They will tick at idle and maybe up to 1000rpm if they are weak.

 

well I filled up with 93 octane and the rattle (detonation) went away. Took about 10 miles to notice it. So looks like I will be running 93 til i get a tune. The only rattle i get is when im on a hill and floor real quick and I get a slight rattle. I think it still does it cause of the high airflow coming in and the fuel not keeping up. Plus it being cold out too. I dunno.

Let me know what yall think

 

Next tank, try 89.

 

Yea thats not a bad idea. We have 91 hear as well so i'll be trying that next.

Yeah we use to have 87 89 93 94

now its................... 87 87 91 93

 

Mine used to chatter when I would get on it. Usually after 4K RPM.
After I switched to 10W 30 Mobile One Syn, no more chatter.
160K now, runs awesome!!!!

 

low fuel pump volume or pressure will also cause detonation

 

How about a fuel filter change? I have owned the truck for 35K and it has never had one that I know of.

 

Definately.

https://www.f150online.com/forums/sh...ht=fuel+filter

I got rid of pinging by changing the fuel filter, which was in there for 146k miles.....I got a thread around here somewhere about that.

https://www.f150online.com/forums/sh...ight=high+idle

The explanation is right above your post here.