ok, I left some information out....
on the first run, the truck actually DIED on the dyno (at 4k+ rpms) and would
not start. Initially we thought it was flooded.
One the guys grabbed a wire from the distributor and plugged in a spark
plug...no spark.
I had done an ignition upgrade about 3 months ago. (wires taylor thudervolt,
autolite 3923, brasss cap/rotor) and replaced the stock coil with an accel
super coil (the one that requires an adapter). I ran down the street and bought
an aftermarket replacement coil. crank....it started. the damn accel coil died
on me, on the freaking dyno!
The truck was running rich on the run it died and subsequent runs. now that you
mention air filters....my air filter (cone) did look really dirty...
what sensor is the CTS? and where can i get a scanner?
My intial suspicion was the injectors. ive been using regular costco gas, and
bad gas, for a long time.
In article <000001c79ac7$2aa27dd0$2f544b0c@Dakota>, bpracing@worldnet.att.net
("Ray Block") writes:
>
>
> > -----Original Message-----
> > From: msnbcnnbcbs@hotmail.com
> >
> > I was under the assumption that a/f ratio at WOT was 12.0-12.5?
> >
> > In this case it was 10.4, which is VERY rich. It seems to have dropped to
> > that
> > level after about 4k rpms(?)
>
> Hmmm, yeah, that's really rich! I would expect it to be blowing black
> smoke out the exhaust at that level.
>
> > The dyno operator did not take the engine to redline(4800) as he was
> > worried
> > the a/f mixture was too rich, so the dyno chart is incomplete.
>
> That's odd.
>
> > the only thing i cant think of is the injectors are not atomizing the fuel
> > at
> > higher rpms (they are stock btw)
>
> I wouldn't jump to conclusions just yet. You'll just end up throwing parts
> at it that may not help. While a scanner will tell you a lot (my choice)
> you can test your sensors (IAT and CTS) with a volt/ohm meter. The
> resistance for various temps is in the FSM.
>
> The first thing I would consider is the condition of your plugs, wires, and
> air filter. Any misfires or restricted air flow would show up as a rich
> condition, as would excess fuel pressure at WOT. Also, was the engine up
> to full operating temp?
>
> Ray
> http://www.dragtruk.com/ENTRIES/20KM1FD2KWBP.html
>
>
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