97 Altima loss of power. kind of stumbles below 40 mph as well

1 ANSWERS

1. paafamily
   

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   Automotive - 97 Altima loss of power
   Expert: Sean Halliday - 6/2/2006
   
   Question
   Today, while driving around I noticed that my rpms seemed to be moving around faster than normal. It seemed like the car was taking each gear up higher in the rpm band to go the same speed. I've had this car for 7 years and know exactly where the rpms should be at each speed and all of the speeds are off. Here are the differences:
   
   1. idle now at 1000, used to be 700.
   2. 60mph rpm=2500, used to be 2000.
   3. 70mph rpm=3000, used to be 2500.
   4. slow driving shift points usually at 2200 or less, now around 2800.
   5. am not getting normal "jump" or "thrust" when I hit the gas quick, cannot make wheels chip like normal when stomping on gas.
   
   The tranny is shifting perfectly smooth with no inconsistencies, it's not like its holding a gear, its like the engine is making less power. The car has 126k with everything original exept for plugs, wires, pcv valve, fuel and air filter. What do you think could be the problem?
   
   
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   Answer
   could be a vacuum leak.or the speed sensor.did your check engine light come on yet ,,you didnt say,my advice is to get a transmission expert to look at it,,the combination of drive and rpm is connected so the load on the drive is less making the engine rev more,,my guess is the tranny.it sounds like its slipping,did you check the ATF?...tranny fluid?if its ok then when was the last time you had the transmission flushed/oil changed and the filter.try it and see if it helps.

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