Fuel Issue

RANDEL LAAKE

MEMBER
1992 MAZDA MIATA
1.6L
4 CYL
2WD
MANUAL
200,056 MILES

I bought the car listed above that was Turbo'd, car ran great when driving it for a week as a daily. Then one day, car shut off when coming to a stop, and wouldn't turn back on but eventually was able to pump the gas pedal and get it back home.

Since then car hasn't been able to maintain an idle. I can go outside, turn the car on and it'll sound fine. After a couple minutes the car will idle worse and worse until it just turns off. If I turn the car on, and even lightly touch the gas pedal, the idle will do the same thing and idle back and forth from 200 to 600 rpm range.

I was thinking it would be something fuel related like injectors or something but I have no idea how I would even diagnose this issue. I've replaced spark plugs and spark plug wires. All fluids are fairly new and look like they should. Car has fresh 93 pump gas.

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1 Reply

DANNY L

MECHANIC
5,648 POSTS

Hello, I'm Danny.

Have you tested the fuel pressure ? If you don't have a fuel pressure tester then most auto parts stores have a tool loaner program and can rent you one. Here is a tutorial showing what's involved:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Sounds like a weak/defective fuel pump. Get back to me after a fuel pressure test. I've attached a picture below with fuel system specifications.Hope this helps and thanks for using 2CarPros.
Danny-

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