p0300 code

[2gGSXEclipse]

Hey guys,
My car rencently stop running while in the middle of driving it. I replaced the alternator and it runs but not properly. #s 2 and 4 are not firing properly and i am getting the code p0300 random misfire. I tried a new coil for those 2 cylinders and replaced the plugs and wires. Wondering if anyone knew anything else that could be wrong with it. Possibly a ICM or something like this. If you guys know anything please let me know

Thanks,
Dean Iverson

 

[1ghaaaaaw]

try getting the ecu checked out,, we had a car do the same thing and and it ended up being a bad board, just an idea.

 

[TALONTRAX]

Yes it could be the transistor (icm.or module). Check to see if there is injector pulse at all 4 injectors also to eliminate a driver issue in the ecu . . .

 

[chico904]

Is the alternator you put in new? If not test the amount of A/C voltage being produced by the alternator with a meter. It should read near or over 500mV of A/C voltage.

 

[xlMcMlx DsM]

Voltage drop test the power wire to the coil for cylinder's 2 and 4. Does it miss at idle?