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

**shambles** · 03-30-2023, 11:21 PM

How would I find out what emissions equipment originally came on my truck? It's a 1978 GMC C15. Bought new here in Arizona. The RPO Code says NA2-Standard Emissions system. I only have charcoal canister, and catalytic converters. No smog pump or ports in the exhaust Manifolds. It's a 250 inline 6.

I'm getting ready to go through emissions test for the first time. The truck hasn't been registered in years.

Thanks.

**kwmech** · 03-31-2023, 10:28 AM

I don't have my books anymore that listed equipment required, so you'll have to take a short trip to an inspection station and get a list of requirements from them. Unless somebody else here has that info and it is accurate for your truck and state

Keith Seymore · 03-31-2023, 11:01 AM

.....

https://www.gm.com/content/dam/compa...olet-Truck.pdf

truckin 79 · 03-31-2023, 01:52 PM

Does it still have the emissions sticker on the radiator support? If not I would just make sure EGR is hooked up besides what you already have now. That is what CO goes off of but honestly I do not think these young techs even know what they are looking at when they see a carbureted engine.

**shambles** · 03-31-2023, 02:10 PM

Thanks for the Manual Keith. That helps. It does have that little radiator sticker, but it's faded. I agree though, I'd be surprised if they knew what they were looking at.

03-30-2023, 11:21 PM	#1
shambles Junior Member Join Date: Jul 2010 Location: Goodyear, AZ Posts: 65	Determining Emissions Equipment How would I find out what emissions equipment originally came on my truck? It's a 1978 GMC C15. Bought new here in Arizona. The RPO Code says NA2-Standard Emissions system. I only have charcoal canister, and catalytic converters. No smog pump or ports in the exhaust Manifolds. It's a 250 inline 6. I'm getting ready to go through emissions test for the first time. The truck hasn't been registered in years. Thanks.

03-31-2023, 10:28 AM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,635	Re: Determining Emissions Equipment I don't have my books anymore that listed equipment required, so you'll have to take a short trip to an inspection station and get a list of requirements from them. Unless somebody else here has that info and it is accurate for your truck and state

03-31-2023, 11:01 AM	#3
Keith Seymore Registered User Join Date: May 2009 Location: Motor City Posts: 9,226	Re: Determining Emissions Equipment ..... https://www.gm.com/content/dam/compa...olet-Truck.pdf Attached Images __________________ Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/

03-31-2023, 01:52 PM	#4
truckin 79 Registered User Join Date: Jun 2014 Location: CO Posts: 749	Re: Determining Emissions Equipment Does it still have the emissions sticker on the radiator support? If not I would just make sure EGR is hooked up besides what you already have now. That is what CO goes off of but honestly I do not think these young techs even know what they are looking at when they see a carbureted engine. __________________ 79 Chevy 2wd BIG10 350 TH400

03-31-2023, 02:10 PM	#5
shambles Junior Member Join Date: Jul 2010 Location: Goodyear, AZ Posts: 65	Re: Determining Emissions Equipment Thanks for the Manual Keith. That helps. It does have that little radiator sticker, but it's faded. I agree though, I'd be surprised if they knew what they were looking at.

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