Question about Cars & Trucks
I need to know year--make--model?
Did you visually check for spark at the spark plugs? If no spark, did you check primary voltage to coil pack?
Engine cranking did you use a gage and check proper fuel pressure and fuel injector pulse? If your missing everything, check for rpm signal.
Any applicable trouble codes?
Posted on Apr 15, 2017
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Posted on Jan 02, 2017
SOURCE: p0301 trouble code
The misfire is detected by the misfire monitor as a slight change in
engine speed which the PCM calculates back to a particular cylinder.
The monitor is active continuously, but associates problems into 3
types. Two of the types are monitored on successive trips. The first
trip the monitor detects a misfire it sets a pending code but not the
MIL light. If on the second trip the same problem occurs the DTC code
is set as current problem and sets the MIL light on. The MIL will stay
on untill the DTC is deleted. The remaining type is a most sever case
and signals the possibility of cat damage. In this case the misfire
monitor identifies the problem and the PCM determines it to be severe
and immediately sets the DTC as current and the MIL light to flash at a
rate of 1 per second until the condition is no longer present, at which
time the MIL stays on steady.
So once the P0301 is set it never turns off, except by code deletion procedure.
I think a lean burn condition could cause a misfire, but probably not from a PCV problem which should affect all cylinders equally. There would likely need to be another problem with that cylinder or intake or ...... .
Posted on May 02, 2009
About the only things that you have not changed that would cause that problem are the fuel pump, the ECM, (Engine Control Module) or if your vehicle has one it could be the ignition module, and here is an image of what the ignition module will look like, and not all applications will use one.
Posted on Jun 10, 2010
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