To test, jack the front of the truck up and test if both front wheels are free spinning.īefore you run any tests make sure the bottom vacuum lines are connected back up. That would provide a permanent vacuum when the engine is switched on and sucks the diaphragm from the IWE back in, allowing the front wheels to rotate freely. To test for vacuum, you remove the hose from the check-valve connection and stick it in the second hose that feeds pressure to the IWEs. The second hose should only have vacuum pressure once 4WD is engaged. The one line (check valve) should have a constant vacuum when the engine is running. There are 2x vacuum hoses held together with a black plastic housing. So to test for vacuum, you need to remove the vacuum hoses from the solenoid which is located against the firewall. You won’t even need a vacuum gauge to accomplish this or any fancy testing equipment. What you want to do is, test the vacuum line for pressure. It is usually situated on the passenger side of the truck next to the battery. The first thing you want to do is locate the solenoid. The purpose of this test is to make sure your system has vacuum pressure and that the hoses are void of any leaks and cracks. Your first point of troubleshooting should be to locate the vacuum system.
So what’s the first component we need to find? You just need to understand how the 4WD system works and where to look. The nice thing about diagnosing the F150 is that you won’t need any high-tech equipment and specialized tools to diagnose the problem. Ford F150 Grinding Noise When Accelerating In 4wd.How Do I Fix My Ford F150 4-Wheel Drive?.2007 F150 4-Wheel Drive Problem (Not Engaging).
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