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Loud knocking noise

Discussion in 'Transmission & Drive train' started by Dave_66, Nov 10, 2010.

  1. Dave_66

    Dave_66 New Member

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    I have a 2001 EB with the 5.4. About a week ago I started getting a loud knock when I started the car and it would go away after it ran for a few seconds. Yesterday I stopped at a stop light and the truck died (first time it ever happened) When I started it back up something broke and now there is a loud knock when it is a idle or when I pushed on the gas. Once I had it at 20 or 25 the knock would go away but as soon as it slowed down it came back. There is no smoke or oil leak as well as no warning lights coming on and the oil pressure gauge is fine. Can I get some ideas on what it might be? The noise seems to be coming from the bottom of the motor so would it most likely be the crank shaft?


    Thanks
     
  2. joezek

    joezek Full Access Members

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    Rod bearing knocks usually don't affect oil pressure. That could be the problem. The way I always check for a rod knock is by unplugging one spark plug at a time, if the noise doesn't go away then reconnect it and try the next cylinder. When you remove spark from the bad cylinder it will stop knocking (at idle).

    If it's a rod knock then the engine needs to be torn down and major engine work done.

    Is the oil full and clean? Have you checked other possibilities like various pumps that are on the engine? My A/C compressor makes some noise sometimes and it's on the bottom of the engine.
     
  3. Maurice J Wright

    Maurice J Wright New Member

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    I have a 03 5.4 expedition my engine has a hard nock and leaking oil from the bottom do any one have a clue what might be the problem
     
  4. riphip

    riphip Full Access Members

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    May be broken cam follower under valve cover. Get a piece of hose to listen over the valve covers to see if coming from either head locations
     

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