I called in to check on a Nissan Versa, and it was sold the next day but Franky kept me updated with similar deals. I put some sealant on the connector some sort of sealant that came with the pump and bench tested the pump and test line again and it held fine. Next check your lines from the solenoid to the actuators at the wheel. While the engine is certainly less capable than its competitors, this is only noticed when towing heavy loads. The crew cab offers generous room and comfortable amenities for all passengers. Then you will want to check the vacuum reserve box that is mounted behind the battery on the battery tray.
If it does not then replace it. Hope this helps out some people! Pull those check valves off and check them. If it does not and leaks down, you have a leak in your lines between the solenoid and the actuators. If it is woking correctly you will be able to build up vacuum and it will hold. My truck is rather young,45k miles on her,just baffled at this whole thing. Or you can check it with the pump. One close to the intake and one in the same line close to the solenoid.
If you can not build vacuum or is leaks down very fast, the seals on the actuator are shot and the actuator needs to be replaced. If one or both of these fail, the high constant vacuum will not be held correctly in the system and while driving, the vacuum could drop too low and try to engage the actuators. Put your vacuum pump on the big hose fitting and pump up the pump. Check the lines very thoroghly from the solenoid to the wheels, its hard to get to some of the lines, but they all need checked, look for cracks or breaks. From the line coming off the engine connect your pump to the line and turn on the truck. .
The video above shows where the transmission fluid dipstick is located in your F-150 and how to check the transmission fluid level. If you are having problems with the transmission in your F-150, such as clunky shifting or hesitation, check the fluid level first - it is amazing how many drivers pay thousands of dollars for transmission work when a half quart of transmission fluid would have fixed the problem. When this little bit of vacuum is lost in the reserve it is then rebuilt from the engine when vacuum is increased from the intake. This is fine and wont cause any damage as long as the hubs lock correctly. It should pump and hold without any leak down.
When the system is working correctly, vacuum is placed on the system unlocking the hubs while the truck is running. When adding transmission fluid to your F-150, be sure to add it slowly as it will fill up quickly and is difficult to remove excess fluid if you overfill. Connect your pump to that end of the line and pump up the pump. If the vacuum you create with the pump holds your lines are good, but still look them over for obvious faults. I thought the transfer case was acting up causing the grinding noise. You will have to remove the battery and battery tray to access it. Again if the shift motor is working.
This will not allow any vacuum to reach the system and leave your hubs locked in all the time. Pull the double vacuum line off of both actuators at the wheels. Another pickup with a winch got me out. Pull the double vacuum line off the solenoid. Take your pump and connect it to the line end from the solenoid that goes to the wheels. Watch what poundage of vacuum shows up on your guage you will not have to pump it up should be anywhere from about 17 to 22. Im so excited the truck felt completely different now that everything up front wasnt turning as well.
Unplug the same line at the check valve that is close to the intake. . I currently still have the vacuum lines pulled and plugged until tommorow because i blew up the vacuum box while using compressed air blowing out the vacuum lines and the box wont be in until tommorow. I have an understanding of the system now. Its working the way its supposed to.
Anybody feel free to add to this, but i think i covered it pretty deeply. Ive read that 20-22 is normal but mine likes to hover around 18-19 at idle. If this reading is too low you might have another vacuum leak somewhere else on the engine. Maybe this can become a sticky! The engine in your 2006 Ford F-150 should be running when you perform a transmission fluid level check, otherwise it will be inaccurate. I put the new vacuum box on and hooked everything back up and took it for a 50+ mile drive, and success! The leak down never dropped below about 17 on the guage so it wasnt enough to do anything.