[Gmecm] Modify $8D to work on MPFI 3.1L DIS engine - It RUNS

[Ryan Hess]

Your memcal has a netres chip that is the "backup" should the prom fail.  In otherwords, the prom and netres need to match (V6 or V8 or whatever) or that code is set.

Brendan Patten <bpatten at centurytel.net> wrote: Okay, I've had the car running fine and timing seems to be right on
track.  I do have one thing happening.  It is setting a code 41 after
about 10 seconds of running.  This is cylinder select error.  I do have
the number of cylinders set to 192.  Other then that I don't know where
else to look

Anyone else encounter code 41 ?

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On
Behalf Of davesnothereman at netscape.net
Sent: Monday, September 04, 2006 7:36 AM
To: gmecm at diy-efi.org
Subject: Re: [Gmecm] Modify $8D to work on MPFI 3.1L DIS engine - It
RUNS

  
Changing calibration values does not generally cause communication
failures.  Changing spark reference angles may cause engine failure, but
does not cause ECM comms failure.
 
Timing values for max and min work like number line.  Look at absolute
value for conversion to degrees.  For negative ($FFXX) values, use
difference between $10000 and value in question.  Sign for "advance" or
"retard" depends on spark reference angle and sign of spark typically
encountered after reference angle is subtracted from desired angle.  
 
 $10000
-$ FFE3
=$   1D
 
$1D = d29
d29 * .35163 = 10.195
 
Generally speaking, for DIS calibration, typical spark angle has
negative sign.  More negative values indicate more advance.  For
distributor calibration typical spark angle has positive sign.  More
positive spark values indicate more advance.  The $88 data posted
indicates 60 deg maximum advance and negative 10 deg minimum advance.
 
Zaphod
 
-----Original Message-----
From: bpatten at centurytel.net
To: gmecm at diy-efi.org
Sent: Mon, 4 Sep 2006 1:38 AM
Subject: RE: [Gmecm] Modify $8D to work on MPFI 3.1L DIS engine - It
RUNS


Here is what I have found.

1990 CAVALIER Z24 ATMF5241 $88
            location        hex     value 
Initial SA:     13          1A      9.14
Spark Ref Angle 15          AA      59.77
        Equation:  0.351563 * X + 0 used for two above

Max Adv     1D          FF E4       -19.69
Max Retard      1F          FF 39       -139.92
        Equation:  0.703125 * X + -46080.000000 used for two
above

All this data looks correct for a DIS v6 engine.  I looked at my
Tunerpro XDF definitions and the A1, 8F, 88 all have the exact same
values for those 4 constants.

Now here is the 88 mask 3.1L Camaro distributor

AZTY1407 FBODY 3.1L $88
Initial SA:     13          1A      9.14
Spark Ref Angle 15          1C      9.84
        Equation:  0.351563 * X + 0  same equation as above DIS
motor, same values seems logical.

Max Adv     1D          00 AB       -45956.77
Max Retard      1F          FF E3       -20.39
        Equation:  0.703125 * X + -46080.000000 same as used
above.

Now what happened to the Max Advance????  If you use the 0.351563
equation, you get a number that makes more sense.  60.12 Degrees.

So what is going on here???
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