car wont start on 1998 Toyota Camry

i turn the key and the engine turns over but wont actually start. i replaced the battery. its about 8 degrees out but i dont think its the fuel because i added iso heet just the last time a filled up about 5 days ago.

Asked by for the 1998 Toyota Camry
If you replaced the battery with no effect, then you should move up the starting/charging system to the starter, and then potentially to the ignition system. At this point, you would likely safe effort by getting a professional diagnosis.