JustAlex

So i had a problem that when i hit 4.500rpm, my car loses signal like boost cut and i was "ok i need to adjust my crank sensor cuz i just change it". I did it but engine was still running and i moved the sensor way to far and car shut off. After that i tryed to start it but no luck.
- Car have spark but no fuel
- mega ecu shows that i have rpm signal
When i tryed to start the fuel pump by the diagnostic box by a wire, it did start but i didnt had rpm reading on my dash and battery light was on. Can anyone help?

Z_WAAAAAZ

Can’t easily tell from the way the post was written, did you readjust the crank sensor after you stalled the car adjusting it? Was the crank sensor replaced the first time due to the same issue? Need more information here.

JustAlex

Yes i did readjust the sensor, and yes i replaced it bc it didnt wont to start.

Z_WAAAAAZ

Sounds like there’s multiple problems going on. How have you confirmed the car has no fuel delivery? Can you hear the fuel pump prime with the key on and engine off? Fuel pump and injector fuses are both intact?

I’m having trouble telling, the title says your car is an NB with a 1.6 in it? If that’s the case, I’d also get a voltmeter and check if you have an intermittent short or open in the wiring running from your CAS to your ECU. Set the meter to resistance and check for continuity on the signal CAS signal circuit from the sensor to the ECU and have someone watch it while you wiggle and twist different parts of the wiring harness. If the meter shows an open at any point, you have your culprit. Repeat this for the other circuits as well.

Z_WAAAAAZ

Seems weird to have a 1.6-swapped NB though… Still, if your car is a 1.8, the same procedure will apply with your cam and crank position sensors.

JustAlex

Its a regular MX5 1998 NB 1.6 110hp whit mega ecu and turbo. Yes im 100%there is no fuel cuz i removed the fuel hose to the fuel rail and when i crank it ,there was no fuel coming. When i did the thing whit the wire in the diagnostic box, car started normaly. I think im missing signal to the fuel pump.

Z_WAAAAAZ

Alright, the best way to check if the fuel pump is receiving power would be to measure voltage right at the fuel pump connector. It's pretty easy to get to. You'll have to move the carpet on the rear deck and remove a metal panel held on by a handful of screws. There's plenty of videos on how to get to the fuel pump on YouTube. Check if the fuel pump has power. If not, the fuel pump relay is a common failure point. You should also check the fuel pump fuse as well. If that's blown, you have a short in the system and the relay is likely ok.