Trying to find an issue with my 1990 Miata engine using the OBD via the "Check Engine light" light flasshing code and using the "diagnostic box" under hood drivers side with a jumper wire and a second jumper made out of a LED light wih a resistor per instructions on Miatanet to flash a code. I cleared any potential codes thru the disconnect negative battery post, step on brake pedal process. Started the engine, stopped the engine several times with the fault occuring during each engine run time frame. Neither the check engine light or diagnostic box will provide any fault code.
Thoughts if you have tried this process, successful or not successful????
Thanl you