Failed Emissions Please Help
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Joined: Jan 2005
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From: Texas
Car: 1991 RS Camaro Convertible
Engine: 305
Transmission: 700R4
Failed Emissions Please Help
Hi Everyone,
I took the car in for inspection today and it failed on emissions,one front tire and emergency brake. It failed on the low speed emissions. The car is a 91 RS Convertible 305 TBI.
The emission readings were as follow:-
Standard Current
HC(PPM) 120 196
CO (%) 0.67 0.28
CO2(%) 14.3
O2(%) 0.8
NOx(ppm) 907 1472
DILUTION(%) >6 14.6
What I have noticed is a broken component in the engine bay,I think its the air diverter valve.Could this be the problem?
Have enclosed a picture.
Thanks,
Alex
I took the car in for inspection today and it failed on emissions,one front tire and emergency brake. It failed on the low speed emissions. The car is a 91 RS Convertible 305 TBI.
The emission readings were as follow:-
Standard Current
HC(PPM) 120 196
CO (%) 0.67 0.28
CO2(%) 14.3
O2(%) 0.8
NOx(ppm) 907 1472
DILUTION(%) >6 14.6
What I have noticed is a broken component in the engine bay,I think its the air diverter valve.Could this be the problem?
Have enclosed a picture.
Thanks,
Alex
Last edited by aldixie; Aug 13, 2006 at 11:05 PM.
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
It could be the reason.
They're available at parts stores. Would be worth it to fix it. And do a tune up while you're at it if you haven't already.
They're available at parts stores. Would be worth it to fix it. And do a tune up while you're at it if you haven't already.
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Joined: Jan 2005
Posts: 30
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From: defuniak springs, fl
Car: 89 rs
Engine: 355
Transmission: th350
Axle/Gears: 4.56 posi
judging from your nox reading, i would say the diverter valve would definetly be a large part of the problem. it supplies oxygen to the cat to aid in the reduction of nox. hydrocarbons seem high, too. whens the last time you tuned it? oil age can also have an effect on hc readings, as the oil in the pan soaks up fuel that inevitably gets past the rings.
Last edited by raceb8; Jan 17, 2005 at 07:57 PM.
Thread Starter
Member
iTrader: (2)
Joined: Jan 2005
Posts: 475
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From: Texas
Car: 1991 RS Camaro Convertible
Engine: 305
Transmission: 700R4
Originally posted by raceb8
judging from your nox reading, i would say the diverter valve would definetly be a large part of the problem. it supplies oxygen to the cat to aid in the reduction of nox. hydrocarbons seem high, too. whens the last time you tuned it? oil age can also have an effect on hc readings, as the oil in the pan soaks up fuel that inevitably gets past the rings.
judging from your nox reading, i would say the diverter valve would definetly be a large part of the problem. it supplies oxygen to the cat to aid in the reduction of nox. hydrocarbons seem high, too. whens the last time you tuned it? oil age can also have an effect on hc readings, as the oil in the pan soaks up fuel that inevitably gets past the rings.
Got the car thru the inspection. It was the air diverter valve. Tried my local autozone and it was $208 + Tax. Found someone in the classifieds who had one for $25 including shipping. Thanks Ben.
Getting a real kick out of driving the car especially with the top down.
Supreme Member
Joined: Feb 2004
Posts: 1,231
Likes: 1
From: Greenville, SC
Car: 1991 Chevy Camaro
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3.42
Found someone in the classifieds who had one for $25 including shipping. Thanks Ben.
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