ok so check this out. My car is losing coolant like crazy, like i have to fill it all the way up every two to three days. i don't see any leaks under the car. and my water temp stays anywhere from 120 degrees to 190 degrees. mostly 120. is that a good operating temp? it seems really low. i just swapped the five speed tranny (had the busted *** 4 speed) and now it kinda lags a little, like what happens when you have a bad 02 sensor. i can't tell if its a 02 sensor or not cuz i can't reset my ecu. i pull the fuse and let it sit like a minute and put it back in and the ecu still reads 1 and 16. 02 sensor and fuel injector. i don't know where to start, i checked compression and it was good, no oil in the cylinders, so i don't think its a head gasket.

 

Did you check the fuel injectors? If it's throwing a code there could be a problem. Also check your O2 sensor if you haven't. 120 seems like a really low operating temperature to me, do you have a thermostat? If you do you might check to see if it's stuck open.

 

thermostat is in and good, the only way i know to check the fuel injectors is to hold a screw driver to them and see if they are ticking, the are. and its a brand new 02 sensor.

 

if the compression check was fine then you have a leak some where. since it is not being burnt then it is leaking. if you cant find find the leak then go buy a leak tester. which is dye and a black light. this should show you where it is leaking.