engine knock

[MrMowgz111]

I Just got this truck 2000 Ford Expedition 5.4 eddie bauer V8 and now there's a knocking sound in the engine. I don't know that much about motors just the basics. But it runs and sounds fine when idling, just when I press the gas do I hear the knocking noise. Is this a bearing ? How much does it cost to fix? Could it be something other than a bearing ? It was extremely low on oil as well when I got it.

 

[stamp11127]

Post a video with good sound so the experts can all chime in. If it sounds louder underneath then it may be a rod knock. Better to hear the type of sound it makes and the frequency compared to engine rpm before accurately giving a diagnosis .

 

[46L281GT]

Not to jump the gun, but I had this happen to my 4.6 in my Mustang. Ended up being cylinder 8 rod bearing. It had got low on oil. Mine had a knock only around 2000-2500 rpms

 

[MrMowgz111]

My truck is with my mechanic now. But I never really pinpointed where the noise was coming from if it was top or bottom. But I'm guessing it was bottom.

 

[MrMowgz111]

Hey 46 guy.. Yeah that's about when the knocking noise starts is when it gets up to 2000 rpm . so you gave me good hopes that it's nothing really serious and it'll be fast and easy to repair.

 

[46L281GT]

It wasn't too bad. Had to get an oversized bearing and polish the crank shaft