Question about 2002 Mercury Cougar

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2002 merc cougar 2.5 liter has loud whistling

2002 merc cougar 2.5 liter has loud whistling noise in intake area when started and increases with acceleration

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  • Anonymous Mar 18, 2014

    code 442 is this code the same on all automobiles, 02 merc cougar

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  • 238 Answers

Sounds like a vacuume leak, use some carb cleaner in a spray can and gently spray the engine. When you find the leak the engine will stumble, check in that area for the leak.

Posted on Apr 26, 2010

  • westof196999 Aug 29, 2010

    thats not a good fix. its very easy its your Idle Air Bypass. repace that and it will all ge better.

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Posted on Jan 02, 2017

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1. With the engine running at idle and the transmission in Park or Neutral with the parking brake set, feel for boost air escaping at each connection between the turbocharger compressor outlet and intake manifold. For limited access areas, spray soapy water on those connectors and look for bubbles.

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I assume that the noise changes with engine RPMs, not vehicle speed since you mention washing down the engine - something pretty hard to do if the car is going down the road-
Is it possible that what you describe as a squeak is instead a whistle? The symptoms you mention related to water could mean that an intake manifold gasket (or another part of the intake system) has a bad gasket and is causing a whistling noise from air being pulled in where it shouldn't happen. If the failed gasket is allowing water into the intake system, that would explain why the engine sounds like it wants to die. 
You might take a 2-foot length of vacuum hose or similar, hold one end to your ear and move the other end around the engine to see if you can more accurately isolate the source of the noise, be it squeak or whistle.    Obviously, don't hold the hose too tight in case you get tangled up with a belt or rotating part.
Good luck-

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