code 44 - why?

[den Broeder, Ernst]

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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