Ok then your EGR is disabled, don’t worry about the 15%duty cycle your seeing as it’s physically impossible for it to activate if it’s not connect to the harness.
also you may look at zeroing the EGR spark table adder if there is one, in-case that 15% dc is fooling the pcm thinking that the EGR is still activating (even tho it physically can’t) and adding or retarding spark
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