1991 Mazda MX5 won't start

1991 MAZDA MX5
86,000 MILES • 4 CYL • 2WD • MANUAL
Avatar
RAYCHITS
  • MEMBER
  • 1 POST
I have plenty of spark! When I jump fuel pump up front with jumper wire you can hear pump running! I replaced ECU new fuel pump and new fuel pump relay! Still won't start plenty of spark! I cleaned all ground contacts that I can find still won't start! I also replaced MAS still won't start! I have replaced the four injectors! I check all fuses that are good! When I try to start without jumper wire no fuel pressure! When I jump fuel pump with jumper wire engine will run as long as I spray gas into throttle body! What am I missing!
Dec 25, 2007 at 10:55 AM
Advertisement
Avatar
RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Check for an injector/s pulse. You got spark and fuel pressure-when injector/s are not opening it will not give fuel to the combustion chamber. The new fuel pump did you check its pressure-could be new but defective not pushing the correct pressure.
Dec 25, 2007 at 1:03 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.