I have a 2008 Edge SEL AWD and up until 7 months ago I had no trouble at all out of the vehicle. I've owned the car since 2010 and it had 50,000 miles when I got it. I had the Transmission Services at 100,000 miles, but around 107,000 miles while driving down the highway the vehicle seemed to lose power, all the lights started flashing on the dash, speedometer went to zero, odometer turned to lines, etc. To make a long story short took the car to the Ford dealership and the TSS and OSS sensors were replaced and the car drove great again for awhile.
I will point this out before the dealer checked my car and I told him what was going on he said 'well with that amount mileage it may just be time for a new transmission.' Not sure if it's just me but replacing transmissions at a little over 100,000 miles is not normal. I have a 2001 Pontiac Grand Prix Supercharged with 205,000 miles on it and the transmission had to be replaced at 201,000 miles.
Anyways, about a month after having the the sensors replaced in the Edge I noticed the car was slower to take off from a stop at lights, it also began to jerk and lose power going uphill. So in October I had the spark plugs changed and the jerking and power loss uphills went away, problem solved. Now my issue is the still remaining slow take offs from stop at lights and occasional clunking when going at speeds of about 10 mph. I have noticed with the slow take off issue my RPM's would go up a little higher as if my shift points are off but never over 3500 rpm. It's possible the car is taking off in a higher gear, I'm not sure because I'm not very vehicle mechanics savvy. I plan on taking it to the dealership to get checked out but I'm afraid it'll end up automatically being a worst case scenerio type of situation with those guys. I'm just wondering if anyone can spare a little knowledge or insight from experience with this type of vehicle, so that I know what to say to the service advisor. Also, I am wondering if having the PCM reflashed since it's never been done (atleast since I've owned it) would be worth it or possible considering the vehicle mileage.
A little more information about my vehicle: It now has 115,000 miles, the current issue has been the same from the start. I just noticed one day take off was slower and rpm's/shift response a little different, it hasn't gotten any worse nor has it changed in anyway. It's as if this is a normal behavior for the car, but I know it is not. Also, the service engine nor any other warning lights have come on, not even when the spark plugs were causing the jerking problems. My vehicle had a 100,000 mile warranty so as you can imagine I'm pretty sad that all this is happening now.