Drinking too much
beer in Munich ;)
Join Date: Feb 2012
Location: I would rather not say
There's no actual measurement or feedback of the EGR valve opening %. The EGRvalve is simply solenoid operated which is driven with a PWM signal at 140.85Hz (I only know because I happened to measure mine yesterday )
The EGR % value is the requested EGR position sent from the ECU, the solenoid tries to deliver it but there is no sensing built in to the EGR that tells it if it achieved the desired value or not.
The 4% value is probably arbitrary and not relevant if you've had an EGR delete. Fitting a plate would stop any leakage just to be sure.
Last edited by FixitSan; 17-11-12 at 19:39.