MEMCAL swap '88 to '89 (identical cars)

[nacelp]

Lacking any other responses, that has been covered, and is in the archives,
here or at DIY.
Grumpy


> My girlfriend and I both drive Oldsmobile Cutlass Supreme
> Internationals.
> Hers an '88, and mine is an '89.  Both have 2.8L V6's, both have 1227727
> ECMs.
> Where they differ, is her car used to be mass air.  It has a cylindrical
> airbox and a MAF.  However, a sticker on the core support states that
> the car was upgraded to Speed Density and to consult the 1987-88 Speed
> Density supplement for more info.  Her car also has California
> Emissions.  Her ECM is VERY touchy.  If power is temporarily removed
> from the ECM, the car will refuse to start for 50-100 cranks.  Once it
> starts, it wants to die, and it is difficult to even get the car to stay
> running in Drive long enough to complete the standard idle relearn
> procedure.  The idle relearn procedure also must be followed TO THE
> LETTER or else it will stall and die at every stop.  Once the idle
> relearn procedure is properly done, the car is usually fine but still
> dies occasionally the first half hour or so.  After awhile of driving,
> the car is fine from thereafter.  However, I flushed the cooling system
> today and there was some accidental splashing of coolant.  After I shut
> the car off, I let it sit for an hour or so.  Splashed coolant seems to
> have totally messed up the car's electrical system, as it no longer
> wants to run.  It acts as though the battery was disconnected.  I
> suppose resetting the ECM and doing the idle relearn MIGHT fix it, but
> this is pretty much the last straw.  I remember one time, all I did was
> clean the carbon out of the throttle body.  The car ran terrible and
> never recovered on its own.  I had to reset the ECM and go through idle
> relearn again.  The car has given us so much grief and frustration.
>
> On the other hand, my '89 has a square plastic airbox, no MAF, just an
> IAT in the airbox.  Other than that, everything is virtually identical.
> However, my car seems to have a much better set of base parameters.  If
> power is temporarily disconnected, the car will still start right up
> first try and seem to run perfectly from the start.  Even if idle
> relearn procedure is ignored, it will still seem to run just fine.  I
> have also once cleaned out the TB on this car too, and not once did it
> stall.  It was a little trembly at idle, but after awhile, it fixed
> itself.  This car has Federal Emissions.
>
> I have a spare MEMCAL from my '89.  I have been hypothesizing that her
> car may run better with an '89 MEMCAL.  I plan to go to the library
> tomorrow to compare the two ECM schematics to see if there are any
> differences in wiring that may pose a problem.  I think VSS, MAP, O2,
> IAC, EGR, and other various sensors/controls are the same.  Only problem
> will be that her MAF functions as an IAT, while the '89 has a real
> standalone IAT.  Will this pose a problem?
> My goal is to make her car's ECM as "robust" and easy to live with as my
> '89.
> Any thoughts?
>
> --
> Shawn Lin
> http://www2.cybercities.com/g/gmwbodycars/
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