Question about 1993 Mercury Cougar

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The 1993 mercury cougar sounds like its idled too high...The idle screw was checked but that wasn't the problem.What could it be?

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Check your intake manifold gasket for leaks. You do this by running the engine and using a squirt bottle of water. Try to reuse an old windex or similar bottle that streams as well as sprays.

The idea is to have the engine inhale the water at the gasket seams. This will make the engine miss or stall and you will know where the leak is. The faster idle is due to the engine getting more air than the throttle opening is set for.

If you do not find any leaks at the intake manifold, use the spray setting and follow the vacuum lines to the components they are plugged into. Spray the components and vacuum lines to find cracked lines or cracked components that are venting vacuum.

If everything is sealed then go to Autozone or Oreillys and get a free scan on your car. They can tell you how fast your car is idling with a second gauge. Sometimes a throttle position sensor can be bad and cause this problem.

Posted on Apr 25, 2010

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