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Posted on Jan 02, 2017
The vehicle can misfire for many different reasons. Your first step should be to check to make sure the spark is getting to the spark plugs. Next make sure those cylinders are getting fuel. If all those check out then you will need to check for compression loss. All of these procedures and more can be found at www.autozone.com
Posted on Oct 28, 2009
These are misfire codes.This means that your vehicle is missing.The 300 is a random misfire and the 305 is for cylinder 5,and the 306 is for cylinder number 6.Check the plugs if they are good then you could have bad coils.They are top of the plugs.Hope this helps.Good luck.
Posted on Feb 25, 2010
SOURCE: trouble codes for saturn ls2
P0300 Multiple Cylinder Misfire Detected
P0306 Cylinder 6 Misfire Detected
P0451 EVAP Pressure Sensor Range/Performance
I have no idea what those last two are. Typo, maybe?
Your first two codes could be caused by old spark plugs and/or leaking plug wires.
Your EVAP code could be a bad fuel tank pressure sensor or a malfunctioning EVAP system. With that code, if you remove your fuel cap and get a whoosing sound, then it is an issue with your EVAP system not properly venting the tank. If you don't get that sound, then the tank pressure sensor is bad.
Posted on Mar 05, 2010
If you get
error codes and
you have an engine that misfires or runs rough, it can be the injector for that
cylinder or the coil pack. The P0300 code is a random misfire code and may or
may not be the above. All the other messages are for misfire of a particular
cylinder indicated by the last digit.
Test the coil pack by switching it to another spark plug and
see if the problem follows to that cylinder.
If that makes no difference, it is very likely the injector.
Disconnect the injector connector of the same cylinder and measure the
resistance. It should be 13.5 to 14.2 ohms at 70 degrees temp. It can be up to
16 ohms if the engine is hot. If you see a really high resistance or an open or
short then you can try to change the injector. If not, you can remove the fuel
rail on that side and switch the injector to another cylinder and see if the
problem follows to that cylinder.
need a 22mm wrench to remove the fuel pressure regulator. The other connections
are std. When all screws are removed, GENTLY wiggle the rail up and guide it
smoothly out. Don't put any sideward stress on the injector bodies.
Here is how to identify cylinders
Front of vehicle ^
All of the
injector connectors have a Black with red stripe wire. The corresponding other
wire color on the injector connector that matches with above are
Posted on Mar 08, 2011
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