I have a 03 mazda mpv crank but no start - 2003 Mazda MPV

SOURCE: mazd mpv cranks sometimes starts sometimes nothing

I would check the ignition control module. It may be firing and missing intermitinly

SOURCE: Wet floorboard on driver's side of '03 Mazda MPV van.

air conditioner

SOURCE: how do I replace front rotors on a '03 Mazda mpv

MOST DO IT YOURSELF BOOKS EXPLAIN THE BRAKE PAD REMOVAL. WHEN THE CALIPER IS OFF THE ROTOR IS HELD ON BY TWO PHILLIPS SCREWS TO KEEP THINGS "TOGETHER" ON THE HUB. IT MAY ALSO BE TIGHT TO THE HUB, BUT IT WILL COME OFF.
ALWAYS REPLACE WITH NEW ROTORS SINCE MOST OF THE WORK IS DONE BY THE FRONT (DISK) BRAKES. SHOPS LIKE TO "TURN" OR RESURFACE ROTORS BECAUSE THEY HAVE THE MACHINE PAID FOR AND CAN CHARGE YOU THE PRICE OF NEW ROTORS AT A PARTS STORE FOR A LITTLE LABOR.

Testimonial: "I found that there were no screws to remove, however I did find that if you use the screw hole to screw in a 5/16-18 bolt the rotor pops right off"

SOURCE: mazda mpv 2000 will crank but not start, Battery

cam sensor?

SOURCE: hard starting mazda mpv 2003

Hi
In most case's it will be the spark plugs which will need to be replaced. Try to do these asap as it will lead to more further problems. If you have done this then check when air/fuel filters were last replaced and replace these.

Hope this helps, let me know how you get on.