Where is the starter fuse and relay on 1990 Mazda Miata?

SOURCE: 1990-Mazda miata

you have to reset your computer..it is kind of tricky..you have to pump the gas pedal three times on the third time hold it to the floor turn the ignition to on position then off then start the car it should reset it..

SOURCE: mazd mpv cranks sometimes starts sometimes nothing

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

SOURCE: cannot start 1993 mazda miata

you may want to check your timing

SOURCE: My 1992 Mx5 Miata just wont start!!

First off it won't turn over without pressing the clutch in. If all fuses are good and you have a good battery and you hear a click it is possible the starter or it could be the ECU. I just replaced a ECU in my 1990 miata because it only would fire the sparkplugs after releasing the ign. switch and then ALL plugs would fire at the same time.

SOURCE: 1999 mx-5 mazda miata- turns

Check your diagnostics in case they can reveal something...

If you're driving an American model WITH a check engine light on the dash, put a paper clip between terminal 10 and GND in your diagnostic box (right side of the engine bay near the air intake - has a big DIAGNOSTIC written on it). Then hop into your car, turn the key to ON (but don't start the engine). The light should go on steady - then off for 4 seconds. After this any diagnostic codes will be displayed. Long flashes are for the first digit in a two digit code - short flashes are the second digit. There will be a 4 second pause between each code AND the codes will repeat. If you get codes, record them and post them and I'll see what I can suggest.

Otherwise, check your spark plugs and wires - replace them if necessary - check the coil packs and the connections thoroughly. Poor or no ignition is most likely your problem.

Also check your air intake, filter and check and clean your throttle body.

I'm betting you'll find an issue in the ignition system though.

Hope this helps,
Sherwin