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A whining noise during acceleration usually, is from the gear set, indicating the pinion is too close to the ring gear. I believe the eclipse is a FWD car though. Could it be the transmission you are hearing?
i would first check your surpentine belt to see if it is getting burnt up, most whining sounds are an indication of a bad pully either from the alternator,compressor, pwr steering pump, tensioner, idler pully,ect.ect., i would take the belt off and spin the pullys by hand untill you find wich one is bad
There is nothing that can make a whining noise in the back of the engine. Likely the noise you hear is coming from either the transmission converter or pump. Before anything else is done, check the fluid level. If the fluid on the dipstick smells burned, you definitely have an internal trans problem.
If it whines when in the 4x4 position but not at any other time then the noise you hear may be coming from the transfer case and is caused by the high gear load of driving both axles on a this type of surface. If you are driving in the 4x4 position on any dry hard surface you will hear some noise from the transfer case and usually it is a noticeable whine. Also, driving in 4x4 on a dry/hard surfaces greatly adds to the strain and wear on the power train. It would also be a good idea to have the both axles and transfer case fluid levels checked to be sure none of them are low. Hope this helps a bit and good luck!
well, without hearing the noise myself, i could guess that the torque converter clutch might be going bad. the torque converter is the part that transfers the power from the engine to the transmission via viscous fluid motion, the converter also has a clutch that internally provides a direct connection inside the converter for better fuel economy. but as with anything labeled as a clutch, it wears down to a point where is slips. the noise your hear could be the torque converter clutch slipping. i owned a 90 astro van with the same drivetrain that made a noise similar to what you speak of up hills. while driving up hills, fully depress the accelerator and if the clunking noise occurs, then the whine goes away as you accelerate faster in a lower gear, very likely this is the case. you would have to have a transmission shop diagnose further. i drove that old van for five more years cause i didn't want to pay to have transmission repaired. it can be very expensive.
Check the idler and tensioner pullys for your serpentine belt. I suspect the whining noise heard earlier was due to the fact one was getting a bit stiff or rough turning. When you gave it that extra fuel, the sudden load may have finished it off. Sometimes they lock up, and sometimes they fall apart. Check those items first.