03BLProtege5
Member
- :
- 2003 Mazda Protege5
First post on here, but I figure this is the best place to ask.
I have an '03 Protege5 with 236,000km on it, and I've been dealing with a P0300 misfire problem as long as I've had the car.
The misfire is extremely random, and it will be fine for about two months, and then it will misfire for about 5 seconds and come back while it's idling and warming up. Eventually it will start doing it while you're driving. The car will shutter, the light will come on, and power will back after about five seconds.
I have replaced both coils and coil boots, the plugs and wires, both oxygen sensors, the intake boot is replaced with a cold air intake, and the injectors have been tested and cleaned, the MAF, and the EGR has been bypassed, and I haven't found any vacuum leaks. I had another Protege that had a bad EGR valve, and bypassing the EGR the same way I did on this car fixed it, but it hasn't fixed anything with this car.
I also replaced the main cat with a Magnaflow because the original cat was punched out, and the precat is gone because the car has headers now.
Does anybody know what else it could be? I've been dealing with this for seven months. I'm thinking it's the idle air control or VCTS.
I have an '03 Protege5 with 236,000km on it, and I've been dealing with a P0300 misfire problem as long as I've had the car.
The misfire is extremely random, and it will be fine for about two months, and then it will misfire for about 5 seconds and come back while it's idling and warming up. Eventually it will start doing it while you're driving. The car will shutter, the light will come on, and power will back after about five seconds.
I have replaced both coils and coil boots, the plugs and wires, both oxygen sensors, the intake boot is replaced with a cold air intake, and the injectors have been tested and cleaned, the MAF, and the EGR has been bypassed, and I haven't found any vacuum leaks. I had another Protege that had a bad EGR valve, and bypassing the EGR the same way I did on this car fixed it, but it hasn't fixed anything with this car.
I also replaced the main cat with a Magnaflow because the original cat was punched out, and the precat is gone because the car has headers now.
Does anybody know what else it could be? I've been dealing with this for seven months. I'm thinking it's the idle air control or VCTS.