EGR disabled and Knocking

[Bruce Plecan]

the base calibration for his application needs work.
If you render the EGR inop, and then it pings then that just means you have
too much timing, and/or AFR is off.  The EGR was just masking it is all.
You just can't expect to flip a switch and always have things line up,
afterward.
In even a 747 you got 250 areas to play with, so playing dominoes is always
possible
Bruce
   Luckily hadn't rained, so following the trailer ruts was easy.  Boat has
been recovered, but *War Paint* was found, and no sign of the little guys
yet.  Several empty bottles of the good stuff were also found at the site,
gads, the mind she boggles

----- Original Message -----
From: "Kevin R" <KEReyn at gte.net>
To: <gmecm at diy-efi.org>
Sent: Thursday, October 12, 2000 10:38 PM
Subject: Re: EGR disabled and Knocking


> OK, I'm with Brent on this question. I understand that by not inducing
inert
> gas into the intake track and then increasing timing and leaning fuel
would
> cause knock, but the idea of  0ing out 1b3 is to disable the EGR function
so
> that not only does the EGR not function, the mixture shouldn't be leaned
and
> the spark not advanced so what's the deal?
>
> Kevin R
>
>
> > At 08:48 PM 10/12/2000 -0400, you wrote:
> > >I disabled EGR (1b3 set to 00) on my stock '91 C2500 350/A4, 7747.
When
> I
> > >took it for a test drive it knocked alittle during cruise and light
> throttle
> > >accel.   Should disabling EGR cause it to knock?  I thought it would
run
> the
> > >same as with EGR on, seeing how EGR adds spark and removes fuel.
> >
> >
> > It should ping at cruise and light throttle... advances the timing and
> > leans the fuel... 2 ingredients for knock... with EGR, it keeps it from
> > pinging under those conditions.
>
>
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>
>

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org