After engine gets hot, I lose power going up hills. The rpms drop to about 2000 and it just slows down to about 30 miles per hour. The tansmission fluid smells and looks o.k., it just feels like it isn't getting any fuel. However, as soon as I start back down hill or top out and get on level ground, the rpms pick back up and everything is fine.
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The electronic throttle actuator (throttle body) can fail causing a loss of power ... start it studders like it is running on 2 cyl. then switches to 3 cyl. then to 4. but ... Throttle body replaced on my 2006 Nissan Sentra 1.8 engine. ... I Was going up a hill and I tried to speed up, all of a sudden my car bogs down and completely dies.
if the transmission dont slip that means the engine lacks power.
this can be from forgetting to do tune ups>? every 60k miles. or per the operators guide, some cars need spark plugs every 30k did you RTM read the manual yet>? please do.
in order of likely (not physics)
bad spark (misfire) induced low power.
bad fueling lean
bad fueling too rich. (more misfire spark plugs turn black (tips)
bad engine. (compression loss)
the rare CAT melted, (inside) and getter worse.
to solve a riddle we do tests. simple tests with simple tools.
do you want to guess or test. it's your call.
If you feel it in the brake pedal and/or steering wheel you have a bad brake pulsation in the front brakes. Just replace the rotors as having them turned or machined will make them warp sooner due to the loss of material from machining. More cost effective to just replace them. If this vehicle has a 4 speed automatic......shift down into D to hook-up to the engine thru the transmission to help slow the vehicle down long hills like mountain driving. GET IT OUT OF OVERDRIVE TO SAVE THE BRAKES. Hope this solves your problem.
When you say it loses power, do you mean electrical power or engine power ? You would need to look at the fuse boxes for a loss of electrical power, and use a scanner or code reader to check the computer for trouble codes for a loss of engine power.
the catalytic converter most likely is no the sorurce of the problem, older design bead type Cat converters used to plug, but it is very rare on the newer ceramic honeycomb cats, u need to have the electronic engine control tested, are u getting a check engije light? if not has the fuel filter been replaced every 30,000 miles? also a part called the Mass Airflow sensor can cause these symptoms as well as igntion system problems.