KCM
Active Member
hello everyone. I have a 2013 raptor scab and I noticed my gas mileage starting to go down. I also always have had this weird turning/metallic sound when I gas it(like right before it shifts up). I’ve done all maintenance done regularly on my engine/tranny and steering. 2wd and 4wd work fine and there isn’t any other noise than what I described and the loss of mpg. I had someone drive and I looked at the axles and other suspension parts. I noticed in 2wd my driver side cv axle is spinning forward and my passenger side is spinning backwards it looks like. I know I probably am not getting enough pressure for the vacuum to fully engage for 2wd. There is no loud noises so I’m guessing I didn’t damage any actuators or the actual IWE. I replaced the IWE solenoid and have a new check valve coming in the mail(ford didn’t have any gen 1). After replacing the solenoid I still have the same results. There is 100% vacuum pressure on the hoses but it’s not fully putting it in 2wd. After replacing the check valve the only other component would be the hoses/tubing correct? And if all that fails new IWE system? I feel like I am just having a vacuum pressure problem. If anyone could give me some more advice that would be great. I have a trip to Vegas next weekend and don’t want to go to the dealership. I can take videos if needed but DS axle spins forward and PS spins backwards in 2wd. Everything shifts between 2wd and 4wd fine.
