The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 06-22-2017, 03:17 PM   #1
Malo83
Cruzzzn' Vet
 
Malo83's Avatar
 
Join Date: Jan 2005
Location: Porterville,Ca.
Posts: 1,918
Passed Smog

Just did my smog test and she passed, only low point was the HC (PPM)
Max AVG MEAS
135 73 120
Did a complete tune up, cap/rotor, plugs, filters and oil change. did a high speed run down the highway prior to taking it in, tech said it was passing unburnt fuel causing the high reading, possibly my Cat starting to go bad?

Last edited by Malo83; 06-22-2017 at 04:28 PM.
Malo83 is offline   Reply With Quote
Old 06-22-2017, 03:33 PM   #2
SunSoaked
Registered User
 
SunSoaked's Avatar
 
Join Date: Dec 2011
Location: Yuma Arizona
Posts: 1,525
Re: Passed Smog

Bi-annual? Let's hope you don't have to go thru that routine every 6 months. That could get expensive.
SunSoaked is offline   Reply With Quote
Old 06-22-2017, 04:13 PM   #3
kwmech
Senior Member
 
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,393
Re: Passed Smog

Where was the CO reading?
kwmech is offline   Reply With Quote
Old 06-22-2017, 04:20 PM   #4
Malo83
Cruzzzn' Vet
 
Malo83's Avatar
 
Join Date: Jan 2005
Location: Porterville,Ca.
Posts: 1,918
Re: Passed Smog

Quote:
Originally Posted by SunSoaked View Post
Bi-annual? Let's hope you don't have to go thru that routine every 6 months. That could get expensive.
Every other year
Malo83 is offline   Reply With Quote
Old 06-22-2017, 04:22 PM   #5
Malo83
Cruzzzn' Vet
 
Malo83's Avatar
 
Join Date: Jan 2005
Location: Porterville,Ca.
Posts: 1,918
Re: Passed Smog

Quote:
Originally Posted by kwmech View Post
where was the co reading?
max
.95
avg
.20
meas
.50
Malo83 is offline   Reply With Quote
Old 06-22-2017, 04:34 PM   #6
Matt Man
Registered User
 
Matt Man's Avatar
 
Join Date: Oct 2009
Location: Buhl, Idaho
Posts: 1,438
Re: Passed Smog

Always a sigh of relief, mine barely passed this year my NOX was about 10ppm under the max, running too lean I think. When I got it back home I turned the screws out some more.
__________________
86 c30 crew cab dually 454/400 4/6 drop SOLD 1-8-11
1981 chevy K10 short Bed Scottsdale SOLD 10-26-2020
67 GMC Stepside Straight six/3 on the tree "The Peach"
2020 Silverado Double Cab LT Z71 5.3 8 speed Daily Driver

K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934

The Peach build http://67-72chevytrucks.com/vboard/s...d.php?t=733903



Matt Man is offline   Reply With Quote
Old 06-22-2017, 04:59 PM   #7
Malo83
Cruzzzn' Vet
 
Malo83's Avatar
 
Join Date: Jan 2005
Location: Porterville,Ca.
Posts: 1,918
Re: Passed Smog

Quote:
Originally Posted by Matt Man View Post
Always a sigh of relief, mine barely passed this year my NOX was about 10ppm under the max, running too lean I think. When I got it back home I turned the screws out some more.
You ain't kidding, a big sigh of relief, my Nox was below avg.
Malo83 is offline   Reply With Quote
Old 06-23-2017, 01:18 AM   #8
kwmech
Senior Member
 
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,393
Re: Passed Smog

Quote:
Originally Posted by Malo83 View Post
max
.95
avg
.20
meas
.50
Nothing wrong with the convertor, CO is fuel delivery and HC is the engines ability to burn that fuel. With those readings I wouldn't worry about it. If you go in next week when the heat wave is over, you'll get entirely different readings. What vehicle and engine we talking about?
kwmech is offline   Reply With Quote
Old 06-23-2017, 11:07 AM   #9
abig84
Registered User
 
abig84's Avatar
 
Join Date: Jan 2017
Location: wheaton IL
Posts: 659
Re: Passed Smog

I only had one square body ever pass emissions and it was as close as I could get to failing. I eventually just started plating them where there was no emissions
abig84 is offline   Reply With Quote
Old 06-23-2017, 02:14 PM   #10
Malo83
Cruzzzn' Vet
 
Malo83's Avatar
 
Join Date: Jan 2005
Location: Porterville,Ca.
Posts: 1,918
Re: Passed Smog

[QUOTE=kwmech;7974278]Nothing wrong with the convertor, CO is fuel delivery and HC is the engines ability to

83 Silverado, 305, 5.0
Malo83 is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 01:12 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com