p0300

Year/Make/Model: 2011/Mazda/Mazdaspeed3 Mileage: 105k Location: Washington, US Concern: Rough cold start and P0300 DTC's: (please include descriptions): P0300 Modifications: Stock ECU/Tuning Software: None Tuner: None Is the concern intermittent? No Can you duplicate the concern? Yes...

ENGINE/DRIVABILITY Idled Fine, Ran fine. Stalls on Cold starts when Temp is below 55 F Year/Make/Model: 08 MazdaSpeed 3 Mileage: 1005423 Location: NW Missouri (KCMO) Concern: Misfire on start up (with smooth idle), NEW: on cold start will stall (Will start when outside temp is +55 F) DTC's...

Hi guys, Onto my 2nd Mazda 3 MPS now. Just rebuilt engine on this due to failed ring (caused by detonating) and now back together, having issues with it running properly. Getting multiple random misfires (p0300) and has no power. New Plugs gapped to 0.70mm and 2 are lean, 2 are rich. New coil...

Good evening everyone, I just bought a speed 6. Got it for 2k and loving it but the problems started coming out. So I have the standard oil consumption problem, also had a p0192 for fuel rail sensor and p0300. Changed out the sensor and code went away, I cleaned the EGR assembly and tube for...