EGR disabled and Knocking

[David Cooley]

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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