Quote:
Originally Posted by tpepmeie
BEDC and BEDD: This is part of the EST (spark timing) minor loop. Changing 0x4E to 0x00 is totally odd. It's a BCLR command (the bit to clear is EST enable), in the event that the stall saver logic is active. I would not recommend that change. In effect, whoever made that change is keeping EST spark control active while the engine is in stall saver mode.
BEDE: Same routine as above. The 0x0F is an instruction to set a program interrupt, which is supposed to happen at that point. I would not make that change.
BEDF: the 0x45 is an instruction (JSR=Jump to Subroutine) which is supposed to happen next. That subroutine sends a command to another chipset on the board. WTH were they trying to accomplish by changing that to 0x00? Not a good idea, IMO.
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Todd, thank you so much for that insight. I may put these back to stock and see how the car reacts. I have two anomalies I haven't had time to chase yet.
1) When cold it loves to stall when coming to a stop and sometimes is hard to restart. I've been attributing
(excusing it...) to being a modified LT5, but maybe there's more to this than meets the eye.
2) In a high gear situation (e.g., puttering along at 70MPH in 6th) subtle increases to the throttle to pass someone gradually or when going up a hill sometimes causes the car to feel like it "shuts off" for lack of better terms. Power is immediately gone as if someone snapped the throttle shut or killed the injectors. If I drop a gear and get it to a lower load it immediately goes back to normal. I've been meaning to datalog while in these conditions to see if it's a certain combination that triggers whatever it is.
Thanks again, I appreciate sharing your knowledge on the addresses.
-Brian