HELP WITH EGR !!! failed emission - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-29-2004, 06:50 PM   #1
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Default HELP WITH EGR !!! failed emission

40KMH CURB IDLE
CO% limit 037 / reading 0.77 FAILED limit 1 / reading 0.07 PASS
NOppm limit 501 / reading 543 FAILED N/A

the emission repair tech wasn't in.. but the owner is trainned in it.. and says it sounds more like the EGR or a loose vacuum to it.. then try troubleshooting after if thats not it..

My question is he said to press the bottom of it or something and the car should choke and stall?? or was that if it'* bad??

How would I know if the EGR is bad or not.. and how do I go about cleaning it up ?


I think a new one is going to be expensive.
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Old 03-29-2004, 07:08 PM   #2
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Do you have a service engine soon light?
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Old 03-29-2004, 07:14 PM   #3
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nope...

by the way.. I have a heat gun also.. just curious as to wat temp a cat should run to, so I can further see if the cat converter is clogged and messed or not..
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Old 03-29-2004, 08:09 PM   #4
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just priced out EGR on gmpartsdirect and it says OUR PRICE: $97.88



k... help people..
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Old 03-29-2004, 09:12 PM   #5
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Your EGR is alot different than mine. Pulling it and cleaning it should be straightforward, but you really need a realtime scan to verify operation. And as fuddy suggested, most EGR failures are indicated by an SES light. I don't know my chemistry that well (more of a physics guy), but I'd suspect your Cat may be a factor. Need someone with more emissions savvy to jump in here, Murdock.

It might even be a symptom of rust buildup on both of your O2'*. After submerging all that in the lake, this could very well be a problem. I really think a comprehensive realtime scan would be of great benefit. But it would have to be by a person who knows what he'* looking at. Understanding the relationships of the different sensors, and how they can have an effect on emissions.
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Old 03-29-2004, 10:16 PM   #6
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Quote:
Originally Posted by willwren
Your EGR is alot different than mine. Pulling it and cleaning it should be straightforward, but you really need a realtime scan to verify operation. And as fuddy suggested, most EGR failures are indicated by an SES light. I don't know my chemistry that well (more of a physics guy), but I'd suspect your Cat may be a factor. Need someone with more emissions savvy to jump in here, Murdock.

It might even be a symptom of rust buildup on both of your O2'*. After submerging all that in the lake, this could very well be a problem. I really think a comprehensive realtime scan would be of great benefit. But it would have to be by a person who knows what he'* looking at. Understanding the relationships of the different sensors, and how they can have an effect on emissions.
The three main reactions that occur in a cat are:

2NO => N2 + O2

2CO + O2 => 2CO2

(hydrocarbons) + O2 => CO2 + H2O

The first reaction is a reduction reaction, and is spurred by the catalyst and needs nothing else to work. The second and third reactions are oxidation reactions (burning, basically), and thus there needs to be extra oxygen in the exhaust for this reaction to occur.

Ideally, then, the oxygen sensors, etc, shouldn't have any effect on the nitrogen-based pollutants; they're up to the cat to fix. O2 sensors can certainly have a detrimental effect on carbon monoxide and hydrocarbons, though. Was your cat nice and hot when you took it in to get tested?

-b
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Old 03-30-2004, 12:04 AM   #7
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Keep in mind guys, his Supercharger IS NOT doing anything, the belt is off.
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Old 03-30-2004, 12:10 AM   #8
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Quote:
Originally Posted by Drifter420
nope...

by the way.. I have a heat gun also.. just curious as to wat temp a cat should run to, so I can further see if the cat converter is clogged and messed or not..
I've heard that one of the ways to check if that catalysts are working is to get the car up to operating temperature and compare the temperature of the cat input pipe to the cat output pipe. If the cat'* working, at least somewhat, the exothermic (heat-producing) reactions should cause the output of the cat to be hotter than the input (I think about 100* F or so is considered a ballpark number for "proper operation"). It'* probably safe to say that if the two temperatures are pretty close, or if the output is cooler than the input, that the catalysts are broken or poisoned.

--b
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Old 03-30-2004, 12:27 AM   #9
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Quote:
Originally Posted by BonneMeMN
Keep in mind guys, his Supercharger IS NOT doing anything, the belt is off.
Wait a minute here... No supercharger?

I'm having trouble interpreting the original post. If you've failed for CO, then your engine may not be getting enough air to it...

Not having the supercharger on could mess up everything, though.
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Old 03-30-2004, 01:01 AM   #10
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he needs to fix something on it, coupler or whatever, so he'* running around with the belt off.
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