. Thanks for any help here.
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03-26-2020
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#2 |
 
Join Date: Jan 2004
Location: Vancouver Washington
Posts: 238
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Re: Any new tips on passing smog test?
Hello,
To smog my ZR1, I drove on the freeway in 4th gear for a couple miles. Then I got off freeway and drove it 3 gear to the Smog station and she passed each time. In the stste of Washington. Manfred E... 91 #906 |
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03-26-2020
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#3 |
 
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Any new tips on passing smog test?
I wouldn’t change anything of your setup. Valet mode only, remove the key for the test itself. Get the cats good and hot immediately before you take it in by running it hard for half an hour or so. A fresh oil change can help with hydro carbon readings. These cars sit so much, getting started and stopped constantly without much driving. The cats get loaded up and need to be blown out occasionally. Beyond that hope for the best. Not sure about the E85.
H 
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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03-27-2020
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#4 |
 
Join Date: Dec 2019
Location: st louis mo
Posts: 749
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Re: Any new tips on passing smog test?
run some seafoam through it with a quarter tank of gas, a dirty combustion chamber isnt helping, then run some super in it, then do what the rest say- maybe some octain booster also, hot flashes to heat up converters
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03-27-2020
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#5 |
Join Date: Apr 2007
Location: Northern VA
Posts: 2,661
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Re: Any new tips on passing smog test?
I’ve had good results cleaning out combustion chamber deposits with running a tank of gas through mixed with Chevron Techron Concentrate Plus Fuel System Cleaner.
Sent from my iPhone using ZR-1 Net Registry
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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03-27-2020
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#6 | |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Any new tips on passing smog test?
Quote:
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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03-27-2020
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#7 | |
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Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Any new tips on passing smog test?
Quote:
H
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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03-28-2020
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#8 |
 Join Date: Feb 2011
Location: Clayton, North Carolina
Posts: 1,133
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Re: Any new tips on passing smog test?
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Lou[COLOR="Red"][B][SIZE="4"][/SIZE][/B][/COLOR] |
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03-28-2020
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#9 |
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Join Date: Jun 2019
Location: Wisconsin
Posts: 10
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Re: Any new tips on passing smog test?
Don't use E85 it will only mess a lot of things up. These cars were not designed to run E85 and the components are not compatible to it.
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Greg 1990 Red on Red, ZR-1 #2973 :Eagle: |
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03-29-2020
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#10 | |
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Join Date: Dec 2003
Posts: 477
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Re: Any new tips on passing smog test?
Quote:
George. |
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