Question about Chevrolet Impala
Posted by Anonymous on
The error code Stands for: random/multiple cylinder misfire detected. sounds like you just forgot to reset the error code once you repaired the issue.... hmmm,
A P0300 OBD 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 may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present
Causes a code P0300 may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
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.
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Posted on Jan 03, 2011
I fought this problem for 7 months and finally I found the problem it was a very simple very cheap fix. The fuel supply lines that connect to the fuel rails are a press fit assembly. I push down on the rear one just checking for anything loose when fuel squirted out and dripped, but only by pushing down on the fitting. under the fitting is a plastic seat. The rear fuel rail has a 3/8" seat and the front has a 5/16" seat. auto zone sells the seats in pack of 10 for 5 bucks. Problem solved.
Posted on Jun 26, 2013
P0300 it means you have multiple missfires if you have a coil pack on this model it could be a bad coil or timing is off can do then same but usually a p0300 or example p0301 is a misfire on number 1 cyl as well p0302 and so on you should of stopped after plugs and wires this usally solves the problem or even the pcv valve now i would go back to the first step code p0300 they have precedures to follow but you do not have to replace the engine like they suggest maybe a simple compression test would show if the motor is sick but i would go back to basics and start new before going in head first
Posted on Jan 03, 2011
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Posted on Jan 02, 2017
This is a easy fix. You need new coils. The coils have small silicone grommets that loose their ability to shield the high voltage and the coil starts to break down internal. Get you 3 new coils cost about $30.00 each. Buy you some dielectric grease, or you can use brake pad stop squeal grease. Coat the seals real good with the grease before you put it back together and its fixed. Number your wires and or take a picture, before you take it apart. Do not get the wires mixed up and it is a easy fix.
Posted on Jan 03, 2011
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