5.4 knocking noise
Thread Starter
|
New User
Joined: Jul 2012
Posts: 9
Likes: 0
5.4 knocking noise
i have a 1999 f350 with the 5.4 in it, i started hearing a knocking noise, which has progressively gotten worse. is there anything i can try to cure this without having to do a complete teardown? trying to save money, so would rather spend a little rather than a lot if u know what i mean... suggestions?
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
Hello bynack23 and welcome to FTE.
When do you hear this knocking noise? Engine start? 70 MPH? Turning left in a rain storm?
My first reaction would be to say it is piston slap.
When do you hear this knocking noise? Engine start? 70 MPH? Turning left in a rain storm?
My first reaction would be to say it is piston slap.
Posting Guru
Joined: Aug 2007
Posts: 1,858
Likes: 6
From: laporte in
I've heard a lot of 5.4s and 4.6s with this "knock"
I think it has something to do with the timing chains, but I'm not 100% sure. Me and my dad(who is an ASE certified master mechanic) came to this conclusion after he fixed someone's 5.4 in a 98 f150 that broke a timing chain. They thought they toasted the motor until we looked at it and saw the broken timing chain. They complained of a knock also. We ended up replacing the heads and both timing chains and the vehicle never knocked since.
I think it has something to do with the timing chains, but I'm not 100% sure. Me and my dad(who is an ASE certified master mechanic) came to this conclusion after he fixed someone's 5.4 in a 98 f150 that broke a timing chain. They thought they toasted the motor until we looked at it and saw the broken timing chain. They complained of a knock also. We ended up replacing the heads and both timing chains and the vehicle never knocked since.
Thread
Thread Starter
Forum
Replies
Last Post
