EGR disabled and Knocking
Len Sabatine
sabatine at epix.net
Fri Oct 13 05:00:58 GMT 2000
At 08:48 PM 10/12/00 -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.
>
>Regards
>BrentH.
>
>Disabling the EGR , removes the Addition of the Inert Exhaust Gas , which
subs as [ Artificial Octane Boost ] a mechanism to slow and smooth
Combustion.
Hearing detonation is worse case scenario , it can be happening
without being
audible to your ear . It is audible to the KS . At minimum , long term
exposure to
detonation will soften the piston decks and accelerate , top ring land
wear. If you
see shiny specks on plug insulators , that's your pistons melting away
on the Fly.
EGR tip in Added Spark Advance and leaning fuel works in concert to add
fuel mileage and reduce NOx emission levels. It's all part of a plan.
Len
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