97 Protege 1.5L DOHC won't start when it is cold outside. Theengine turns over but never fires. You can push start the car and it will start right up and then run fine until it sits again for a few hours. I have replaced plugs, wires, cap and rotor, battery, starter, fuel and air filters, and MAF. Timing checks out OK as does fuel pump and fuel pressure pressure regulator. Any ideas? Thanks for your help. Phillip

 

I AM HAVING THE SAME PROBLEM,I HAVE ALSO CHANGED THE COOLANT TEMP SENSOR/AIR INTAKE SENSOR/TIMING ADVANCED.THE ONLY OTHER THING THAT MAZDA MECHANIC TOLD ME TO CHECK WAS THE GAP ON THE CRANK SENSOR.
LATTER TODAY I HAVE TO GET HER IN THE GARAGE TO CHECK IT I WILL LET YOU KNOW THE OUTCOME AND ANYTHING ELSE I CAN FIND.
AFTER YOU GET IT WARMED UP DO SHE START OK THEN?THE COLDER IT IS OUTSIDE DO IT MAKE HER A LOT HARDER TO START?TODAY IT IS ABOUT -30 MINE WOULDN'T EVEN GO WITH A BOOST.

 

Thanks for answering. I will have to have my crank sensor checked also. The coldest we have been has only been about 25. We haven't had any problem getting it going at that temperature. It still baffles me. Phillip