Jeep 4.0 Liter MPI (circa 1987-1991)

[Programmer]

Hi, Jim--

If this thing used a make up of a cam sensor with no location for number
one--the ECU used a calculation of reading the cam sensor along with the
crank--this alloted a full two crankshaft locations before #1 cylinder is
found--the other problem on those earlier ones is the cam/crank sensor at
the back of the engine gets oil soaked and messes up--reading the thing with
a labscope makes diagnostics easier.

Lyndon
IP TECH
LWester at compuserve.com

-----Original Message-----
From: Simpson, James H <James.Simpson at Unisys.Com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Tuesday, May 04, 1999 5:13 PM
Subject: Jeep 4.0 Liter MPI (circa 1987-1991)


>Hi,
>
>I have a 1987 Jeep Cherokee 4.0 Liter MPI engine installed in a 1982 Jeep
>CJ7.  I have discovered that AMC used a Renault (Renix?) computer system in
>the 1987-1991 Cherokees, and that information on this computer system is,
so
>far, impossible to obtain.  I'm having some troubles starting the engine;
it
>cranks for several seconds (15-30) before it starts, if it starts at all.
>I've been through all of the static tests (sensor resistance/function, fuel
>pressure, etc.) and everything looks OK.  I've been looking for information
>on computer codes and commands with no success.
>
>Q. Does anyone have information on the Renix computer system?
>
>Q. Is it possible to retrofit a different computer system to this engine?
>Has anyone done this?  I guess GM would be my first choice.
>
>Thanks for any help you might be able to give!
>
>Jim Simpson
>
>