homer

Mine did the exact same thing... it was actually pedal to the floor, open intake, less vacuum, IWE system would start to engage. Mine wasn't RPM related (to a degree), it was throttle body positioning (how much vacuum available). Anyways, I vacuumed tested each hub individually, passenger was shot. What was more interesting though ... The passenger leaked, but the drivers side was the one grinding due to the low vacuum. This was because my passenger side had failed so bad that it was always engaged. The drivers would start to engage.


So if you vacuum test it, test both, not necessarily the side that's making the noise.


Just my thoughts.