Greetings,

May I say that I have enjoyed reading the posts here...I have a bit of a problem... I have a '03 F150 V6 4.2L XLT... Its been a great truck, as of recently When I am idling low I will get a very loud rattle comming from under the truck. It only happens when I am in drive, stopped. In park it may happen if the AC is going. at normal idle it doesnt seem to happen.

I have taken a look under the truck to see if there was a loose sheilding around the CC or the Muffler, but nothing. I checked the radiator, nothing...I cant pinpoint anything that is loose.

Any ideas would be appreciated! Thanks!

=BigWill

 

There are ALOT of things that can rattle...it's hard to give suggestions.

I think you should try to get someone to sit in the truck and put it in park, hold the brakes, and you listen in the engine compartment and see if you can localize where it is coming from.

 

this thread from the exhaust forum might help...
https://www.f150online.com/forums/sh...hreadid=153098

 

I think that could be it! thanks for your help!!