Emissions test - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ckenwright · 06-04-2003, 05:48 PM

I tried to get my truck emission tested yesterday and it failed. Apparently I was running a little rich. Max HC allowed was 4.00 at 2500 RPM and I was running at 4.03. At idle max I was running 4.63. Go figure.

68_c10_on20s · 06-04-2003, 06:03 PM

if your truck is a 67-72 it should be exempt i know they are here in houston hell i could have a blown 502 in my truck no prob if only i had the mulah...Steve

ckenwright · 06-04-2003, 06:06 PM

I have had the truck for about 5 years now and have lived in Texas, New Mexico, Arizona, and Nevada. This is the first state I have been to that I have had to test it. You are only exempt in Nevada if it is 67 or older.

68_c10_on20s · 06-04-2003, 07:47 PM

look above...man that erally does suck big time

ckenwright · 06-04-2003, 08:11 PM

68_c10_on 20's

What town do you live in- in Texas? I'm originally from Dallas which is where this truck was bought new.

68_c10_on20s · 06-04-2003, 08:35 PM

I live in Cypress its like a Houston suburb about 5 minutes away

Longhorn Man · 06-04-2003, 10:45 PM

Lean it out a bit, a new air filter and fresh plugs and a little messing witht eh carb adjustments will go a long way on the sniffer.

*Phillip Johnson* · 06-05-2003, 04:07 AM

Nothing in Grants Pass Oregon needs to be smogged. My New Yukon is exempt. My 72 and my motorhome is also... In Calif, they exempted everything 73 and older.

ddsmith · 06-05-2003, 04:18 AM

That's pretty sad. I think it's a ricer plot to rid the streets of all the really cool rides so they will get more attention. I find it hard to believe that we allow this to happen. For crying out loud, these trucks didn't even know what emission controls were when they were made. Except for the token California trucks. They don't perform these checks for free. You pay for them and the government gets bigger. The idiots that work here doing emission check don't even look like they can tie there shoes. The bad thing is I have to allow them to drive my vehicle on a tread mill and they suck at it. They can't keep the speed where it needs to be so the test takes forever.

Blue Beard · 06-05-2003, 08:40 AM

Change the oil before being tested.....

tom hand · 06-05-2003, 08:41 AM

If you are happy with the way it runs and you don't want to mess with the carb try this. Create an intentional vacuum leak. Should lean it out enough to pass the test. Just dissconnect a small vacuum hose or remove a plug on a manifold vacuum. It needs to be a small one or the drop in vacuum will cause the carb to go into the power circuit and make it even worse. Have fun!

68_c10_on20s · 06-05-2003, 09:30 AM

what really sucks is they do these test and WONT even give you your rwhp thats what pisses me off i know that machine will tell em,hell it would be worth the 49 bucks then huh....just my 3 cents

Mixup · 06-05-2003, 10:28 AM

ckenwright, I live in Henderson and my truck always had a problem passing. I retard the timing and turn the idle mixture screws in until it just about runs and it passes everytime. I just put Classic Rod plates on my truck and I don't have to get tested anymore as long as I don't drive more then 2500 a year. If I get close I'll disconnect the speedometer.

Bill72BB · 06-05-2003, 10:36 AM

Note to self don't move to Nevada.

VTKidder · 06-05-2003, 10:53 AM

Vermont, does smog tests on certain vehicles, but with our older trucks, they're exempt. If it had a converter on it from the factory, it has to have one to get inspected. That's about the only rule.

Green72GMC · 06-05-2003, 10:59 AM

Those tests suck. None of the inspection stations do it in this town on the newer vehicles anyway. They just do the horn, lights, and few other things, I've seen people run straight pipes and pass.

TooMany2count · 06-05-2003, 11:57 AM

Simply change the plugs(if it needs them), oil & filter, pull air cleaner out, & then remove PCV from valve cover & just let it lay on top of it. what this will do is, bring cleaner air into the motor. the oil is contaminated with gasoline, which will make you have HIGH HC's so change it. Removing the air cleaner & the PCV will also allow more clean air into your motor. My 84 Burb flunked big time too because of HIGH HC's & a emissions guy I know told me to do these things & I passed w/flying colors. As long as it says you PASSED, thats all they care about...joe

Chevyguy111786 · 06-05-2003, 02:59 PM

In Texas, the law is if your vehicle is 25 years or older you only have to have safety inspection. This is what i have always heard. Check with your laws for Houston. I think an inspection station is tryin to make a quick buck. Our 89 Isuzu Pickup failed 3 times....for stupid stuff. 1st time for a plug in the tire...they couldn't put it on the dyno. 2nd time they wouldn't put it on the dyno because the tail light lense had a crack in it. 3rd time it actually failed on the dyno. Took it to our mechanic and he couldn't figure out why it failed. So he gave us a sticker. But check the laws because i know in North Texas you only have to have inspection. It'd be worth a search or to on the internet or a phone call.

krue · 06-05-2003, 03:40 PM

Emissions, what's that!

