EST Distributor

[Bob Wooten]

Cool

-----Original Message-----
From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf
Of Len Sabatine
Sent: Thursday, March 29, 2001 10:14 PM
To: gmecm at diy-efi.org
Subject: RE: EST Distributor


  Yep. Does things like IP ,creature comfort controls , etc. The "Other"
module is the CCM. I haven't seen  anything  between the Dissy and ECM as
far as a "Box". The CCM  to ECM config is one reason Vette Chips don't work
in F  Cars , among other tid bits... Later Y versions get complicated ,
especially with
   V.A.T.S. and Pass Key II Systems. Again the CCM is not used in F Cars ,
only  Vettes.

>Len,
>are you saying that the CCM is the "module" that the dealer was talking
>about. & that it is another box between  the ECM?
>
>BW
>
>-----Original Message-----
>From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf
>Of Len Sabatine
>Sent: Thursday, March 29, 2001 9:03 PM
>To: gmecm at diy-efi.org
>Subject: RE: EST Distributor
>
>
>     Oops , * 8 th vin character IDs Engine . - 8 = 350 TPI.
>     90 thru 92 F / Y Body = MAP sys, NOT MAF. 7730 ECM / F car , lives
>     in pass compartment. 7727 [ sealed case] Y car , lives in engine
>compartment.
>     Both ECMs function same , use different  style harness to Ecm
>connectors.
>     You may have an early TPI Dissy. It is fastened with 4 hold Down
>[Screws].
>     A  common HEI cap won't work on TPI Hei Dissy.
>     F cars don't use a CCM , they are used on Y cars.
>     MisInformation is a bummer.
>     Len
>
> >I see.  I think that you are right, it is time that I get another source
of
> >information.  what I was using was the print in the manual & an educated
> >guess @ how it works.  the description that Keith quoted makes perfect
>sense
> >to me now.
> >
> >the reference to the 8 engine code is to the VIN.  there were two TPI
>engine
> >codes in 91, one was 8 & the other F.  I think that the difference was
one
> >was MAF & one MAP.  the distributor diagrams in the manual that I have
are
> >different for them as well.  It appears that the 8 Engine code is the
"HEI"
> >style of distributor with the Coil in cap & the F is the tall thin
> >distributor that I have that has an external coil.  but as I said, I
don't
> >have that one so I don't know what it really is.
> >
> >a fried of mine has an Iroc that is a MAF car.  His computer died & the
GM
> >dealer told him that there are two ECM's for his car.  one has the coil
> >driver in the ECM & the other has another "module" that goes between the
>ECM
> >& the distributor.  this has always perplexed me as I don't recall having
> >ever seen a GM "Module" that was not either in the distributor or in the
> >ECM.  any thoughts or is this just another "parts guy" that doesn't know
>his
> >ECM from a hole in the ground?
> >
> >Tanx, again to all.
> >BW
> >
> >-----Original Message-----
> >From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf
> >Of Shannen Durphey
> >Sent: Thursday, March 29, 2001 6:06 PM
> >To: gmecm at diy-efi.org
> >Subject: Re: EST Distributor
> >
> >
> >Isn't this abbreviation in the FAQ?  It should be.
> >
> >EST stands for Electronic Spark Timing.  This is a control mode.  The ECM
>is
> >in
> >control of spark timing (and dwell in distributor applications), with
input
> >from
> >and output to the distributor.  The ecm also uses inputs from the other
> >engine
> >sensors to determine spark timing.  This is one of two basic spark modes,
> >the other
> >being Bypass mode.
> >
> >I don't know what you mean by "the 8 eng coded 91".  The only distributor
> >which I
> >can think of with something close to EST, in addition to mechanical and
> >vacuum
> >advance units, is the 81 vintage 305 used in Chevy/GMC pickups.  This was
>an
> >ESC
> >system, which would retard spark when knock was detected.  I do not know
of
> >any CCC
> >or later generation ecm/pcm controlled engine management systems which
used
> >mechanical and vacuum advance in addition to ecm controlled timing.
> >
> >You would be a wise man indeed to trade your Chilton's reference manual
for
> >a real,
> >true GM service manual.  You should also consider finding the address for
> >the
> >company that supplies GM with its training materials, MSX.  The manual
> >titled "fuel
> >injection" will supply some very good reading material. Much of what you
>are
> >saying
> >is backward or misinterpreted, which could easily be attributed to a good
> >mind
> >learning from a poor source of information.
> >
> >Shannen
> >
> >Bob Wooten wrote:
> > >
> > > Questions #2, I think also another simple question.
> > >
> > > what is meant by EST?  I have a 91 Camaro that has an EST distributor
>(so
> > > says Mr. Chilton).  what I have noticed, & I am guessing but want to
>clear
> > > it up is that EST is more a scheme than anything.  this means that the
> > > Distributor controls the spark duties w/the small input from the ECM
for
> > > retard & LHM.  this means that the distributor conditions the PU coil,
>has
> > > the driver in it for the HV coil & outputs a signal that is used to
> > > determine RPM.
> > >
> > > another guess is that all the EST setups do not have any Vac or Mech
> >advance
> > > to them, but?????  I noticed that the 8 eng coded 91 has the
"standard"
> >HEI
> > > setup & I think (I don't have it so....) that it does have both Mech &
>Vac
> > > advance on it still.
> > >
> > > thanks for clearing that up.  here comes #3.
> > >
> > > Bob Wooten
> > > r71chevy at earthlink.net
> > > www.r71camaro.homestead.com
> > >
> >
>
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