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F-150 rough idle wi...
 
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F-150 rough idle with defrosters on

  

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Hey all,

move got an 02 f-150 with 142k miles. It’s a 4.6L v8. So whenever I turn on my defroster my truck idles roughly as if I’m giving it gas even if I have it in park foot off the brake. I don’t have an engine light for an Egr pressure valve sensor however I did replace that and the problem was still persisting 


1 Answer
2

Turning on the defroster activates the AC compressor which may have a bearing problem and is loading the engine down.  Check the AC compressor.


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