At idol it's fine, but when I put the truck in gear it sounds like a rattle or grinding in the blower.

Only when the truck is in gear and not moving I hear it.

Not saying it is grinding or it is the blower for sure, but that it where the sound comes from.

 

mine made a rattle sound in gear while I was stopped, sounded like it was coming from up front also. Turned out to be the cats, they fell apart inside and were changed out. Sure made a differance in sound and performance.

 

My truck is doing that pretty badly at idle. I figure its just a little cavitation caused by increased tolerances caused by rotor wear, but hey, that's just my opinion. Ive got another blower with about 17K miles on it and after FFW/Ennis will probably be doing a swap. A sticking IAC valve can cause the same noise.
https://www.f150online.com/forums/sh...+control+valve

 

**** some important info,

What mods do you currently have?
Miles on truck?


Brandon

 

Might be related to this......?

http://www.nloc.net/forum/showthread...=idler+pulleys

I'd also wait until the eng. is cold and then check the level of your s/c oil--should be right at the hole opening.

Dan

 

Truck has 7500 miles on it,

My mods

1.) 4lb lower pully, about 1000 miles
2.) Chip been on since 2000k then reburnt for pully
3.) Volant Intake 1500k
4.) Boost bypass 1500k

I checked s/c fluid when the engine was warm, it seeped out befre I get the screw all the way out.
So the fluid is good.

 

Any more opnions?

 

Check the exhaust too. I had a nasty noise on mine at 500 miles which was traceable to the muffle/exhaust configuration. After unbolting everything, giving it all a couple of swift kicks, then re-torqing everything the noise went away. There are a lot of 'weird' noises on the L's which are traceable to the unique exhausts on them.

It doesn't cost anything to loosen all the exhaust clamps, "tweak" the mounts, then re-tighten everything. Give it a try before you start looking into the other components.

 

****4: you're supposed to check SC oil when cold. It should be the bottom of the hole when cold. When the engine is warm, a little will always seep out, even if the level is low.