'99 Expedition engine knock
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Freshman User
Joined: Sep 2003
Posts: 44
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From: Oklahoma
'99 Expedition engine knock
Hello,
I've got a 99 Expedition with roughly 85K miles on it. I have the 5.4 V8, 4WD. Over the past month or so, I've noticed a distinctive knocking noise when the engine is cold (first started), regardless of outdoor temp. This goes away fairly quickly but not until the engine warms up a little. Has a bit of a diesel engine sound to it.
I took it to the dealer today and he told me the 5.4 is notorious for this noise and that it's not a problem, there is nothing wrong with the engine and it won't cause a problem down the road.
Anyone know of this peculiarity with the 5.4 V8?
Any suggestions?
Thanks
I've got a 99 Expedition with roughly 85K miles on it. I have the 5.4 V8, 4WD. Over the past month or so, I've noticed a distinctive knocking noise when the engine is cold (first started), regardless of outdoor temp. This goes away fairly quickly but not until the engine warms up a little. Has a bit of a diesel engine sound to it.
I took it to the dealer today and he told me the 5.4 is notorious for this noise and that it's not a problem, there is nothing wrong with the engine and it won't cause a problem down the road.
Anyone know of this peculiarity with the 5.4 V8?
Any suggestions?
Thanks
Senior User
Joined: Feb 2004
Posts: 105
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From: Juniata County, PA
sounds like it might have some piston slap, fords are known for this when cast blocks and aluminum pistons are used. each expands at a different rate. i wouldnt worry about it as long as oil pressure is good and it goes away when it warms up.
Senior User
Joined: Jul 2003
Posts: 289
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From: Kansas
DKRoff
The noise you hear is pretty common in the 4.6 & 5.4 , especially this time of year. There's quite a bit of debate regarding the cause: piston slap / timing chain tensioners / valve train clatter / wrong oil. If you run a "Search" for engine noise at start up, or piston slap you'll find a lot of info. Also, be sure to check the "4.6L, 5.4L, Modular V8" forum for issues specific to those engines.
The noise you hear is pretty common in the 4.6 & 5.4 , especially this time of year. There's quite a bit of debate regarding the cause: piston slap / timing chain tensioners / valve train clatter / wrong oil. If you run a "Search" for engine noise at start up, or piston slap you'll find a lot of info. Also, be sure to check the "4.6L, 5.4L, Modular V8" forum for issues specific to those engines.
Last edited by gkbid; Mar 2, 2004 at 04:04 PM.
Logistics Pro
Joined: Oct 2000
Posts: 3,960
Likes: 5
From: All over Texas
With 85K miles in a '99 model consider yourself somewhat lucky you've made it this long without the piston slap or oil leak at the right head gasket. Like the others have said, don't worry about it until it gets unbearable. At that point, time for a rebuild...hopefully a couple years from now.
New User
Joined: Nov 2003
Posts: 10
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From: florida
DK
my 99 with a 4.6 did it at 35,000 when cold (ambient and engine temp) after driving long distance (200 miles or so) and running motorcraft 5w20 with a motorcraft filter. changed to motorcraft 10w30 stayed with motorcraft filter (other filters caused valve train noise when engine was cold) and the distinctive "knock"
"knock" went away(41,000 miles no knock). I belive their is a few service bulletins on this but I havent seen them (check mycarstats.com)
my 99 with a 4.6 did it at 35,000 when cold (ambient and engine temp) after driving long distance (200 miles or so) and running motorcraft 5w20 with a motorcraft filter. changed to motorcraft 10w30 stayed with motorcraft filter (other filters caused valve train noise when engine was cold) and the distinctive "knock"
"knock" went away(41,000 miles no knock). I belive their is a few service bulletins on this but I havent seen them (check mycarstats.com)
Elder User
Joined: Nov 2002
Posts: 736
Likes: 1
From: Texas, USA
If you are not sure where the sound is coming from, use a stethoscope or hold a peice of tubing up to your ear and move the other end around the engine while it is making the racket. You can tell if it's chain, valves, or pistons. Be careful of the fan!
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Freshman User
Joined: Sep 2003
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From: Oklahoma
Thanks for all the replies. The dealer gave me a Ford service report stating basically what he told me over the phone.
It's for some of the 1999-2003 vehicles with the 5.4L or the 6.8L. Said not to worry about it, there shouldn't be a problem. Hope he's right.
I'm running Castrol 5w30 with a Wix filter.
Any better suggestions on this?
It's for some of the 1999-2003 vehicles with the 5.4L or the 6.8L. Said not to worry about it, there shouldn't be a problem. Hope he's right.
I'm running Castrol 5w30 with a Wix filter.
Any better suggestions on this?
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