Just another reason to live in Mississippi!

ckenwright · 06-05-2003, 04:02 PM

Since I am in the Air Force I have to register my truck on base. In order to get my truck registered, I have to comply with state law even though I have out-of-state tags. They tell me I have to do smog my truck so I have to smog it.

Thanks for all the input, I think I am going to put a dwell meter on it, adjust the timing and give it a tune-up after I adjust the carb. Then maybe for safe measure I will take out the filter before I smog it.

06-04-2003, 05:48 PM	#1
ckenwright Registered User Join Date: May 2003 Location: Phoenix, AZ Posts: 104	Emissions test I tried to get my truck emission tested yesterday and it failed. Apparently I was running a little rich. Max HC allowed was 4.00 at 2500 RPM and I was running at 4.03. At idle max I was running 4.63. Go figure.

06-04-2003, 06:03 PM	#2
68_c10_on20s Registered User Join Date: Aug 2002 Location: Waxahachie TX Posts: 773	test if your truck is a 67-72 it should be exempt i know they are here in houston hell i could have a blown 502 in my truck no prob if only i had the mulah...Steve __________________ 93 Fleet Budget Build http://s150.photobucket.com/albums/s...zted71/hoopty/

06-04-2003, 07:47 PM	#4
68_c10_on20s Registered User Join Date: Aug 2002 Location: Waxahachie TX Posts: 773	that law blows!!!! look above...man that erally does suck big time __________________ 93 Fleet Budget Build http://s150.photobucket.com/albums/s...zted71/hoopty/

06-04-2003, 08:35 PM	#6
68_c10_on20s Registered User Join Date: Aug 2002 Location: Waxahachie TX Posts: 773	city I live in Cypress its like a Houston suburb about 5 minutes away __________________ 93 Fleet Budget Build http://s150.photobucket.com/albums/s...zted71/hoopty/

06-05-2003, 04:18 AM	#9
ddsmith Glowing since 1978 Join Date: Mar 2001 Location: Lusby,MD,USA Posts: 532	That's pretty sad. I think it's a ricer plot to rid the streets of all the really cool rides so they will get more attention. I find it hard to believe that we allow this to happen. For crying out loud, these trucks didn't even know what emission controls were when they were made. Except for the token California trucks. They don't perform these checks for free. You pay for them and the government gets bigger. The idiots that work here doing emission check don't even look like they can tie there shoes. The bad thing is I have to allow them to drive my vehicle on a tread mill and they suck at it. They can't keep the speed where it needs to be so the test takes forever. __________________ 66 Chevy C30 Stakebody Dump, PS,PB, 327cu in 71 Corvette Coupe 454 4 speed 69 Chevy C20 Custom Camper

06-04-2003, 06:06 PM	#3
ckenwright Registered User Join Date: May 2003 Location: Phoenix, AZ Posts: 104	I have had the truck for about 5 years now and have lived in Texas, New Mexico, Arizona, and Nevada. This is the first state I have been to that I have had to test it. You are only exempt in Nevada if it is 67 or older.

06-04-2003, 08:11 PM	#5
ckenwright Registered User Join Date: May 2003 Location: Phoenix, AZ Posts: 104	68_c10_on 20's What town do you live in- in Texas? I'm originally from Dallas which is where this truck was bought new.

06-04-2003, 10:45 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Lean it out a bit, a new air filter and fresh plugs and a little messing witht eh carb adjustments will go a long way on the sniffer.

06-05-2003, 04:07 AM	#8
Phillip Johnson Account Suspended Join Date: Apr 2000 Location: Grants Pass, Oregon Posts: 1,580	Nothing in Grants Pass Oregon needs to be smogged. My New Yukon is exempt. My 72 and my motorhome is also... In Calif, they exempted everything 73 and older.

