[Gmecm] $58 F29/F29E VE lookup weirdness

[Rob Handley]

Ah. That explains it. Just tried a chip with the complete VE calculation 
bypassed and it did the same thing.

Is the ALDL BPW affected in a similar way?

It really would be very kind if you could let us know what bugs you've 
found. Fixes, if they exist would be nicer still, but just knowing the bugs 
would help focus efforts on tuning rather than bug finding. :-) I spent all 
day working through the array and table look up code trying to find this 
bug! :-(

BTW: If I've got it right, conversion of the code to a version of _F29_ that 
goes up to 6400 is just a case of NOPing out some lines and using a hex 
editor to set up the extended part of _F29_. If it ever stops raining, I 
hope to test this out...

Thanks,

Rob

----- Original Message ----- 
From: "Dig" <turbodig at yahoo.com>
To: <gmecm at diy-efi.org>
Sent: 23 August 2007 17:22
Subject: Re: [Gmecm] $58 F29/F29E VE lookup weirdness


Sort of a well-known bug... The ALDL stream is reporting erroneous data.

It doesn't seem to be real; there is no corresponding fuel hit that I've 
ever observed.

I haven't as yet found the cause, but I suspect it has to do with the timing 
of the routine involved in sending data and the fuel routine.
It's on our "to do" list for code59.

----- Original Message ----
From: Rob Handley <Robin at FuryWorld.fsnet.co.uk>
To: gmecm at diy-efi.org
Sent: Wednesday, August 22, 2007 2:35:22 PM
Subject: Re: [Gmecm] $58 F29/F29E VE lookup weirdness

Tried it with a code modification to provide a hard-wired 'MAP' value to use
in the F29 look up, and the look up routine still regularly returned zero!

Robin

----- Original Message ----- 
From: "Rob Handley" <Robin at FuryWorld.fsnet.co.uk>
To: <gmecm at diy-efi.org>
Sent: 22 August 2007 09:03
Subject: [Gmecm] $58 F29/F29E VE lookup weirdness


> I've been looking at VE for the last few days and, after putting test
> values in F29, F29E, and F30 I spotted the VE regularly (every ~6 secs)
> reverting to the F30 only value. Looking back at one of last year's logs
> this was happening then too. It also happens with the ignition on and the
> engine not running !
>
> Has anybody seen this or have any suggestions why the table look up (as
> used for F29 and F29E) should be returning zero every now and then? I find
> the table look up code hard to follow.
>
> Robin
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