4wd tries to self engage
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Joined: Dec 2011
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4wd tries to self engage
2008 f150 5.4 4wd 22,000 mi driving normal get grating noise sounds like xfer case trying to engage, turn 4wd *** to 4wd hi then off noise goes away. Sometimes it happens several times in one day then nothing for months. Apreciate any ideas. Thanks Walt
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Joined: Dec 2011
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Had the same problem with my 04 f150 like he said sounds like a vaccume problem. That what mine ended up being, found it after gave up on the dealer as it was under warrenty. They replaced killed hubs 7 times and never fixed it, turned out had a torn vaccume line at the hub, would also look at solenoid as they are problematic also. When i did mine the dealership gave me the parts as was on warrenty yet and i replaced both hubs, vac lines and solenoid never had another front end problem but wont talk about trans.
Laughing Gas
Joined: Aug 2004
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From: P.G. VA
If its like mine its actually a hub partly engaging. You either have a vacuum leak or a moisture issue. At least that what my problem was. I made a hood to cover my solenoid and after a month or so it apparently dried up and havent had any more issues. This was three years ago and everything works fine currently.
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Had a similar problem like this. It was trying to engage and made a racket like those old things you put on bicycle rims way back in the day that hit the spokes and made the crazy sound lol...best way i can describe it. It was a vacum problem but not a line. Im not sure of the correct name of it but i think its called the hub accuator on the inside of the wheel. Its round and has two vacum line going to it. I can take a picture of it tomorrow and send it to you if you want. It took the shop about 2 weeks to identify the problem! Might be your problem, might not be but its worth checking into i think.
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