Moderator: volvite
I have a 2011 V8 model and have not experienced the funky shifting you describe when decelerating from highway speeds. What you describe sounds like the trans computer is searching for the proper gear between learned MPH shift points.str1ck wrote:Hello, I have a 2011 Pathfinder Silver. I am pretty sure my Tranmission isn't shifting properly.
1. It seems like my transmission likes to shift to 5th gear. Once its hits 35 mph the RPMS really bog down. Were talking around 1000 to 1250 rpm between 35 to 40 mph.
2. When under a load or declerating from highway speeds the transmission doens't seem to properly downshift. I will go from 60+ MPH and have to slow down due to traffic and when I get back down to accelerating its back down to 1000 to 1250 rpm. THe only way I can get it to downshift is to go to more than half throttle.
3. My truck has less than 2500 miles and is covered by a Nissan Extended Warrenty.
Please let me know if this is normal or should I call for a service appointment.
Thanks
Chris
I'm sorry but I don't follow the logic here. I've driven manual transmission vehicles in my younger days and any time I used the engine as a braking mechanism by downshifting during deceleration my gas mileage suffered due to the higher RPMs. Granted the throttle plate is not wide open when slowing down but in order to keep the engine running there's always a small amount of fuel being shot in the cylinders and turning more RPMs, regardless of how open the throttle plate, translates to more firing cycles and more fuel consumption. Am I misunderstanding what you're describing? Not trying to pick a fight but honestly want to understand since after all I think we'd all like to boost fuel economy in these trucks.hfrez wrote:Mine is the same way. I have learned to downshift manually and it works very nicely. I shift down to the next lowest gear when it gets to 1200 - 1300 RPM's. Coming off the HWY I can almost downshift it to a stop without using the brakes (when you do this you will see your MPG’s go up on the screen). In the city environment I will use the brakes and downshift. I know that this does not seem like something everyone would want to do (why else have an Automatic) but I used to have manual shift vehicles when I was younger and I kind of enjoy it.
Believe it or not, but the gas millage actually improves when you use this technique. I also keep it in 4th gear in city traffic by pushing the shifter from Drive to Manual, which automatically takes it out of 5th and puts it into 4th. I leave it there if traffic is moving slowly but will kick it back to Drive once traffic moves faster. The convenience of having the manual shift is that if I get tired of doing it I can always leave it in Drive and allow the tranny to do its job without me interfering.
You logic is sound; however, the fuel that goes into the engine during downshifting is less than allowing the engine to idle in a higher gear. I see your logic but the proof is in the pudding. My gas mileage has increased using this technique.Zen_master wrote:I'm sorry but I don't follow the logic here. I've driven manual transmission vehicles in my younger days and any time I used the engine as a braking mechanism by downshifting during deceleration my gas mileage suffered due to the higher RPMs. Granted the throttle plate is not wide open when slowing down but in order to keep the engine running there's always a small amount of fuel being shot in the cylinders and turning more RPMs, regardless of how open the throttle plate, translates to more firing cycles and more fuel consumption. Am I misunderstanding what you're describing? Not trying to pick a fight but honestly want to understand since after all I think we'd all like to boost fuel economy in these trucks.hfrez wrote:Mine is the same way. I have learned to downshift manually and it works very nicely. I shift down to the next lowest gear when it gets to 1200 - 1300 RPM's. Coming off the HWY I can almost downshift it to a stop without using the brakes (when you do this you will see your MPG’s go up on the screen). In the city environment I will use the brakes and downshift. I know that this does not seem like something everyone would want to do (why else have an Automatic) but I used to have manual shift vehicles when I was younger and I kind of enjoy it.
Believe it or not, but the gas millage actually improves when you use this technique. I also keep it in 4th gear in city traffic by pushing the shifter from Drive to Manual, which automatically takes it out of 5th and puts it into 4th. I leave it there if traffic is moving slowly but will kick it back to Drive once traffic moves faster. The convenience of having the manual shift is that if I get tired of doing it I can always leave it in Drive and allow the tranny to do its job without me interfering.