06-05-2003, 08:40 AM	#10
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,834	Change the oil before being tested..... __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

06-05-2003, 08:41 AM	#11
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	If you are happy with the way it runs and you don't want to mess with the carb try this. Create an intentional vacuum leak. Should lean it out enough to pass the test. Just dissconnect a small vacuum hose or remove a plug on a manifold vacuum. It needs to be a small one or the drop in vacuum will cause the carb to go into the power circuit and make it even worse. Have fun! __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

06-05-2003, 09:30 AM	#12
68_c10_on20s Registered User Join Date: Aug 2002 Location: Waxahachie TX Posts: 773	dyno??? what really sucks is they do these test and WONT even give you your rwhp thats what pisses me off i know that machine will tell em,hell it would be worth the 49 bucks then huh....just my 3 cents __________________ 93 Fleet Budget Build http://s150.photobucket.com/albums/s...zted71/hoopty/

06-05-2003, 10:28 AM	#13
Mixup Registered User Join Date: Jan 2002 Location: Henderson, NV Posts: 358	ckenwright, I live in Henderson and my truck always had a problem passing. I retard the timing and turn the idle mixture screws in until it just about runs and it passes everytime. I just put Classic Rod plates on my truck and I don't have to get tested anymore as long as I don't drive more then 2500 a year. If I get close I'll disconnect the speedometer. __________________ 1980 Chevy Shortbed Pickup 1969 Z28 engine Turbo 350

06-05-2003, 10:36 AM	#14
Bill72BB Thats the Hillbilly way Join Date: Jul 2001 Location: Torrance,Ca Posts: 5,980	Note to self don't move to Nevada. __________________ BILL Torrance Calif 90504 Member DUF Club Member Old Farts Club 72 3/4ton Custom Camper BB402/400 trans Dynomax Cerama-coat headers , Hei distributor ,Edelbrock 1411 air,ps,pb,leafsprings ,98 chevy 60/40 seat,S10 shoulder belts tilt,3.54 Dana 60 rear. 16" Eagle wheels with LT265/75 16 tires,Gaylord Lid,H4 headlights with 100W relay conversion. " If I knew I was going to live this long I would have taken better care of myself " Marriage changes passion...suddenly you're in bed with a relative. A GUY'S PRAYER.... Lord, I pray for a nympho with huge boobs who owns a liquor store and likes to fish and hunt and has a Harley .Amen ,

06-05-2003, 10:53 AM	#15
VTKidder Registered User Join Date: May 2003 Location: Vermont Posts: 996	Vermont, does smog tests on certain vehicles, but with our older trucks, they're exempt. If it had a converter on it from the factory, it has to have one to get inspected. That's about the only rule.



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06-05-2003, 10:59 AM	#16
Green72GMC Registered User Join Date: Apr 2003 Location: Deville, Louisiana Posts: 293	Those tests suck. None of the inspection stations do it in this town on the newer vehicles anyway. They just do the horn, lights, and few other things, I've seen people run straight pipes and pass. __________________ 1972 GMC SWB, 305 powered 1980 diesel VW pickup, Needs a Heart Transplant 1997 Toyota Taco The Second Amendment is in place incase they ignore the others.

06-05-2003, 11:57 AM	#17
TooMany2count Who's in CHARGE?????????? Join Date: Nov 2002 Location: Cahokia, IL Posts: 455	Simply change the plugs(if it needs them), oil & filter, pull air cleaner out, & then remove PCV from valve cover & just let it lay on top of it. what this will do is, bring cleaner air into the motor. the oil is contaminated with gasoline, which will make you have HIGH HC's so change it. Removing the air cleaner & the PCV will also allow more clean air into your motor. My 84 Burb flunked big time too because of HIGH HC's & a emissions guy I know told me to do these things & I passed w/flying colors. As long as it says you PASSED, thats all they care about...joe __________________ Send a card to a soldier in Iraq My Music PlayList Large Marge Donate Blood,Plasma,Platelets & sign your DONORS CARD & SAVE a LIFE

06-05-2003, 02:59 PM	#18
Chevyguy111786 Registered User Join Date: Apr 2003 Location: Garland, Texas Posts: 1,127	In Texas, the law is if your vehicle is 25 years or older you only have to have safety inspection. This is what i have always heard. Check with your laws for Houston. I think an inspection station is tryin to make a quick buck. Our 89 Isuzu Pickup failed 3 times....for stupid stuff. 1st time for a plug in the tire...they couldn't put it on the dyno. 2nd time they wouldn't put it on the dyno because the tail light lense had a crack in it. 3rd time it actually failed on the dyno. Took it to our mechanic and he couldn't figure out why it failed. So he gave us a sticker. But check the laws because i know in North Texas you only have to have inspection. It'd be worth a search or to on the internet or a phone call.

06-05-2003, 03:40 PM	#19
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Emissions, what's that! Just another reason to live in Mississippi! __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

06-05-2003, 04:02 PM	#20
ckenwright Registered User Join Date: May 2003 Location: Phoenix, AZ Posts: 104	Since I am in the Air Force I have to register my truck on base. In order to get my truck registered, I have to comply with state law even though I have out-of-state tags. They tell me I have to do smog my truck so I have to smog it. Thanks for all the input, I think I am going to put a dwell meter on it, adjust the timing and give it a tune-up after I adjust the carb. Then maybe for safe measure I will take out the filter before I smog it.

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