golfdude

anybody out there run into this problem? have an 05 Ford F150 Lariat 4x4. when i step on the accelerator and hit 45mph and up i get a loud rattling noise from the underside of the motor on the drivers side, when i let up on the accelerator the noise goes away. any Ideas!!!!

thanks

Cold

I have the same thing but its a fast rattle i can get out and back in and it will go away hope someone can help us its annoying i can rev mine in park and hear it also

torqgasm

Check for vacuum leaks in the 4wd system,its probably the hubs rattling (grinding)when the trucks under load.There is a great thread on this site that takes you step by step to troubleshoot this problem.

aidswolf

link to thread?

2000MTZ

iTrader: (1)

Ive got the same problem, and i was told it could be a bad knock sensor

Well mine does it whenever i hit the accelerator

torqgasm

https://www.f150forum.com/f4/4x4-tro...g-guide-39789/ try this link

torqgasm

http://www.f150online.com/forums/200...then-some.html This was the link I was looking for

Cold

But I got a 4.6l 2wd and i got it toooooooo...

torqgasm

Cold, check all yer heat shields I had that rattle too

Cold