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Discussion Starter · #1 ·
I purchased my bull in May of 2003 from a friend. At the time it had ~92000 miles and passed smog well within maximum allowable limits (2500 RPM - HC Max 130ppm, Meas 45; CO% Max 1%, Meas 0.03% IDLE RPM HC Max 100ppm, Meas 29; CO% Max 1%, Meas 0.02%). The car was well taken care of at the original dealer for all service. I have performed all recommended services since owning the car, and am currently registering ~118000 miles.

I was directed to a test-only station due to having since relocated to the central valley (piss poor air quality). I recently failed a smog inspection due to elevated hydrocarbons (15 mph - HC Max 52ppm, Meas 77; CO% Max 0.49%, Meas 0.46% 25 mph - HC Max 36ppm, Meas 32; CO% Max 0.46%, Meas 0.20%).

Any ideas where to start? Given the high HC, I'm thinking O2 sensors or cat, as the plugs have less than 17000 miles on them. But I need to will wait for BAR CAP authorization for diagnosis and repair reimbursement eligibility due to test-only status.

98SEBull
Duratec DOHC
 

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Originally posted by 98SEBull@Sep 9 2004, 11:53 PM
I purchased my bull in May of 2003 from a friend. At the time it had ~92000 miles and passed smog well within maximum allowable limits (2500 RPM - HC Max 130ppm, Meas 45; CO% Max 1%, Meas 0.03% IDLE RPM HC Max 100ppm, Meas 29; CO% Max 1%, Meas 0.02%). The car was well taken care of at the original dealer for all service. I have performed all recommended services since owning the car, and am currently registering ~118000 miles.

I was directed to a test-only station due to having since relocated to the central valley (piss poor air quality). I recently failed a smog inspection due to elevated hydrocarbons (15 mph - HC Max 52ppm, Meas 77; CO% Max 0.49%, Meas 0.46% 25 mph - HC Max 36ppm, Meas 32; CO% Max 0.46%, Meas 0.20%).

Any ideas where to start? Given the high HC, I'm thinking O2 sensors or cat, as the plugs have less than 17000 miles on them. But I need to will wait for BAR CAP authorization for diagnosis and repair reimbursement eligibility due to test-only status.

98SEBull
Duratec DOHC
No CO2 readings? That is a big clue as to what's going on in the engine. But i'd say a "lazy" or slow responding O2 sensor could cause that. I do alot of emissions testing at work on the engines after installation so I could help you out.
 

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Discussion Starter · #3 ·
Sorry -

5/03 CO2%: 2500 RPM 13.7, Idle 13.6

9/04 CO2%: 15 mph 14.3, 25 mph 14.5
NO ppm @ 15 mph = 7, 25 mph = 14
 

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Originally posted by 98SEBull@Sep 10 2004, 12:10 AM
Sorry -

5/03 CO2%: 2500 RPM 13.7, Idle 13.6

9/04 CO2%: 15 mph 14.3, 25 mph 14.5
NO ppm @ 15 mph = 7, 25 mph = 14
Hmm... Its harder to diagnose without having a 5 gas analyzer in front of you to work with... :lol: But what it "seems" like is its prolly running rich at idle from a lazy O2 sensor. While at higher rpms the cat will heat up and burn away the excess hydrocarbons. Oxides of nitrogen are pretty low at idle which suggest rich (which you can tell anyways by the high HC reading). Carbon monoxide (CO) isn't suggesting a misfire but IMO that fuel deliver could be controlled better. (again O2 sensors) At higher rpms (25 mph) Nox rises but still stays pretty low which is still pointing to running too rich. I suggest a change of the front two O2 sensors and a re-test. If you were in my area i'd be glad to run some emissions testing and help you out. BUT... i'm a looooooong.... looooooong ways away here in Chicago.
 
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98SEBULL, I work at pepboys... If you would like, I can help get your car passing smog as best I can. I'm down to take a trip out to Merced... In return, come over and help with the SHO-ABLE project! LOL Let me know if you need a hand.


Sal
 

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Discussion Starter · #6 ·
Thanks for the help Xmann01. :notworthy:

I replaced the two upstream O2 sensors and cleaned out some carbon deposits behind the TB. She didn't pass with flying colors, but she passed. Now we're good for another two years. :banana:
 
G

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Good Work Chris.

Hey, you down to help out with the SHO-ABLE Project? I could surely use a helping had with the bumper and other stuff.

If not, then lets meet up soon.

Sal
 

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Originally posted by 98SEBull@Sep 13 2004, 09:53 PM
Thanks for the help Xmann01. :notworthy:

I replaced the two upstream O2 sensors and cleaned out some carbon deposits behind the TB. She didn't pass with flying colors, but she passed. Now we're good for another two years. :banana:
No problem dude. What were the final numbers?
 
G

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Originally posted by 98SEBull@Sep 13 2004, 09:53 PM
She didn't pass with flying colors, but she passed.
Good job!!!

When I get my cars smogged since I know the people they mark it up as a re-test and give it to me for $10 :lol2: :p
 
G

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Cool. I got a friend that does smog. I'm pretty sure he'd help me to get the Sable to pass smog. But I doubt it would pose a problem.


Sal
 

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Discussion Starter · #11 ·
Final numbers:

15mph %co2: 15.0, %o2: 0.0, HC: 30, co%: .35, NO: 1
25mph %co2: 15.1, %o2: 0.0, HC: 20, co%: .08, NO: 4
 
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