The 89 6E codes APYP and ARAP have a problem with not starting right away. Sometimes, it takes 2 to 4 seconds of cranking before the engine will fire. The problem seems to be some missing values in a Crank Fuel PW Multiplier vs Ref Pulse table. The original table from GM is below:
Notice that the first 8 values are 0.
;--------------------------------------------
;Crank Fuel PW Multiplier vs Ref Pulse
;
;Val = Multiplier / 0.00390625
;
;Mult Ref Pulse
;--------------------------------------------
LC38B: .db 0x00 ; 0 1
.db 0x00 ; 0 2
.db 0x00 ; 0 3
.db 0x00 ; 0 4
.db 0x00 ; 0 5
.db 0x00 ; 0 6
.db 0x00 ; 0 7
.db 0x00 ; 0 8
.db 0x80 ; .5 9
.db 0x80 ; .5 10
.db 0x40 ; .25 11
.db 0x40 ; .25 12
.db 0x40 ; .25 13
.db 0x40 ; .25 14
.db 0x40 ; .25 15
.db 0x40 ; .25 16
LC39B: .db 0x33 ; .20 17
.db 0x33 ; .20 18
.db 0x33 ; .20 19
.db 0x33 ; .20 20
.db 0x33 ; .20 21
.db 0x33 ; .20 22
.db 0x33 ; .20 23
.db 0x33 ; .20 24
;*************************************** **************
I added hex value $40 in each of the first 8 positions in the table, as show below:
;--------------------------------------------
;Crank Fuel PW Multiplier vs Ref Pulse
;
;Val = Multiplier / 0.00390625
;
;Mult Ref Pulse
;--------------------------------------------
LC38B: .db $40 ; .25 1
.db $40 ; .25 2
.db $40 ; .25 3
.db $40 ; .25 4
.db $40 ; .25 5
.db $40 ; .25 6
.db $40 ; .25 7
.db $40 ; .25 8
.db $80 ; .5 9
.db $80 ; .5 10
.db $40 ; .25 11
.db $40 ; .25 12
.db $40 ; .25 13
.db $40 ; .25 14
.db $40 ; .25 15
.db $40 ; .25 16
LC39B: .db $33 ; .20 17
.db $33 ; .20 18
.db $33 ; .20 19
.db $33 ; .20 20
.db $33 ; .20 21
.db $33 ; .20 22
.db $33 ; .20 23
.db $33 ; .20 24
;*************************************** **************
This table change has allowed the engine to fire almost immediately every time.
A little note, at first I tried a $80 value, but it caused the engine to start and then almost stall from too much fuel.
Also, the 32B code, like the ABTZ from my 88, has all the values in this table set to max.

:steering:

 

Red, my $32b code only has 17 fields (0-128 in steps of 8) in the CFM vs. Ref. Pulse all set to 1.00 as you stated. I no longer have a 9th injector and dead cold startsup take upwards of 5-6 seconds of cranking. Once the car is warm it fires up on the first crank typically.

I've also go the "Crank Fuel Puse Width vs. Coolant Temp" which I have added I think 25% of the original values to the entire table without seeing much help.

 

Beat you to it :D
http://forums.corvetteforum.com/zerothread?id=592525 :cheers: :cheers:

 

I wonder if they do that to get the oil semi-circulated before the engine fires???
:chevy

 

My 87 starts up quicker with 89 code and cold start disconnected. A lot of manufacturers build in a startup delay now.