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Aurora40 · 04-24-2009

I suspect he is referring to a malfunctioning EGR valve. In which case the operating parameters for it are not that relevant. If the valve won't close properly, you can have driveability issues. I don't know that detonation is one of those issues, though.

I don't know how prone the LT5 system is to that, nor how easy it is to check or clean the valve, etc, since my car does not have EGR.

Do you get detonation at light throttle?

FYI, as Jeff mentioned, the AIR pump warms the cats up faster. EGR I believe is to prevent excessive NOx emissions by cooling down the combustion chamber

04-24-2009	#5
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,704	Re: EGR system I suspect he is referring to a malfunctioning EGR valve. In which case the operating parameters for it are not that relevant. If the valve won't close properly, you can have driveability issues. I don't know that detonation is one of those issues, though. I don't know how prone the LT5 system is to that, nor how easy it is to check or clean the valve, etc, since my car does not have EGR. Do you get detonation at light throttle? FYI, as Jeff mentioned, the AIR pump warms the cats up faster. EGR I believe is to prevent excessive NOx emissions by cooling down the combustion chamber Last edited by Aurora40; 04-24-2009 at 01:42 PM.