Rpm problem hi  i got  nissan pathfinder  2001  and  when i start  up the  car  early  in the  morning  the  rpm  goin  up and  down

Stuck EGR valve?

Have you tested the battery, and are the cable connections clean and tight ?

I had that same issue with my 2004 Pathfinder and it was the fuel filter. (Was supposed to have been replace during a service, but obviously wasn't when I changed it)

Do you mean upshifting starts way early? Going from 2nd to 3rd in other words?
Ireally don't know your transmission,but the alternator problem might've possibly spiked and hurt your shifting solenoids in the ******. don-ohio (:^)

If you are getting at least 17 mpg in the city, and 20 on the highway, then you are doing good. The Pathfinder is not known for its fuel economy. I own a Pathfinder and if I can keep the RPM's under 2k then my mileage increases.

Hi,
That squeal could be just the belts, when starting at cold belts tendency is to slip and made some sounds. Check on that in early morning and start your engine and look at your engine to identify the sounds.
The bearing would be in the idler bearing that tightens belt of your aircon compressor.
Hope that helps you out!
Thanks for using Fixya!

It sounds like the input or output speed sensor may have been unplugged or damaged during the oil change.

early electronic ignition model i think if my oldtimers memory is correct ,try changing the ignition module ,i think it either under the coil or inside the distributor

check your catalytic converter could be clogged almost positive it is half clogged anyway.inspect the front side.

Hi I am Vortash it sounds like when they expand in the heat the activator coils are clear of the magnets giving a good sound .. but when cold they contract touching the magnets and you get poor vibrating sound ,, ? the problem may be two fold .. spaekers not man enough to take ower from unit .. especially if you have replaced the unit as most cars are only fitted with 10watt 8ohm to 4 ohm speakers as standard , and some of the newer cd players start at 25 watts this will disstort the speakers and they need replacing .. if this is not the case and you only have a low powered system usual culprit is water seeping down windows onto speakers at night from damp or early morning dew .. wet speakers tend to disstort.. hope this helps regards vortash