Re: need help with '165 in Vette

["NickG" <nikog@mediaone.net>]

I have an update on both of my problems, both of which are fixed now:

> What are the gms/sec at idle?

10 gms/sec

> What mode is Diacom in?

ALDL

> Is there a Nuetral, and in gear idle setting.

Bingo. That was what was going on. The ECM raises the commanded idle speed
by 50rpm when in Park or Neutral. Putting the tranny in gear resulted in the
programmed target idle sped.

> You at the limits so your so far off, I'd just be looking to get close,
> It's rich, and you have 48 for fuel pressure?.
> What intake?.

Accel TPI. Ported and extrude honed.

> What  for intial timing?.

6 deg at the dist, pretty much stock timing table (for now).

> Grumpy
> >
> > Problem #1:
> >
> > Above 80d Celcius, I have the idle speed set at 875rpm in the chip. Yet,
> > when at an engine temp of 88dC (indicated by the dash and Diacom),
Diacom
> > reports a commanded idle speed of 925rpm (which is the setting I have at
> > 44dC). Any ideas as to why the ECM is commanding a higher than specified
> > idle speed?

Fixed. See above.

> > Problem #2:
> >
> > Programming the chip to think it has 27lb/hr injectors results in a BLM
of
> > 108 and an integrator of 128 at idle. In an effort to raise the BLM
value, I
> > reprogrammed the chip with an injector constant of 28lb/hr. Results: BLM
108
> > and integrator of 110. Huh??? This doesn't make sense. Shouldn't the BLM
> > (and integrator) value increase with a shorter commanded pulse width?
What
> > am I missing here? (BTW, the min BLM allowed is 108, and both times BLM
cell
> > 0 was used.)

Check your fuel pump voltage guys!!!

The car in question has a large in tank pump (255lph I think). This resulted
in a fuel pump voltage of 11.9v. The ECM increases the pulse width when it
sees a lower than normal voltage. By running a secondary 10gauge power wire
(through a relay) to the fuel pump, the voltage increased to 13.1v, and the
BLM went to 124. Thus, the extra rich idle problem is solved.

Nick


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