[Diy_efi] LT1 spark disassembly question

mike katz ecmhacker at yahoo.com
Sun May 5 16:40:46 GMT 2002


On the 94-up EE prom, event side,
There appears to be an unused table and qualifiers for
spark manipulation. The quals start at L23DE, and the
indexed tables start at 23EB and end at
2405. The code for this appears to be using these
tables to manipulate L0220 (crank offset) and keeps
checking the knock sensor input L1496. The end result
is to use the regular spark tables or the low ocatane
multipliers. Can anybody verify this? What should I
label it?

I read the archives, and did not find anything on
this. Also, there seems to be some question about the
startup rpm vs SFI injection. Just for a note, the ecm
never leaves SFI operation, it pulses all of the
injectors for added fuel during startup. It is not a
batch fire mode. The cyl id is still used.

Thanks in advance

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