Ford F150 - 1998 4.6l F150 4x4 making diesel sound

MarcosE

Hello to all. My F150 since purchased about one year ago always does a clapping sound at all speeds and rpms. It's like it is a diesel engine. it makes a more pronounced sound when accelerationg. When removing my foot of the accelerater it is barely noticable... Any ideas could it be the valves, rods, Need help to make sure if it needs to be fixed and if it will damage the engine. ANY information will be appreciated.

Than you

marcos

pete59edsel · Posted: Mon Nov 05, 2007 3:37 pm Post subject:

Does it stop or go quiet when warm? Could be exhaust leak from the engine to the manifold. My 98 does it and I got a buddy with a 2001 does the same thing.
_________________
This is Ford country, and on a quiet night you can hear a Chevy rust.

2000Shocker · Posted: Mon Nov 05, 2007 3:54 pm Post subject:

Mine does this also on cold mornings because of the exhaust stud bolt broke off some time ago. I'm too lazy to attach the manifold back to it again but I will get around to it sometime. I'd check all your manifold studs for the problem.

MarcosE · Posted: Mon Nov 05, 2007 3:58 pm Post subject:

either it be cold, warm, the noise is still there. I have heard other F150 and expedition do the same noise. do I need to have this fixed at the dealer or what could it be?

pete59edsel · Posted: Mon Nov 05, 2007 6:23 pm Post subject:

No big deal, if you have extra cash go ahead. And no, not only the dealer can fix this, any muffler shop or do it yourself if your good with tools.
_________________
This is Ford country, and on a quiet night you can hear a Chevy rust.

MarcosE · Posted: Tue Nov 06, 2007 9:42 am Post subject:

what would the job be gto fix this? always though it was the valves or the lifters. what needs to be done to the exhaust part?

Thank you again.

Marcos

pete59edsel · Posted: Tue Nov 06, 2007 3:33 pm Post subject:

Look on both sides of your motor where the exhaust meets the engine, if it is what I think it is, you will see where the sound is coming from. A exhaust leak from your manifold that meets the motor, either passenger side or drivers, or.....maybe both.
_________________
This is Ford country, and on a quiet night you can hear a Chevy rust.

buckeye-basser · Posted: Wed Nov 14, 2007 12:41 pm Post subject:

What would I expect to pay to have this fixed. Mine is also doing this and it just drives me crazy.

bobmaggie · Posted: Sat Nov 17, 2007 6:05 pm Post subject:

I see this alot on motorhomes and it is bcause the factory does not use exhaust manifold gaskets. It is a big complaint on the V10's. if your good with tools and don't brake any of the bolts off in the heads you can do it in your driveway in a couple of hours. A shop could charge you $400.00 to $600.00 depending on there labor rate and if any of the bolts brake off. Good luck!