Question about 2005 Chevrolet Impala
Basically this means that the the car's computer has detected that not all
of the engine's cylinders are firing properly.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.
Symptoms Symptoms may include:
If there are symptoms such as 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 wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases 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.
Posted on May 26, 2011
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Posted on Jan 02, 2017
SOURCE: i have a 2005 chevy
A plugg catalytic you will get a MAF code relation, The rotten egg you smell is a lean misfire smell, you did right when you inspected for a rupture FPR but a low fuel pressure or a open regulator can do this even if you disconnect the FPR vacuum line you still can have low fuel pressure going through due to a ruptured internal regulator, you are going to have to try to see if you can plug the return line and see if the problem persist or have fuel pressure measured. Also see if you EGR is open that is if you are equip with a EGR, the 3.4 if you have a camshaft actuator can also set a misfire random code
Posted on May 26, 2011
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