2009 Mercury Mariner: hesitation when accelerating

Filed Feb 8, 2016 · Acceleration, Engine · 89,000 miles · OH

Tl* the contact owns a 2009 mercury mariner. The contact stated that while driving approximately 25 MPH, the vehicle hesitated and lunged forward as the engine warning indicator illuminated. The contact powered the vehicle off and back on and drove the vehicle without incident, however, the failure recurred approximately two weeks later. The contact powered the vehicle off and back on, however, the vehicle failed to accelerate. The vehicle was towed to an independent mechanic and was diagnosed that the throttle actuator needed to be replaced. The vehicle was repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 89,000.

Filed Oct 21, 2013 · Acceleration · 97,000 miles · NY

While driving on the taconic state parkway, traveling at approx. 55 MPH, the engine failed to respond to the throttle and while the car was still in gear, the vehicle merely began coasting. I safely steered the car to the shoulder of the road, and turned the vehicle off. After approximately 2 minutes, I was able to re-start the car (with some hesitation). I then turned around to attempt to drive home. The same situation occurred one more time while traveling home (approx. 30 miles). I brought the car to metric motors of lake carmel, ny. Their computer diagnostics identified the problem as the throttle actuator control. They said that they unstuck the part (cost to diagnose & make repairs $422+) and I again began driving the car. Unfortunately, after visiting nyc on saturday, october 19, 2013, the same problem occurred, again while driving home on the taconic state parkway. I was able to start the car; however, the problem re-occurred approximately 10 more times over the 40 mile return trip to my home. Each time the engine failed to respond to the throttle and while stile in gear, merely began coasting. Each time, I safely steered the car to the shoulder, and eventually re-started the car and managed to make it home.

Filed Mar 20, 2013 · Engine, Fuel system · 35,000 miles · IN

While entering interstate highway, engine balked like bad gas. After two or three tankfuls and the vehicle dying in traffic, I left it with my dealer to find the problem. After a week, the vehicle had not died for them so I brought it home, only to continue with the same dying and hesitating when accelerated. A month or so later the dealer kept it again for about 5 days and it still did okay for them. They have no idea what the "problem" is. We have parked the car in our garage because several times we have narrowly escaped being rear-ended, when turning corners, crossing railroad tracks, etc. I contacted ford motor co. In michigan and they do not "have this problem with other vehicles" and don't seem to know what I'm talking about. Mechanics in two other garages have driven the vehicle and have not located the problem. Help!!

Filed Feb 9, 2013 · Engine · 2,300 miles · NJ

Within the first months of owning the vehicle, it staled randomly. I could be driving or idling and the car stalls. Ifi put in neutral or park, it was easily re-started. I have had the dealer look at it several times the problem still exists. Nothing showed on the computer.on many occasions starting in 2010, the vehicle hesitates when shifting. When I would accelerate after coasting; w aiting for a light to turn green, trying to leave a stop light or sign, or after making a turn, there was a lull where the vehicle was unresponsive. It then kind of lurches into gear. The dealer told me that's the way the 6 speed automatics worked and I should always come to a complete stop. This past weekend 2-3-13 was the icing on the cake. I took the car down to the shore to have a leisurely weekend b4 surgery. I started the car and the engine light came on. I followed what it said in the manual and the light did not blink 8 times. I performed the mixed city and highway driving followed by 8 hours or being parked, the light came on the next morning the first thing that happened was that the rpms went very high and it lurched into gear. The car stalled twice while I was doing about 35 MPH. I threw it in neutral and it started right up. Driving home , the engine light was not on but no dash lights, radio etc after about 5 minutes and noticed they came on. This happened twice. I had the heat on floor and front vents at 74 & at 1 point it felt like A/C was on. I filed complaints with (the federal safety agency) with no response. I see many of the same complaints I have on the federal safety agency that are unresolved. I have stage 3 cancer I have been battling for 9 yrs this situation is making me feel like the car is more dangerous than the cancer I am fighting. I'm putting myself at risk by driving it.

Filed Apr 13, 2011 · Transmission · 21,000 miles · TX

On multiple occasions starting in jan 2011, the vehicle would hesitate to select a gear and accelerate while trying to leave a stop light or sign, or after making a turn leaving a few second lull where the vehicle is unresponsive. The previous transmission software re-flash was performed again even though dealer was unable to replicate problem. Issue still persists occasionally, as well as a new symptom since march (23,000 miles). Now, sometimes when coming to a stop the vehicle will stall as though the transmission did not downshift to a lower gear. Placing the vehicle in neutral and restarting allows continued operation. These issues combined with inconsistency in shifting performance as noted by many others lead me to believe there is still a component and/or software problem with this 6f35 transmission. However, since the problem cannot be consistently replicated by the dealer they are unsure of a remedy.