fuel trim numbers way off car runs like crap

[kerry92gvr4]

So i just got a 95 eclipse gs automatic and it is running horrible. When you first start it in the morning it will barely idle and it will only rev to 1500- 2000 rpm. As it warms up you can rev it up higher and when its warmed all the way up it will go all the way to redline. I hooked up the scanner at my school and the fuel trims are way off (-18 to -24 ) no cel at all idles like crap, bad gas mileage. Need help thank you

 

Sounds like its running way too rich. Check fuel pressure and o2 sensor.

 

[kerry92gvr4]

well yeah i figured that but i am trying to see why it is? what is causing it? the o2 was cycling like it should. i have not checked fuel pressure yet.

 

[ktmrider]

Also check what the ECU coolant temp is reading, should be ambient or near.
When the go bad ( like reading -40 or the like ) you get a ton of extra fuel.

 

[kerry92gvr4]

do you know were it is on a 420a? i have never messed with them. this is my first na dsm