A drop in speed while going uphill is normal for most vehicles. If the speed is more than 20 mph slower than when first ascending the hill, there could still be a problem with the transmission or an oxygen sensor.
Tectonic plates that slipped.
Water can defy the force of gravity and flow uphill. This is possible when a device called a hydraulic ram is used. A wick action such as a rope can cause the water to flow uphill.
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Our Kia has an automatic transmission, on the side of the shift lever there is a button. when going uphill you can push this button and it keeps the transmission from shifting out. When this is engaged hold appears on the instrument panel. Hope this helps.
A slipped disc can cause nerve damage and potty problems.
Transmission temp sensor can cause a slip or high rpm before shifting to next gear.
Low transmission fluid, transmission on it's way out.
For a 1998 Plymouth Voyager that won't go into gear, the problem may be the shifter or the shifter cable. A problem with the linkage can cause it to not shift into gear. Also, check the transmission fluid to see if it's low. Even if it isn't low, you may need to change the transmission fluid and filter.
try changing the fuel filter
Does your car have overdrive? Does it stall when going uphill? If you answered yes to these it is possible that your transmission kick down isn't working.The kickdown basically detects when the car becomes under load and shifts the transmission down a gear.
It can cause seals to leak if you overfilled it. Drain the excess fluid out immediately, before you ever start the engine.
Strong uphill winds have pushed against the tree