Originally Posted by Jos360
So your opinion is that the ECM would freak when it sees that the EGR is not connected anymore? Or do i misunderstand you?
It being illegal is not really my worry. It's more an issue that i have no idea how bad EGR is for a gas engine.
Yes, that is my opinion. I strongly believe the JK computer looks for evidence the EGR is actually working, but I don't know it for a fact. It seems I read it looks for a slight roughness or a change in how it runs, but I can't find that reference.
EGR bad for a gas engine? Maybe a slight reduction in performance, but not the clogged intakes like the old diesel fuel would clog a diesel intake.
Edit to add:
Found it: The EGR monitor calculates the difference in engine roughness from the EGR off condition to the EGR condition. This engine combustion stability difference as measured by engine roughness is the measure of a functional EGR system.
You may get this code:P0401-EGR SYSTEM PERFORMANCE