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Check exhaust system for a leak Well, if it's a 2.0 SOHC engine commonly found in the 2000-2004 LX models, it's probably the EGR inlet tube. It looks like a copper tube running out of the front side of the engine, and hooks up to the exhaust manifold with a rectangular bracket held on by two bolts. The engine moves a bit under torque, and this part doesn't. It eventually develops a leak where the tube meets the bracket. You can probably fix it temporarily using JB Weld but it will eventually break again...

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Q: Why would a Ford Focus engine sound so loud but smooth and why would it idle so hard?
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