Any new tips on passing smog test? - ZR-1 Net Registry Forums

Z51JEFF · 03-26-2020

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.

tomcat · 03-26-2020

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

Ccmano · 03-26-2020

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

viper107 · 03-27-2020

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

Jagdpanzer · 03-27-2020

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

-=Jeff=- · 03-27-2020

Quote:

Any new tips on passing smog test?

find a state without smog Nazis and move there

Ccmano · 03-27-2020

Quote:

Originally Posted by -=Jeff=-

find a state without smog Nazis and move there

Given the political nature of that states with the worst emissions laws, it’s probably more appropriate to call them commissar’s than Nazi’s. But then Nazi’s were socialists too...
H

lfalzarano · 03-28-2020

I agree with Jeff! Move!!!

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gapl1953 · 03-28-2020

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.

Corvettes White · 03-29-2020

Quote:

Originally Posted by -=Jeff=-

find a state without smog Nazis and move there

Jeff I need the money, and my kids are here. And I know of no place in the world with the weather.

George.

03-26-2020	#1
Z51JEFF Join Date: Dec 2007 Location: Fremont,Ca Posts: 3,078	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.

03-26-2020	#2
tomcat Join Date: Jan 2004 Location: Vancouver Washington Posts: 238	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

03-26-2020	#3
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	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 __________________ 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.

03-27-2020	#4
viper107 Join Date: Dec 2019 Location: st louis mo Posts: 749	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

03-27-2020	#5
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,661	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 __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

03-28-2020	#8
lfalzarano Join Date: Feb 2011 Location: Clayton, North Carolina Posts: 1,133	Re: Any new tips on passing smog test? I agree with Jeff! Move!!! Sent from my iPhone using ZR-1 Net Registry __________________ Lou[COLOR="Red"][B][SIZE="4"][/SIZE][/B][/COLOR]

03-28-2020	#9
gapl1953 Join Date: Jun 2019 Location: Wisconsin Posts: 10	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. __________________ Greg 1990 Red on Red, ZR-1 #2973 :Eagle:

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