[Gmecm] Help with unusual BLM's

[David Allen]

These come to mind off-hand. There are probably others... Is it a
metered-air system or a speed-density system?

-high fuel pressure
-fuel-logged evaporative cannister
-leaking fuel press. diaphragm
-TPS giving intermittent false delta TPS even though throttle is not really
moving.
-leaking injectors

If it's a speed-density setup the following also could affect it:
-loss of VE due to engine wear, exhaust clogged, etc.
-MAP sensor hose damaged giving false high MAP reading but not so high the
code sets.

David



----- Original Message ----- 
From: <ahuxtable at sola.com.au>
To: <gmecm at diy-efi.org>
Sent: Sunday, March 26, 2006 5:04 PM
Subject: [Gmecm] Help with unusual BLM's


> Hi all.  I've been trying to work out why for some reason my car has
> been running rich.  I just always assumed that it was the O2 sensor
> playing up - Until yesterday that is...
>
> I logged some data and the highest BLM I saw was 120.  Most being around
> 115 so my engine is running fairly rich. So, the computer thinks that
> it's running rich and it actually is = not O2 sensor.  Next I thought it
> might be the CTS or MAT sensors but logging them, it's all normal.  CTS
> reports running temp of ~85DegC (184DegF) and MAT is reading as expected
> too.
>
> What else could be forcing the engine to run rich?
>
> Thanks
> Andrew
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