4kcsq Failed Emissions
Ameer Antar
ameer at snet.net
Mon Mar 5 12:58:54 EST 2001
If the NOx test passed, the cat is prolly working. Sounds like it's either
a bad o2 sensor or wrong mixture setting. Just buy a new gas cap. good luck.
-ameer
At 12:42 PM 3/5/2001 , you wrote:
>My '87 4kq recently failed CT emissions. CO was 5.66. (pass is <1.08). HC
>barely passed at 161.1 (pass is <168.0). Can someone please lay out
>possible causes for this type of failure? I know it can't be diagnosed like
>this, but a list of possible culprits would be helpful. As far as I know,
>the O2 sensor and Cat are suspect, but beyond that, I don't know.
>
>TIA,
>
>Anthony.
>
>PS. The car also failed because they said the fuel cap had a bad seal (???)
>Any thoughts on that?
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