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Anyone here good with emissions stuff?
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goldwinger1984@carjunky.com
New User
Aug 21, 2008, 5:49 PM
Post #1 of 4
(2787 views)
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Anyone here good with emissions stuff?
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Just came back from the emissions test and my 95 Cavalier 2.3L failed. HC and CO were slightly up but NO was through the roof, like 3 times over what it should be. Any tips on what I should be looking for to fix it and make it pass. See attachment for exact stats.
BTW, this is my first time out here and it seems like a really terrific place to hang out and find good info.
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scan0006 (383 x 271).jpg
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way2old
Veteran
/ Moderator
Aug 21, 2008, 5:58 PM
Post #2 of 4
(2782 views)
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Re: Anyone here good with emissions stuff?
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Just tossing ideas as we do not have emission testing here. But usually high Nitrus Oxide indicates a malfunction in the EGR system. Maybe DanD will see this and respond.
Also sucking up by bragging on the site won't help much. It sure won't hurt though.    Welcome to the site and we hope you want to hang out here. SOmetimes we get a little loopy and sort of go off track, but may manage to find it again. Enjoy the site and thanks for the compliment. I am sure the other regulars will agree.
Being way2old is why I need help from younger minds
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DanD
Veteran
/ Moderator
Aug 22, 2008, 4:36 AM
Post #3 of 4
(2777 views)
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Re: Anyone here good with emissions stuff?
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Hi
I’m a repair tech in the Drive Clean program and (as dumb as this sounds) I could be fined and suspended from the program for attempting too diagnose from a test report sheet.
That being said; all I’m going to do is, comment on my observations of the sheet. LOL
The first thing I see is that this 2.3 (quad four) engine doesn’t use an EGR valve. Oxides of Nitrogen (NOx) is controlled by combustion chamber design, computer programming and the catalytic converted.
To see all three gases fail on the ASM portion of the test and the HC (Hydrocarbon) & CO (Carbon Monoxide) pass the Curb idle. I would question whether this engine was properly preconditioned for the test. In other words was the engine allowed to come up to full operating temperature before/during the test?
High HC & CO combination usually means the engine is running rich for some reason; again this points to a cold engine; a cold engine needs extra fuel to run properly.
Let me clear up what I mean, when I say a cold engine, I’m talking anything below 195 degrees, is a cold engine.
The Catalytic converter only begins working after the exhaust has reached 450 degrees; so again if the engine was “cold” the converter wasn’t fired up?
Now if the car seemed to be running normally during testing; I would likely suggest decarbonizing the engine, in an attempt to clean the combustion chamber and bring the compression ratio back to spec.
Testing the converter making sure it was running at least 70% efficient and then question the test facility on their preconditioning practices.
We could go on here for quite some time, on all the other possibilities for your car to fail the test but this post is long enough as it is. LOL
Has anyone explained the repair cost limit to you and your option (if it applies to your needs) of a conditional pass, if repairs were to exceed $450.00?
Dan.
Canadian "EH"
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way2old
Veteran
/ Moderator
Aug 22, 2008, 4:51 AM
Post #4 of 4
(2772 views)
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Re: Anyone here good with emissions stuff?
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Told ya Dan would know.
Being way2old is why I need help from younger minds
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