Question about 2002 Mercury Cougar

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2002 Mercury Cougar Squeal

2002 Cougar 2.5L V6 M/T. There is a loud squeal when accelerating. Please read the rest before you respond. Happens at any speed, any gear, ONLY when you press the throttle to accelerate. RPM does not matter. Only happens when under load, ie: does not happen in neutral. Example 1: 35mph, 3rd gear, 3000+/- RPM, only pressing the throttle enough to maintain speed, no squeal. Press throttle just a hair more, and it starts to squeal. Example 2: 35mph, 5th gear, 1500+/- RPM, only pressing throttle to maintain speed, no squeal. Press throttle more, squeal starts, getting louder as rpms increase. Example 3: 55mph, 3rd gear, 4000+/- RPM, just maintaining speed, no squeal. Step on throttle, squeal starts instantly. It is NOT the belts, I removed both at the same time, still happens. Clutch is not slipping. No play in main crank. Sprayed starting fluid around engine intake while idling, no change.

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Just for testing, a few seconds, will the vehicle start and run w/o the belt? Have a helper work the throttle, is the sound gone? If problem not the belt, check the belt driven accessory. Sometimes you can use a long metal rod of some kind, with belt on, one end of the rod touches accessory housing, the other end goes on that bone behind your ear, helps to magnify the sound. I guess you could use a mechanics stethoscope to do the same thing. Have helper work the throttle while you listen to each. Don't get tool or anything caught in belt. This is a serpentine belt, I haven't looked?
Maybe an accessory trying to freeze up or bad bearing? I can't think of anything else at the moment?

Posted on Mar 11, 2017

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Posted on Jan 02, 2017

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SOURCE: engine stalls after cold start-up & release from high speed idle

I had a similar problem.  I found the filter cartridge below the pcv valve had carboned up, and after the crank case pressurized, oil was forced out the pcv supply line to the throttle body.  The idle air control valve solenoid got oil in it and caused my problem, but only when it was cold.  The pcv cartridge is accessed by removing the pcv valve and the rubber fitting that the pcv valve mounts in.  It can then be fished out with a pick set, and it is a pain because you can't see it, but you can get you hand back there.  I hope this helps you.

Posted on Feb 28, 2009

  • 238 Answers

SOURCE: 2002 merc cougar 2.5 liter has loud whistling

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

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