J-bodies and MAP vs MAF

[Clare Snyder]

TBK wrote:
> 
> Mass systems had map too. Therefore on the Mass needs to be added. The EGR
> (digital or linear) may be different. HEI or DIS is slightly different.
> 
> -----Original Message-----
> From: ABTSZ <ABTSZ at aol.com>
> To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> Date: Thursday, April 16, 1998 6:05 PM
> Subject: J-bodies and MAP vs MAF
> 
> >  Hi,
> > I've been told different things by different people about whether J-body
> V6s
> >are MAF or MAP.  According to the schematics I've seen, some are MAF and
> some
> >are MAP based on different years and\or models.  The manuals I have only go
> up
> >to '90, however.
> > Does anyone know if any J-bodies are MAP based, and what years or models?
> I
> >don't know if I should trust the Chilton manuals I've been lookin at or
> not.
> > Also, If all I can find is a MAF based system with a 7730 ECM, is this
> >difficult to convert to MAP?  I realize I'd have to get a prom for a MAP
> based
> >care (F-body V6).  What about the wiring to the MAP?  Is there "vestual"
> >wiring in the harness?
> >
> >Adam
> >
There were so many problems with the MASS sensors that GM developed the
speed-density prom rather than replace the mass sensors. Many vehicles
with the mass installed don't use it at all. Eventually they stopped
installing it.
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