I have been looking around this site to fix my wifes 2000 Cougar. I found this thread. I wanted to add some good accurate feedback.
Our 2000 Cougar was hesitating/buckling and never went over 4500 RPM. It started fine, ran fine, but when you accelerated, the problem became more apparent. This car has about 136k miles on it. I am not sure if the previous comments are accurate, My problem was fixed after I replaced the
"Transmission Range (TR) Sensor" I think I paid $56 for it. This verbage and picture attached is right out of the 2000 Mercury manual. It outlines the need for a special tool called a "TRS Alignment Tool" I did not get this tool, I used the manual I have online from Alldatadiy.com
This sensor monitors the position of your transmission. After installing it, it was a night/day difference immediately. It solved my problem.
The sensor is mounted on top of the transmission, mine is automatic. Just under the battery tray.
Now the car is hesitating when cold and light accelerating, I think it is the EGR valve or the DPFE senser (Differential Pressure) which is also a part of the EGR system.
Good Luck to all.
Wednesday, October 7th, 2009 AT 9:01 AM