Using the hex editor to remove spark advance when in ALDL mode?
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From: Buffalo, NY
Car: 1988 IROC-Z
Engine: 427 SBC
Transmission: ProBuilt 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac
Using the hex editor to remove spark advance when in ALDL mode?
I'm using $32B. There is no place to edit this like in $6E. I found an old thread where RBob says:
I'm still confused. Is this hex address 23? Thanks for the help. This is listed in the $32B extended XDF. But I'd like to see how to edit it using the hex editor.
I'm still confused. Is this hex address 23? Thanks for the help. This is listed in the $32B extended XDF. But I'd like to see how to edit it using the hex editor.
Last edited by IROCThe5.7L; Aug 5, 2013 at 07:01 PM.
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Car: 1973 Datsun 240Z/ 1985 S-15 Jimmy
Engine: Turbo LX9/To be decided
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Axle/Gears: R200 3.90/7.5" 3.73
Re: Using the hex editor to remove spark advance when in ALDL mode?
The line you have highlighted is 230, not 23.
23 would be on the 3rd line in the hex editor. The line starts at 20, then count over 3 more places to 23, you will see the value of $17.
23 would be on the 3rd line in the hex editor. The line starts at 20, then count over 3 more places to 23, you will see the value of $17.
Thread Starter
Moderator
Joined: Jul 2001
Posts: 5,225
Likes: 70
From: Buffalo, NY
Car: 1988 IROC-Z
Engine: 427 SBC
Transmission: ProBuilt 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac
Re: Using the hex editor to remove spark advance when in ALDL mode?
Ahh! Thank you very much. 
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From: Chasing Electrons
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Transmission: check
Re: Using the hex editor to remove spark advance when in ALDL mode?
GM did things like this to aid in troubleshooting. Adding SA causes detonation, which can be used to test the ESC system. IIRC, the 10K resistor also bumps up the idle speed.
Other ALDL modes will/can force closed loop operation even if the engine isn't up to temperature or the O2 sensor isn't active yet.
RBob.
Other ALDL modes will/can force closed loop operation even if the engine isn't up to temperature or the O2 sensor isn't active yet.
RBob.
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