buckdown90

Have a 99 ford f150 with intermittent engine chatter . This only occurs when the engine is warm. This video took me 15 minutes of idling to finally get the noise to come . In the winter months it will take well over an hour to get it to make this noise. It increases a little bit with acceleration and in and out of gear until about 1500 rpms then it dissapears or I cant hear it anymore due to road noise. Any ideas what it is and how to fix ? Run 15-40 ha! Threw some lucas in it and it didn't help much. Has been doing this for 5k miles seems like its mostly on passenger side or front of engine.

Martian

Moved to 1997-2003 and cleaned.

buckdown90

Anyone ?

buckdown90

bad fan clutch maybe ? I can spin the fan by hand but not super freely, i can only make it about a quarter revolution off a flick of the hand .

buckdown90

Found it I believe its in the altenator!

buckdown90

It was the alternator !