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Bad Emissions
03-02-2007, 01:33 AM
Post: #1
Sad Bad Emissions
I have a '93 G20 and it failed emissions, hoping someone could help. It failed on two, the HC (tested 2.0324) and the NOx (4.5802). I was told it could be the catalyctic (sorry, i can't spell) converter, and i should change the spark plugs, any other suggestions?
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03-02-2007, 03:25 PM
Post: #2
RE: Bad Emissions
Sounds like a cat. conv. will take care of it. Spark plugs would be a good idea also. One more thing, check the ignition timing. High timing can cause high Nox. I beleive that year and model has an adjustable dist.

Cary Joe York
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03-02-2007, 08:07 PM
Post: #3
RE: Bad Emissions
Ok, thank you! I just dont want to get to a shop and have someone tell me i have to do more than i need too.


CaryJoeYork Wrote:Sounds like a cat. conv. will take care of it. Spark plugs would be a good idea also. One more thing, check the ignition timing. High timing can cause high Nox. I beleive that year and model has an adjustable dist.
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03-02-2007, 09:42 PM
Post: #4
RE: Bad Emissions
What about the EGR valve for NOX??

Being way2old is why I need help from younger minds.



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03-02-2007, 10:11 PM
Post: #5
RE: Bad Emissions
Yes, you may want to verifiy EGR operation. But since the HC was high also, the cat. will help clean that up a liitle as well. If you had a inferred heat gun that measured surface temp., you can measure the inlet and outlet temp of the cat. The outlet should be 100F or more vs. the inlet. My theory is this, EGR operation can raise HC slighty. And of course low NoX. But if this were just a EGR problem, you may solve the NoX problem but in-turn raise the HC even more. But the safest thing to do is to verifiy EGR operation and if possable check cat. temp. If not replace cat. Of course thats my opinion, but I could be wrong. That line is from The Dennis Miller Show. It would help to know the Co reading. I will get back on this later.

Thanks for all the input.

Cary Joe York
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03-02-2007, 11:25 PM
Post: #6
RE: Bad Emissions
Wow, way more help than i thought i'd get. Thanks so much! the Co reading was 11.9804 and the CO2 was 300.7112.
Petra
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03-03-2007, 12:46 PM
Post: #7
RE: Bad Emissions
What are the allowables were you are at for HC, CO, and NoX?

Cary Joe York
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03-03-2007, 02:51 PM
Post: #8
RE: Bad Emissions
Standard Units are:
HC - 0.8000 (my reading - 2.0324)
CO - 15.0000 (11.9804)
NOx - 2.000 (4.5802)
CO2 - my reading was 300.7112 and its only an advisory, doesn't affect my pass/fail.

You guys are great. Thanks again, you've been so helpful!
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03-03-2007, 08:21 PM
Post: #9
RE: Bad Emissions
Given the CO readings I am going to drop back and punt. I would look to get the CO lower first. Even though it did not fail, it is high and lowering it will help the HC. Then as way2old said, check the EGR flow. And ignition timing. The higher than normal CO may be a lazy O2 sensor. You still may need a cat. But the only way to test for sure is to retest or check the inlet and outlet temp.

Cary Joe York
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03-03-2007, 11:51 PM
Post: #10
RE: Bad Emissions
Ok, will do, and thank you.
Petra
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