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It sounds like a hydraulic that needs to move but is not able to.
Problem for Lincoln 2004 LS
I have a noise coming from the engine compartment
By william_damb on Oct 31, 2009
I have a noise coming from the engine compartment that starts at about 30 MPH and it stays steady no matter how much faster you drive. I've replaced the tires and have looked for loose panels or anything else that might rattle and no luck. It doesn't do it when the car is standing still no matter the RPM and the transmission shifts like normal and it doesn't change the noise no matter what gear it's in.
Clarification Request
Posted by c17hydro on Oct 31, 2009
What does the noise sound like?
Solution #1
posted on Nov 02, 2009
You still may have warranty left. Make it their problem.
But I would guess a PCV valve or an Evaporator cannister valve. You can check the EGR to see if it holds vacuum. There is also a breathing tube going from the exhaust to a EGR solenoid with 2 vacuum lines and 1 electric connection. Sometimes the tubes leak, if so good ol JB Weld will save you a bunch.
Remember some of these devices only work in DRIVE not Park or Neutral. A dyno rack is the only way to test them.
But I would guess a PCV valve or an Evaporator cannister valve. You can check the EGR to see if it holds vacuum. There is also a breathing tube going from the exhaust to a EGR solenoid with 2 vacuum lines and 1 electric connection. Sometimes the tubes leak, if so good ol JB Weld will save you a bunch.
Remember some of these devices only work in DRIVE not Park or Neutral. A dyno rack is the only way to test them.
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