Mechanics

BUCKING

2000 Mercury Cougar

Engine Performance problem
2000 Mercury Cougar 6 cyl Two Wheel Drive Automatic 114000 miles

I have a 2000 mercury cougar which has been great up until now. This problem has been going on for a few weeks and no one seems to be able to solve it. After driving about ten miles when the car gets warm it begins to surge and buck. I first thought it was the transmission and took it in to be checked. They told me they thought it was and engine misfire. I took it to another shop and they replaced plugs, plug wires, o2 sensor, fuel filter, belt on the water pump. It is still doing the same thing. I have since been back to the transmission shop and they still believe it is and engine misfire. I know that the fuel pump on this car was recalled. Could that be causing this? Please help I don't know what else to do.
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Rimage
April 8, 2008.




I'm having the same problem. I have a 2000 Cougar with 85,000 miles on it. The car is fine at lower speeds but once I exceed 45 or so the car begins to buck. I haven't gotten it into the shop yet but I plan to in the next week or so. Please post if you find any solutions to the problem. I will let you know what I find out.
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Tiny
Snowmom26
Apr 17, 2008.
I am having the same problem. The codes read off for a egr valve. Well I went to the local advance and bought a egr valve that costed $63.00. Put it on cleaned out all the ports with carb and choke cleaner scrubbed them with a brush put the new one on and dang if it didnt start jerkin and shaking again. The only thing that I could come up with would maybe be the maf (mass air flow sensor) that would be causing the misfire. Let me know if you find out what it is.

Tiny
Humpy*82
Apr 22, 2008.
I had the same problem with my Cougar bucking and hestitating and found out that there was a bad temperature sensor on my automatic transmission which caused the bucking problem after driving 10 or so miles. Once I had the sensor replaced, the problem ended. Unfortunately, only a Ford dealership with the diagnostic tools can find the code as I had to go to 2 other non-dealership shops who couldn't find the problem before going to the dealership and getting it diagnosed.

Tiny
Azncat
May 5, 2008.
How much was the sensor and where did you get it at?

Tiny
Humpy*82
May 5, 2008.
Sensor was about $50 but it was the labor cost that killed me from the dealership, about $350 because the sensor is in an inaccessible area. As I said, I went to the dealer to do a diagnostic as the other places I went to couldn't figure out the problem and didn't charge me for it. I might have had the same problem or maybe it is different from yours, but it solved my problem.

Tiny
Azncat
May 5, 2008.
Well the problem that im having is it runs great until about 10 minutes down the road the rpm's will jump to about 4000 then kick back in which makes the car buck. Sometimes it runs fine, other times it does terrrible. Its mostly just above 45mph. Do you get the part from the mercury dealership or from the ford and cross refrence it with a ford contour?

Tiny
Humpy*82
May 6, 2008.
Sounds like you had the same problem I had where I had the engine surging after it got hot. The dealer got the part for me and put it in. Since it uses the Duratec engine, probably same part as the Contour. The headache with both cars was that the really squeezed the engine into a small space compared to the space in the Taurus for the Duratec so that it is really difficult to do a swap and replace on the module hence the high labor.

Tiny
Azncat
May 6, 2008.
I'm having the exact same problem. My car is currently in the shop and it read out a code for a bad mass air flow sensor. They're going to run some more tests to try and diagnose exactly what the problem is before they replace the mass air flow sensor which I believe costs around $300. I'll update when I get some more info.

Tiny
Snowmom26
May 9, 2008.
I'm thankful I found you guys. I have a 1999 Cougar with 109,000 miles. I have done everything it has ever needed (which has been a lot), and lately it started jerking and choking at high speeds, going up hills, or passing other traffic. I took it to my normal garage the week before last and paid $1K which included new spark plugs, fuel filter, carbon cleaned out and some other small things. They said the problem was solved but I think it's even worse now. I went back last week and they found nothing wrong. I'm really frustrated with this car. Tonight on the way home my check engine light started flashing while the car was jerking so I figured the car was misfiring. I'm more than willing to have a temperature sensor put in if you really think that'll fix the problem. Please help.

Tiny
Dash944
May 11, 2008.
I have a 2000 cougar with a 2.5l v6 with 246000km (approx 152,000 mi), I changed my plugs about 3 weeks and and within 2 days of changing my plugs my engine light came on. It is also blinking at me. I asked my machanic why my engine light would be flashing at me and with new plugs my my car would be hesitating. He told me it more than like a bad plug that was misfiring.

Tiny
Mrchips
May 23, 2008.

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