J-bodies and DIS

[kkk at pace10.wh.lucent.com]

The Impala with LT1 engine also uses VAT. The 94 police cars
actually had a VAT disable module because they didn't
incorporate VAT in the key.

		Ken

lkurek at smtpgate.anl.gov wrote:
> 
>      Yup...DIS is pretty much a stand alone system. However, I think the
>      ECM handles cranking timing and knock retard control, both of which
>      are then translated within the DIS module. If you can adapt an HEI
>      module to work, I would think that would be sufficient.
> 
>      Also, there are no J-bodies, even the current ones, that use a
>      VATS/Pass-Key system. From what I know, the Vette and F-bodies have
>      it, along with maybe a truck (?).
> 
>      TTYL!
> 
>      Larry
> 
>      FWIW, I used to have an 89 Z24...no VATS!
> 
> ______________________________ Reply Separator _________________________________
> Subject: J-bodies and DIS
> Author:  <diy_efi at efi332.eng.ohio-state.edu> at internet
> Date:    4/15/98 7:01 PM
> 
> Hi,
> I am going to try and modify the system from a J-body v6 '87-'89 to work on my
> car, a non-GM 6 cyl.
> I've been looking thru manuals at the library and I have a few questions:
> 1:  I was surprised to find that ALL j-body V-6s use DIS.  From looking at the
> diagrams, it seems that the DIS systems work some what on their own, and that
> the only interaction with the ECM is the same as would be the case with a
> 7-pin HEI module.  In other words, I could do away with the DIS (which would
> require a crankshaft signal) and wire it up to a HEI module, and the computer
> will still function.  In other words (again) the Sync signal from the
> crankshaft goes to the DIS module, but doesn't go to the ECM.  The DIS module
> just sends a regular pulse to the ECM, exactly as a HEI module would.  Do you
> know if this is correct?  (my car already incorporates a 4-pin HEI module so
> putting in a 7-pin would be pretty much Plug-n-Play.)
> 
> 2:  I could find no reference to a VATS module in any of the wiring diagrams I
> saw, so maybe those models (87-89 j-body v6 w/ 7730 ECM) don't use it.  That
> would be a plus!  Of course this information may be wrong, Does anybody know
> otherwise?
> 
> Thanks for any info,
> Adam
>