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Old 07-26-2010, 02:45 PM
whunter's Avatar
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,387

Originally Posted by okyoureabeast View Post
Emissions exempt in PA.

So what was the consensus? I was under the impression that state/federal laws can't be retroactive in their emissions testing. This meaning that if there wasn't an emissions test in 1985 then the Fed/state governments can't do anything.

Has this changed? It sounds more like newer regulations are being poorly applied to older vehicles.
US and/or State laws can NOT be retroactive in their emissions testing.
This means that your vehicle only needs to meet the emission standard existing at Date of Manufacture...

California has wasted more than a Billion dollars trying to FORCE emission standards to be retroactive!!!

The US supreme court and US district court have overturned every California state law, CARB and state supreme court ruling on this subject.

There are always some un-informed people trying to force antique cars to meet newer regulations.

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Old 07-30-2010, 03:26 AM
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Join Date: Mar 2008
Location: Kent, WA
Posts: 1,189
Well, FWIW, I did everything I described above PLUS mixed 4 gallons of clean new veggie oil with 1-1/2 quarts RUG and dumped it into my front tank - which only had a couple gallons of D2 left in it. Then I said a little prayer and took it down to the testing station. God must've heard my prayer, because I passed the opacity test, but just BARELY. If I hadn't done every single thing that I did, I'm sure it wouldn't have passed, it was THAT close...

Thankfully I never have to smog that truck again.
1984 300 Coupe TurboDiesel
Silver blue paint over navy blue interior
2nd owner & 2nd engine in an otherwise
99% original unmolested car
~210k miles on the clock

1986 Ford F250 4x4 Supercab
Charcoal & blue two tone paint over burgundy interior
Banks turbo, DRW, ZF-5 & SMF conversion
152k on the clock - actual mileage unknown
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Old 07-30-2010, 03:48 AM
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Join Date: Oct 2009
Posts: 105
Utah does an opacity test on all diesels. I think the requirement is 20%. My sd came out with something like 5-8% I think, the paper is in the car, will check tomorrow. Fresh rebuilds are nice ;-) As a side note- the guy who jacked up my car for the "safety inspection" raised the front with the tie rod. I politely showed him the rubber pad jack points. On the plus side I got a new tie rod out of it.
1982 300SD 180K, rebuilt engine
1973 450SLC Megasquirt
1990 Volvo 780 - 273k
1993 Volvo 240 Wagon - Scrap yard slumber
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Old 07-30-2010, 07:54 AM
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Join Date: Jun 2010
Location: MD
Posts: 202
Before I bought the 300D, I thought diesels were exempt from emissions testing here in Connecticut. Last time I checked, they WERE exempt (though admittedly that was probably 10 or more years ago). Imagine my surprise when I went to register the car and was informed that not only did it have to be tested, only "special" facilities scattered around the state could test diesels. The nearest one to me is a couple of towns away.

'87 300D Anthracite
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Old 07-30-2010, 08:17 AM
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Join Date: Jun 2008
Location: Vermont
Posts: 1,143
My MB's and Cummins are exempt in Vermont but the TDI which is newer and has an OBD port is tested. I think if it is post 1996 with the OBD port,, it is tested.
1981 240D 143k 4 spd manual -SOLD

2004 VW Jetta TDI 5 speed 300k -still driven daily
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Old 07-30-2010, 05:07 PM
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Location: Alexandria, Virginia
Posts: 5,480
So far, here in Northern Virginia, only OBDII equipped, '96 and newer Diesels are tested.

Happy Motoring, Mark
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Old 07-31-2010, 08:57 PM
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Join Date: May 2010
Location: ct
Posts: 110
I am also unfortunate enough to live in ct. I failed my test but I had the whole world working against me. First of all I got stuck in traffic on the way there so I didnt have time to run the car out. Second they made me wait for about an hour before pulling the car in. Third the pecker head that did my test thought it would be cool and stand on the accelerator and blow coal all the way to the test bay. A to top it all of I have a 1990 300d 2.5 that only makes boost on the rare ocation it feels like it. It wasn't a good day.
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Old 07-31-2010, 10:06 PM
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Join Date: Jul 2010
Location: Hamilton Ontario Canada
Posts: 394
up here in Ontario Canada, any passenger vehicle 1989+ must be tested. All commercial vehicles must be tested. All diesels are only tested for opacity. Cars are only give a visual test at idle!

As far as the original question, about non functioning egr valve, if it passes the visual you should be fine.

Recirculating the exhaust, which is void of oxygen, back into the intake displaces the incoming, oxygen rich air. The result of this is lower cylinder temperatures (less oxygen = less heat) to prevent / lessen the formation of Nitric Oxide (smog) while maintaing the compression ratio.

EGR has nothing to do with "reburning" the exhaust. The exhaust, for the most part anyway, is already burnt (yes I realize not totaly, lets not get more off topic here) The amount of recirculated exhaust is very small compared to the total exhaust flow, "reburning" that small amount would make no difference anyway.

If you only need to pass an opacity test, you will be fine! if anything, less egr = less particulates (smoke)

If they measure the actual gasses emitted, you may need to be concerned.

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