> -----Original Message-----
>On Behalf Of Eric Hufstedler
>
>>I just went through the same thing on my father's 95 3.9 with almost
>>the same exact readings. The O2 sensor was faulty causing it to run
>>lean (hot combustion chamber) which makes for high NOx. We also
>>cleaned out the EGR for good measure.
>
>
> Ok, thanks for the info.
>
> Why was the lean-ness causing high HCs? (i'm not arguing, just trying to
> learn..)
>
> thanks,
> eric
>
This brings up a question, I remember from previous posts that your O2
sensor can have a drastic effect on your gas mileage. I also vaguely
recall something being said about the service life of an O2 sensor being
roughly 60k miles.
History: My truck has 98k on it, and get's crappy mileage, but has no
codes. At 60k, I had new cap/rotor/plugs/wires done, and also had the TB
cleaned and the new intake gasket done.
My actual question is this: are O2 sensors like the other wear items in
your truck [change every xx miles] or "run 'em 'til they break" like an
alternator. I just spent $35 to fill up my truck last night, so I am
thinking about fuel efficiency [but not enough to go buy a geo..]
99,5.2,4x4,bone stock motor save for a K&N drop in and a mopar catback. I
don't have smog testing here, but might be moving to a place that does [STL]...
Thanks.
--
-Barry
"Life is a tragedy for those who feel and a comedy for those who think"
-fortune cookie
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