EGR disabled and Knocking

[Kevin R]

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.


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