Mike's TPI question

[John Hess]

The '85 just has too much variance from the later models, including 
differing sensors and a different serial rate in the ALDL that is 
sufficiently slow to make it almost useless for diagnosis purposes. 
 The '85 CANNOT use the '89 chip OR computer, unless you modify the 
entire system to '86 or later.

No, the '86 thru '89 also use MAF.  The '89 just doesn't use the cold 
start injector, it is programmed into the PROM.  Note that there are 
other good things about the '89 Mapping, also, that are better than 
the '86.


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From:  Jeffrey R Muehl[SMTP:JRMUEHL at mail.delcoelect.com]
Sent:  Friday, January 10, 1997 2:30 PM
To:  John Hess
Cc:  diy_efi at coulomb.eng.ohio-state.edu; ws6transam at voyager.net
Subject:  RE: Mike's TPI question



   Why not an '85 TPI?  Because it uses a MAFS module?

  Can the '85 TPI use the '89 chip with the same modifications?
  If I remember correctly the '85 is a 32K PROM and '86-'89 were 128K
  PROMs.

  Any help in this area would be greatly appreciated.

  Thanks,
  Jeff


  >From:    JohnH @ ixc-comm.net
  >Date:    01/10/97 09:55:52 AM CST
  >Subject: RE: Mike's TPI question


  >

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