1990 4.9 tapping at idle
 

I have a 1990 f-150 4x4 4.9 300 cid that has a tapping sound at idle. the noise has always bin there as long as I have had the truck(2yrs.) but it seams to be louder since I changed the oil and filter. I used a 10w-40 the noise is only there at idle any slight throddle change and the noise is gone.also it seams to be worse when it is warmer.

valve clatter?

What brand oil filter? Get a motorcraft on there and I bet it goes away...

Adrianspeeder