1987 Mazda RX7 trouble starting

MMURRAYJ

MEMBER
1987 MAZDA RX7

Engine Mechanical problem
1987 Mazda RX7 Two Wheel Drive Manual 104000 miles

i have a 1987 mazda rx7 non turbo 1.3 liter rotary engine. If I leave it alone for a couple days it will start and run for no more than 30 secs very roughly then it dies. After that it starts and dies immediately. I have replaced the fuel filter, fuel pump, fuel strainer and fuel pressure regulator. I'm not sure if its a fuel issue or a connection issue.

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Lets do below for a start to determine if its fuel or spark related issue and get back asap.

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it