hi anyone have any ideas why a 1500 323f should tick over at 750 rpm and sometimes but not always, when the lights are on its 12-1300? mazda say this is normal but i dont think so. cheers

at a guess (as i ain't no sparky) i would say that it could be suffin to do with the higher current being drawn, which in turn means that the engine revs pic up for the alternator to supply a higher current?

that seems the only logical explanation to me, though the lights should run off the battery. Maybe ya battery is gettin low?

like i say i don't know much bout the lectrics on these things but that seems like the only logical explanation to me. I could be completely wrong of course.

Arty

mine starts at 1500rpm in a mornin when engine is cold, but as engine warms up, idle revs drop.
it does this to warm the engine up quicker

that'll probably be ya auto choke, to stop ya engine cuttin out in the cold

Arty

either that or you have your fans or AC on, and the ECU is telling the engine to pick up the revs cos your drawing more current from the battery... same as when your radiator fan comes on...

the revs change when A/C is on due to the air con compressor clutch is in with the pulleys on he drive belt, raising the revs prevents you from loosing power when its on, not sure on mazdas, but on jags and aston martins they do, thats where i work.