Question about 2001 Mercury Cougar

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Only runs ruff during park and idle.

My check engine light has been on for a while egr valve problem.This morning I went to crank my car and it idle very ruff only in park and idle if you hit the gas it smoothes out.

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  • Anonymous Mar 22, 2014

    Strong gas smell, rough idle and check engine light indicates P0400 EGR valve

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Your EGR valve shouldn't open up during idle or the engine will run rough and may even stall. Remove it and clean the plunger and port with a wire brush and some carb cleaner. Test the diaphragm with a vacuum pump. If it doesn't work after cleaning, or the diaphragm is bad, buy a new EGR valve.

Posted on Feb 06, 2009

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