1999 mitsubishi eclipse automatic transmission wont shift into 4th gear.

SOURCE: 1993 mitsubishi eclipse

the CHILTONS 1990-1993 Mitsubishi eclipse repair manual has extensive electical,vacuum and other such diagrams fo this vehicle about $25 at auto parts store or online. this is probably one of the most extensive resource on this vehicle, well worth the money. in fact in most cases it payes for itself the first time you use it. (in savings on mechanic/repair shop visits. it has trouble shooting and a comprehensive chapter on every system in the car.

SOURCE: 97 mitsubishi eclipse transmission problems automatic 2.0

I have a 95 Eclipse and I recently had to change out my TCU........ Transmission Control Unit, This should be located directly beneath the center console. First I would have the transmission services if problem persist then proceed to changing out the TCU you can get off of ebay. As far as i know there should be 3 Computers in our cars. 1 the Electronic Control Unit located behind radio 2 Transmission Control Unit located under center console and 3 Airbag Control Unit located under hood, Hope this helps.

SOURCE: my transmision does not shift up

Make cure ALL Plugs are Pluged in Good

SOURCE: transmission problem stuck in sport shift mode

I also have a 2009 Outlander Sportronic transmission with a V6 engine.
Bought it this summer ... transmission appeared fine but seemed to automatically slow down the vehicle using the engines compression whenever I let go of the gas pedal.
Now that the cold weather is upon us here in Canada, whenever I accelarate normally (not like a teenager) the transmission takes quite a bit of time to shift into second... If I rev up the engine (quick take off) it seems to help but the shifting of gears is not as smooth as I would expect it (mildly slips and kicks into second)...

The worst is when come to a complete stop ... then the transmission kicks coming down from the higher gears???

I read somewhere that this is because this transmission is a CVT type and is learning my driving habits in order to adjust itself so the vehicle becomes more fuel efficient... Not sure but if the trany is computer controlled then it must be poorly writen program...
I'm taking the car in to the dealer and will write back on the diagnostic they give me ...

SOURCE: 2001 Mitsubishi Eclipse automatic transmission

I just went through the same problem this year twice. My car started smoking some, and I notice a trial of fluid on the road both times. I'm not sure but my car problems may have started when I got my Transmission flushed.

My car has 100,000 miles and I drive my car pretty hard.

I was first told the torque converter went out. Then I was told the Fuel pump needed to be changed. After being without a car for threes months, I just brought a new transmission and had it shipped to the shop.

From researching online, I think the fragile "Wave spring" in the transmission needs to be replaced and the new version of the "Wave Spring" is a solid & thick metal ring.

Secondly, the Mechanic will need a alignment tool to put the transmission back together properly. The tool is called Sonnex or made by the company I think.

Let me know what you find out.

Also only use Transmission fluid for Mitsubishi Eclipse only.

1. Torque Converter
2. Transmission "Wave Spring" broken pieces of the wave spring may damage other parts as it flows through the system or the fuel pump I think.