unknown noise
Junior Member
Joined: Sep 2021
Posts: 6
Likes: 1
unknown noise
Yes those open lines are breathers.
If everything else checks out you can check with a short section of hose right at the iwe itself. There is a diaphragm in there, if it leaks the iwe will need to be replaced.
I think there's 2 check valves, one between the engine and the solenoid and one between the solenoid and the wheels before it tees.
this video might be helpful
https://m.youtube.com/watch?v=tY7uB2rr5KQ
If everything else checks out you can check with a short section of hose right at the iwe itself. There is a diaphragm in there, if it leaks the iwe will need to be replaced.
I think there's 2 check valves, one between the engine and the solenoid and one between the solenoid and the wheels before it tees.
this video might be helpful
https://m.youtube.com/watch?v=tY7uB2rr5KQ
Junior Member
Joined: Aug 2022
Posts: 1
Likes: 0
Did you find out what the problem was? I have a 2010 4x4 and can’t figure out
My truck is making a clicking noise when I accelerate on 2wd after 20mhp. If I switch it to 4wd, it doesn’t make any type of noise
Senior Member
Joined: Jan 2020
Posts: 4,332
Likes: 1,091
From: utah
you will find many links. Fordtechmakuloco on YouTube has a couple videos showing how to diagnose and find your problem.
Basically the front hubs use engine vacuum to hold them disengaged. So you have a leak or a bad check valve or solenoid that causes the hubs to partially engage and grind when accelerating. When you engage 4wd it engages the hubs fully and no more grinding.