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Diesel emissions

Discussion in '1982-Present GM Diesel' started by Tybee, Dec 3, 2001.

  1. Tybee

    Tybee 1/2 ton status

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    Just got my plate renewal and found out I have to get an emission test yearly this sucks when gasoline, 82 and newer you have to get it tested every 2 years. Any one else out there in Colorado that got a diesel e-test done recently? And how much it cost.

    1984 GMC Jimmy 379 diesel, 700R4, 3.73s, 31x10.50 x 15
     
  2. Danno

    Danno 1/2 ton status

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    My truck got tested before I bought it, so I haven't done it yet.

    I'm interested in what's done during testing before I have to take mine back in next spring.

    1984 K5 Blazer 4x4 Silverado
    6.2L diesel, 700R4, 3.42 gears, 31x10.5" tires
     
  3. Tybee

    Tybee 1/2 ton status

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    Mine to, I bought it from a dealer.

    1984 GMC Jimmy 379 diesel, 700R4, 3.73s, 31x10.50 x 15
     
  4. doubleaught

    doubleaught Registered Member

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    I had mine done last month. They run the truck on a chassis dyno and run it up to speed. I think it was around 45MPH. They measure the opacity of the exhaust. Mine was around a 6, which the guy said was normal for a naturally aspirated engine. I was suprised it passed, it looked to me like it was blowing a lot of white smoke. The guy wouldn't tell me what the legal limit for the opacity was.

    It is a YEARLY test, and it costs around 50 dollars. That really sucks. There is no free retest, you have to pay for it again.

    Only 6 more tests, then it's time for collector plates.

    <font color=red>When in doubt, empty the magazine.</font color=red>

    1983 K5 Blazer Silverado, 6.2L Diesel, 700R4, D44 front, 14-bolt FF rear, 37x12.5x16.5 SSRs
     
  5. Danno

    Danno 1/2 ton status

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    Do they check for emissions stuff under the hood, or do they only care about that exhaust test?

    1984 K5 Blazer 4x4 Silverado
    6.2L diesel, 700R4, 3.42 gears, 31x10.5" tires
     
  6. Tybee

    Tybee 1/2 ton status

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    Hey, thanks forthe info. Im kinda worried cause i can really make a smoke screen when I gun it.

    1984 GMC Jimmy 379 diesel, 700R4, 3.73s, 31x10.50 x 15
     
  7. 4x4_76

    4x4_76 1/2 ton status

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    I wish that DMW here would do the diesel emission test like it's done there in the states.Here it's total butchery;engine is revved to the limiter,and the amount of black smoke is measured.Limits are 2,5 for naturally aspirated and 3 for charged.The way test is done just don't make any sense.Especially with autotranny in normal use engine is hardly ever reved to limiter,at least in my use.There are a few engines that are legally free of testing,they simply blow their guts out.
    Test is done yearly at the safety inspection.In the past it was possible to do test in shop that knew how it's done without braking the engine,but the DMW guys don't care about that.I've lost two 5.7 DX engines after test(crappy engine anyway),but I wasn't able to prove that test caused engine failure.This year law was changed so that DMW does the test even if it's already done in other place.

    I'm too lazy to stick shift,that's why I prefer autotranny.
     
  8. doubleaught

    doubleaught Registered Member

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    I don't know what he looked at under the hood, but he did open it. I went to a place on West Colfax that does Volvo and Mercedes repairs mostly. It smoked while they were running it (I thought it was going to fail, but it didn't), then something came flying out of the exhaust! I don't know what it was, but it hit the fan they put behind the truck to blow away the exhaust and exploded. I couldn't find any pieces to see what it was. Maybe it was a rock that was in the hose they put over the tail pipe.


    <font color=red>When in doubt, empty the magazine.</font color=red>

    1983 K5 Blazer Silverado, 6.2L Diesel, 700R4, D44 front, 14-bolt FF rear, 37x12.5x16.5 SSRs
     
  9. Danno

    Danno 1/2 ton status

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    LOL! That's some serious carbon deposits!

    Well, rats. Guess I'll have to buy a new EGR valve before next summer. Mine likes to stick wide open, and it'll lay down enough smoke to suffocate a city bus when I get on it. Disconnected the EGR and plugged the hose, and now I get absolutely no smoke whatsoever, and the truck runs great.

    1984 K5 Blazer 4x4 Silverado
    6.2L diesel, 700R4, 3.42 gears, 31x10.5" tires
     
  10. pcorssmit

    pcorssmit 1/2 ton status

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    Diesel emmisions testing in CO is a serious scam. Used to be a $45 limit, cost me $55 this year. Found one place that was 50, a couple at 65, one over 70. The place I went to was around the 1800 block of west Mississippi, kinda dumpy looking but they were nice and I didn't have to wait or make an appointment.

    My old 6.2 didn't have an EGR valve, never had a problem passing (I think it was removed by a previous owner). I was pretty worried the last time I tested it, so I took some precautions.

    Changed the oil, it burned enough that I was running 20-W50 in it, this time I put in a quart of 80-90 and filled it up with 20-50 (however I was pulling the motor a few weeks afterwards anyways). Also, leave it 1 quart low if it burns a lot (add it after the test). I also put a throttle stop on the linkage, so you couldn't floor it all the way. Then I put a new air filter in it (which can have a big effect).

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  11. Danno

    Danno 1/2 ton status

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    Interesting info. I'll have to post back here in June to find out where everyone in the Denver area goes to get their diesels tested, and which places give the least hassle.

    Thanks!

    1984 K5 Blazer 4x4 Silverado
    6.2L diesel, 700R4, 3.42 gears, 31x10.5" tires
     
  12. Tybee

    Tybee 1/2 ton status

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    Thanks for the info, did yours pass? an did they tell you the limits?

    1984 GMC Jimmy 379 diesel, 700R4, 3.73s, 31x10.50 x 15
     
  13. pcorssmit

    pcorssmit 1/2 ton status

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    I've never failed a diesel E-test. I think they told me the limit on my Blazer was 40, I was much lower (however this was several years ago before I went gas, my #s may be off). I tested the Blazer at Progressive, then went there last year for the Dodge, looked elsewhere this year due to price and time constraints. There is a new shop in Castle Rock, just off Wolfensberger, that seems pretty nice, don't know what they charge for a test, but they hosted a dyno day for the Dodge diesel club in town (RMTDR).

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     

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