code 44 - why?

[Gabe]

The 350 calibration assumes a larger injector - so for every unit of air
that passes thru the MAF, the pulse width with be shorter in duration
(than the 305 cal) to deliver the same amount of fuel per unit of air,
hence leaning the engine out.

Gabe

"den Broeder, Ernst" wrote:
> 
> I had an interesting experience with my TPI setup in the past 2 days since
> I got it running.  It's a 1989 MAF '165 system on a 5.0L with TPI.
> 
> I have been using AUJM (350, auto, 3.27, FED) and it keeps setting code 44
> on me.  I switched over to a APYS (305,M5,3.45) and the problem goes away...
> 
> Could someone please explain why I see this behavior?  I checked through
> the archives and found a few tidbits that lead me to believe it's just a
> case of the definition of what is lean and what is rich...?   What I don't
> understand is why it would be different for different engine
> displacements.  Could it be because the O2 sensor is sensitive to the extra
> back pressure a 350 (as opposed to a 305) would apply against a set of
> factory exhaust manifolds?
> 
> Ernst
> 
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