Originally posted by Redlinerz
I have heard before that you dont even need to have a EGR. I dn't know how true it is but that is what a local mechancic has told me. Do you think it is sae tp run it with no egr ???
Certain manufactures do not use an EGR system (they engineered an engine that will pass emissions without one) but that does not mean you can bypass the EGR valve on any car.
The obvious reason is you will fail the NOx test but the not so obvious reason is the engine could 'ping' under load. Since the EGR lowers combustion chamber temperatures, an engine with carbon build-up in the combustion chamber or the timing out of spec might not ping with the EGR system working properly but it almost certainly will ping if it is disconnected. If you could run 87 octane with the EGR working properly you may need to run a higher octane without it.