2001 Mazda Millenia Rough idle at start

RDONNER10

MEMBER
2001 MAZDA MILLENIA
6 CYL
FWD
AUTOMATIC
148,000 MILES

Left the car in the garage for 2 days. Started the car, ran very rough with lots of exhause smoke and smell. Gradually got rpm in the 3500 range, smoothed out. Back down to idle. Put it in reverse to back out and it stalled and would not restart. Waited 20 minutes. Attempted re-start and it started right up and ran fine.

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Next time it refuses to start don't wait for it to make up its mind-do below immediately to determine if its fuel or spark problem.

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, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if so, 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, cap and rotor, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing.