Question about Mercury Cougar

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Why is my 2000 mercy cougar misfiring on cycliner 1. I changed almost everything under the hood and its still running really bad. I had got bad gas about a month ago and then thats when i notice it started running bad.

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Have you checked all vacuum hoses and pcv
hose for leaks ?

Do the spark plugs have more than 3 years or 70,000 miles
Did you change the front 2 -- O2 Sensors at 100,000 miles
Clean the MAF Sensor

Smoke test the intake for leaks

Smoke the EVAP System

Posted on Mar 19, 2011

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Keep going back to the dealer. This is an emissions issue and is covered under warrenty. If anyone else works on this you could void your warrenty for this issue. I know its frustrating but the dealer is the only way to go. Maybe you need a differnt technician to work on it or even a differnt dealership...
But if it were my car I would fill it up with chevron 91 and add two bottles of techron cleaner. At 1/2 a tank fill it up again run the remaining fuel to low and then hope it cleared up.
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This is about the only thing you can do at home.
You could try replacing the fuel pump relay and the ASD relay if you have them under the hood in the fuse box. There only about 15 to 20 bucks for the 2.
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I had the same kind of problem and I ended up solving it by actually checking for recalls for the 2000 Cougar and when you do, you'll see that there is a fuel pump recall. I dont' know if you've already done this but I figured i'd post this and try and help out!

Much luck

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