Hi I have a 2007 Chevy Optra 5. The engine light is on, sometimes flashing, sometimes steady. The light originally came on a day after it came out of a GM garage, after they had replaced the crankshaft. They found there was a misfire code and said the ignition coil had to be replaced. I didn't fix it right away, and the light had stayed off for quite awhile after it had been reset. It did however come on again, This time I pulled the codes off, which were; P0300 P0301 P0304 Again misfire codes. So I replaced the ignition coil, light came back on, replaced the spark plugs, and the light came back on again. Before I replace the wires, is there anything else that could be causing the light to come on due to a misfire.
SOURCE: Misfire with error codes P0300,P0302,P01303, P0102, P0748
have you checked the wires for holes.
SOURCE: Check engine light
A multi misfire may mean that one or more of the following has happened:
Faulty spark plug or wires, Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector(s), Stuck/blocked EGR valve / passages, Faulty camshaft position sensor, Defective computer.
The engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wire, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
Good luck and hope this information helps, keep me posted, be glad to help you get the truck running 100% again. Not sure if your running a K&N air filter, and if you are there may be a flim of oil on the MAF sensor that is making you run lean. You may want to spray down the MAF sensor with a can of MAF cleaner.
SOURCE: 07 lexus rx 350 with check engine light code p0304
Hi, did you ever get an answer? I have the same issue. Thanks.
SOURCE: 1999 Ford Taurus 3.0L V6 24V DOHC Duratec Engine
i would check the plug wires and the coils you check the plug wires for bad spots at night start the motor up and look at the plugs if you see a spark arch out the wire and to a peace of metal then the plug wires need to be replace.
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