Question about 2001 Jeep Grand Cherokee

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Lose power uphill

No power when going uphill. Straight road enough power.

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Hot and cold engine, or both?
all times or just some times.?
In all gears, or just some.
which engine? we can not ever guess that. sorry
so will do Generic Otto cycle engines. (gasoline/petrol) answer.....

first poster assumes pump bad, nice guess, as are 50 more.
i can list 50 to 100 causes of low drive line power. (just a few today)
first lets do Macro way :

  1. lost engine power, (torque to wheels)
  2. transmission slips or fails to shift. amazing huh,
  3. Brakes dragging or 4 fat chicks in back seat (lol)
now pure physics, makes the list shorter, not 100 long)
lets say the fast checks above proves engine weak.
  1. lost of 1 or more cylinder compression.
  2. Lost spark (never did a tuneup this decade(like 90% never do)
  3. bad fueling, (too rich misfiring or too lean bogging?) or bad fuel.
  4. EGR stuck open, if you have one.
  5. Cat convertor melted, (a vacuum tests finds it like childs play (ask)

that;s it, ill leave the 50 to 100 parts bad for the guessing folks.
you can:
1: get it serviced.
2 : DIY, to the tests. using tools. (gauges) (buy them? they are cheap)
3: or GUE$$

it's your call.

now my wild useless guess based on statistics.
car never ever got a 60k mile service, tuneup.
spark parts, filters and the like> per operator guide on service?

Posted on Feb 06, 2015

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Can be several things. First is the normal maintenance performed? (plugs and air filter). If so, i would first look at fuel pressure at the fuel rail. Should be around 49 PSI (+-5 PSI). If low, change first the fuel filter/pressure regulator. If still low, then probably the fuel pump is getting bad.

Posted on Feb 06, 2015

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luis ,sounds like a clogged catalytic converter to me. does it sound like a giant vacuum cleaner? or a jet? you have a clogged converter. check for engine misfiring as this is usually the cause of the bad converter and will not help your power problem.

good luck

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