[Gmecm] $58 ALDL-reported BPW jumping (when it should be constant)

[Rob Handley]

Yay! Found the cause of the ALDL-reported BPW being mostly stuck at zero. (I 
had set all the F77 values to 0 instead of 1.) :-)

However, with the engine sitting at idle, using fixed values of (in the 
notation of the P4 Turbo doc): BPC, MAPP, MAT', VE, F33C, BLM, DFCO, CLT, 
and F77, the ALDL-reported BPW still occasionally jumps up to a higher 
value - e.g. 24 ms.

I can't find a value of A/F' to display (in my home-brew ALDL monitor 
program), but desired A/F is very slowly changing (due to warm up).

Nor can I find a value of DE to display, but I've done my best to turn this 
OFF.

I haven't yet put a 'scope on the injector line (next job...) to see if the 
hardware tells the same story as the ALDL, but if anybody's got any ideas as 
to the cause of the jumping ALDL-reported BPW, I'd be very interested to 
hear them!

Robin

----- Original Message ----- 
From: "Rob Handley" <Robin at FuryWorld.fsnet.co.uk>
To: <gmecm at diy-efi.org>
Sent: 24 August 2007 14:04
Subject: Re: [Gmecm] $58 F29/F29E VE lookup weirdness


> Test drive log with engine speed up to over 6800 RPM showed no VE blips 
> either. :-) Thanks for the pointer.
>
> BPW still zero for 98 % of the time, so shall start investigating that 
> now...
>
> Robin