EGR and BLMs, was Oxygen sensor....

[Bruce Plecan]

-----Original Message-----
From: Scot Sealander <Sealand at clarityconnect.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Sunday, November 01, 1998 2:50 PM
Subject: Re: EGR and BLMs, was Oxygen sensor....


>mrvette wrote:
> 
>> But from the below convertsation  the question I have is...what affect 
>> does the capability of doing the block learn tables over driving time 
>> have o this...seems that the BLC would correct for any built in errors
>> due to the changes....?  rite? rong?  
>
>Right, Gene.
>
>The block learn can easily add the necessary fuel.  It is within range, 
>but is only needed if you disable EGR by external means.  That is, if you
>use an EGR block-off plate, or otherwise defeat EGR mechanically, and the 
>ECM thinks that EGR is really on when it is defeated, it needs to add 
>fuel, and it will.

Not all the time, might add the fuel and set SES light.
Cheers
Bruce
>
>If you turn EGR off in the ECM, such as the PWM to the EGR is zero, then
>the ECM knows that there is no EGR, and it has the fueling right to start 
>with.
>
>The spark *in-this-case* is a little more complex.  One would have to see
>what the cal tables look like to really know, and not guess at what is 
>going on.  Tuning by long distance can be very difficult....  ;-)
>
>Scot Sealander     Sealand at clarityconnect.com
>