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Will a bad egr on ford mustang make very loud rattling or tapping sound like something is loose?

A faulty EGR (Exhaust Gas Recirculation) valve itself is unlikely to produce a *very loud* rattling or tapping sound like something loose. While a sticking or failing EGR can contribute to engine roughness and potentially some unusual noises, these are usually more subtle than a loud rattling. A loud rattle is more indicative of other mechanical issues within the engine.

Here's why a loud rattle isn't typically associated with a bad EGR:

* EGR Valve Operation: The EGR valve controls the flow of exhaust gases back into the intake. While a stuck-open EGR can cause a rough running engine, the noise associated with this is more of a rough idle or slight knocking, not a pronounced metallic rattle.

* Other Potential Sources: Loud rattling or tapping sounds in a Mustang engine are far more likely to stem from:

* Loose or damaged components: This could be anything from a loose heat shield, a failing rocker arm, worn piston rings, connecting rod issues, or a failing timing chain/belt.

* Valvetrain problems: Worn valve lifters, tappets, or pushrods are common culprits for rattling noises.

If your Mustang has a loud rattling noise, it's crucial to have it diagnosed by a mechanic immediately. Continuing to drive with a serious mechanical problem could cause significant and costly engine damage. While a bad EGR *could* contribute to *some* unusual engine sounds, a loud rattle points to something more serious needing urgent attention.

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