> -----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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