Having problems with your 2004 Ford F150 ?
4/04 ford f150 4x4 front axle actuator won' t stay disengaged
\015 With the truck in 2 wheel drive and accellerating hard, you can here the front axle actuators slightly engage. I have check all the vacumn lines found no leaks. I replaced the actuator on the right side,because it was mainly making the noise,but now the right still makes the noise and the left. If I put the truck in 4x4 it does not make the noise.It only makes the noise on hard acceleration, l have 25 in. lbs. of vacumn. but it acts like the actuators are loosing vacumn or leaking. Thank you,Mike\015
Even though you checked the vacuum lines and found no leaks it does not mean there isn't a problem. The check valve in the line closest to the firewall actuator is probably your problem. Had the same issue replaced this line and solved it. The check valves in the vacuum lines are your best next guess.
I had the same thing in 2005 stx f150 had to replace both actuators and rt side hub worn
Repair Help & Product Troubleshooting for 2004 Ford F150
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