"Hachiroku ????" <Trueno@[EMAIL PROTECTED]
> wrote in message
news:uRnUj.15$Gf.4@[EMAIL PROTECTED]
> First, a bit of background. I might do better if I fix the transmission
> and the speedo cable. The speedo cable is broken at the tranny, and
needs
> a new piece to make things right. Only $80 for a 6" piece of cable. This
> will get the speed sensor in the speedometer feeding to the ECU again
(the
> sensor is working, but because the speedo isn't it registers 0 MPH to
the
> ECU.)
>
> Add to that two broken solenoids in the tranny. Easy to replace, $80
> each...
>
> Now, I appear to be getting about 12 MPG with the car...I dunno, because
I
> can't calculate it, because...the speedo doesn't work...
>
> The recent inspection showed HC, CO at perfect levels for a car this
old,
> almost as good as new. The NOx was almost over. I think it passed by 6
> points. Indicative of a plugged Cat? There aren't any other driveability
> problems, the car rips along pretty well.
>
> Now, I can't remember...to reduce NOx, do you Advance the timing, or
> Retard it? Last summer I set the timing dead nuts on spec, and then
played
> with it slightly to get the car running smooth and get a little OOMPH
out
> of it, only a degree or so one way or the other.
>
> Now, about the roof. I havent been driving with the roof on much, so I
> suppose this isn't helping, either. But it just seems I wasn't putting
> this much gas in it the past 3 years...
>
High NOx comes from high combustion chamber temperatures, which can be the
result of insufficient EGR flow, over-advanced timing, or lean mixture.
--
Ray O
(correct punctuation to reply)
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