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Emission Test
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jpab
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PostPosted: Tue Jul 23, 2019 4:10 am    Post subject: Emission Test Reply with quote

Took my 74 SB into the Delaware DMV for inspection, and failed the emission test. It already has new plugs, coil, air filter and new cab. Engine was recently rebuilt as well. Don't see any vacuum leaks. So, other than trying to adjust the idle are and lean out the fuel mixture, plus recheck the timing .... another thoughts? ( the failure was high carbon monoxide ... CO and or Hydrocarbon failure)
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bomberbob
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PostPosted: Tue Jul 23, 2019 4:30 am    Post subject: Re: Emission Test Reply with quote

Gross failure, or did you just miss by a few points?
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jpab
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PostPosted: Tue Jul 23, 2019 4:37 am    Post subject: Re: Emission Test Reply with quote

Not sure ... They list three headings;
Readings ... (Blank)
Limits ....... 600 for HC and 6.0 for CO
Results ......Both state "Bypass)
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JonRich55
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PostPosted: Tue Jul 23, 2019 5:19 am    Post subject: Re: Emission Test Reply with quote

The 74 SB should have an EGR system. Is yours installed? I think the law states that emissions components must be present.
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Glenn Premium Member
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PostPosted: Tue Jul 23, 2019 5:27 am    Post subject: Re: Emission Test Reply with quote

JonRich55 wrote:
The 74 SB should have an EGR system. Is yours installed? I think the law states that emissions components must be present.

I'm glad in New York, cars older than 25 years are exempt from emissions testing. Safety inspection only.
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JonRich55
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PostPosted: Tue Jul 23, 2019 5:34 am    Post subject: Re: Emission Test Reply with quote

Glenn, I live in VA, and we also have a 25 year exception for emission I believe. Having said that, I was told by an inspector once that the exception was that my car didn't have to pass the tests, however all emissions related components needed to be on the car for a visual inspection. Even that may have changed over the years.

I cant speak to what DE does, I was just curious if this could be why the OP had his fail.
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Cusser
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PostPosted: Tue Jul 23, 2019 6:11 am    Post subject: Re: Emission Test Reply with quote

Arizona 2 largest counties test back to 1967 model year. No testing at all in remainder of state, and no safety/operational testing...
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jpab
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PostPosted: Tue Jul 23, 2019 6:16 am    Post subject: Re: Emission Test Reply with quote

it does not have an EGR system installed.
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jpab
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PostPosted: Tue Jul 23, 2019 6:22 am    Post subject: Re: Emission Test Reply with quote

So .... I guess I need to figure out how to instal an EGR system.
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vwoldbug
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PostPosted: Tue Jul 23, 2019 7:42 am    Post subject: Re: Emission Test Reply with quote

CO is usually carb related and hydrocarbon is usually ignition related . How long since tune up and oil change . Do they check for missing emission parts . Make sure the dwell and timing are right on and idle is on low side and oil is changed. Can you get a picture of engine compartment. Egr is oxides of nitrogen check . Good luck
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PostPosted: Tue Jul 23, 2019 7:48 am    Post subject: Re: Emission Test Reply with quote

Cusser wrote:
Arizona 2 largest counties test back to 1967 model year. No testing at all in remainder of state, and no safety/operational testing...


Texas used to be the same way. Folks would drive to the next county over and have it inspected there to avoid the emission part of the inspection.
25 year limit here as well.
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Relyt
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PostPosted: Tue Jul 23, 2019 8:08 am    Post subject: Re: Emission Test Reply with quote

Wa state doesnít do emissions after 25 years, and no safety inspections for anyone. As long as the state gets their money they donít care what kind of death trap you drive. To be fair Iíve probably driven vehicles in the past that wouldnít pass a safety inspection.
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PostPosted: Tue Jul 23, 2019 8:14 am    Post subject: Re: Emission Test Reply with quote

Did they give you a printout of the numbers. HC, CO, NOx, O2?

The actual numbers would be great info to have, unless you maxed out their machine.

My guess is you need a good tune up, as already mentioned. While you got the plugs out and after a valve adjust, do a compression test.
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PostPosted: Tue Jul 23, 2019 8:33 am    Post subject: Re: Emission Test Reply with quote

Rebuilt engines often need valve adjustment after short time of running. Had that several times.
If an exhaust valve doesn't fully close this will lead to high CO and HC values.

Otherwise if a cylinder does not fully work (e.g. due to bad ignition) also CO and HC values rise. HC always means unburnt gasoline.

I would not expect a missing EGR to result in high CO and HC.
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JonRich55
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PostPosted: Tue Jul 23, 2019 9:05 am    Post subject: Re: Emission Test Reply with quote

Here is a link that provides exactly what DE requires by age of car.

https://www.dmv.de.gov/services/vehicle_services.old/reg/ve_reg_emissions.shtml

This site appears to have links and information to all states:
https://www.semasan.com/resources/vehicle-emissions-inspection-requirements-and-exemptions-state

I have no idea if Counties have more or less restrictive policies than the state charter.
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jpab
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PostPosted: Tue Jul 23, 2019 9:36 am    Post subject: Re: Emission Test Reply with quote

thanks for all your input ... the engine is just rebuilt with no time on it. I'll check out the items posted ... timing, compression, mixture and let you know how it went. And right, all the DMV did was an idle check as required. Any more thoughts are appreciated.
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bluebus86
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PostPosted: Tue Jul 23, 2019 10:18 am    Post subject: Re: Emission Test Reply with quote

New motors may need to be broken in before rings seal correctly. unsealing rings may cause high HC values, ie burning oil.

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jpab
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PostPosted: Tue Jul 23, 2019 12:32 pm    Post subject: Re: Emission Test Reply with quote

Thanks .... other than making the other checks, Iíll put some more time on the engine break in.
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PostPosted: Tue Jul 23, 2019 12:55 pm    Post subject: Re: Emission Test Reply with quote

High HCs, especially at idle, are usually ignition issues (bad plug wire or connector) CO, well sometimes even a half a turn on the carburetor's idle mixture screw can make a huge difference in that number.
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jpab
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PostPosted: Tue Jul 23, 2019 1:46 pm    Post subject: Re: Emission Test Reply with quote

Thanks Andy .... looks like I have me work cut out for me tomorrow. After making the adjustments and another. Is it to the dmv ... Iíll let all know the outcome. I appreciate all the help and if there are any more suggestions .. wall is welcome.
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