Edmunds Answers

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  • avatar karjunkie 06/15/10 8:56 am PST

    You have an FX4, so it's most likely your Integrated Wheel Ends (the vacuum actuated hubs on the back of the steering knuckles) have a vacuum leak. It you start to loose vacuum, then the ring gear starts to partially engage the hub. That would lead to a displeasing grinding sound. The best way to check the IWEs is to put the truck in 4WD the minute you next hear the sound. If the sound goes away immediately, then that is fairly consistent with an IWE vacuum problem. You should also inspect the vacuum lines to the IWE solenoid and pull the vacuum lines to make sure there is no water in the lines. It is a fairly common problem for water to get into the vacuum lines and damage the IWE solenoid. Good Luck.

Answers

  • karjunkie 06/15/10 8:56 am PST

    You have an FX4, so it's most likely your Integrated Wheel Ends (the vacuum actuated hubs on the back of the steering knuckles) have a vacuum leak. It you start to loose vacuum, then the ring gear starts to partially engage the hub. That would lead to a displeasing grinding sound. The best way to check the IWEs is to put the truck in 4WD the minute you next hear the sound. If the sound goes away immediately, then that is fairly consistent with an IWE vacuum problem. You should also inspect the vacuum lines to the IWE solenoid and pull the vacuum lines to make sure there is no water in the lines. It is a fairly common problem for water to get into the vacuum lines and damage the IWE solenoid. Good Luck.

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