[Gmecm] Help with unusual BLM's

[Steve Ravet]

> -----Original Message-----
> From: gmecm-bounces at diy-efi.org 
> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of ahuxtable at sola.com.au
> Sent: Sunday, March 26, 2006 7:36 PM
> To: gmecm at diy-efi.org
> Subject: RE: [Gmecm] Help with unusual BLM's
> 
> It's a map based system 1227808 - Aussie Holden Astra 1.8.
> 
> MAP and TPS readings seem to match up ok.  Doesn't seem too 
> out of the ordinary.
> 
> Exhaust has good flow.
> 
> If it was high fuel pressure or something like that, wouldn't 
> it try to lean the engine based on low BLM's?  It's as if the 
> computer is deliberately trying to make it run rich.
> 

Assuming the O2 sensor and the feedback  circuitry is all working
correctly, and the computer is in closed loop, then the engine is
running at stoich.  What the BLM is telling you is that the computer is
having to subtract fuel from what the VE table otherwise specifies.

This means the engine is getting less air than the VE table says that it
should be getting (ie plugged exhaust), or it's getting more fuel than
what the computer is trying to give it (ie flooded EVAP system, leaky
injector, too much fuel pressure, etc.)

--steve


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