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P0300 is multiple cylinder misfire, meaning a engine miss is detected on more then 1 cylinder, I would have the codes scanned at auto part store to know for sure which cylinders are actually missing, if there are 2 cylinders that are missing and they are side by side, such as cyl. 1,3. Or 3,5. If so its possible u have a blown head gasket blowing in between the 2 cylinders.. 1st double check that your wires are installed correctly, the coil packs have numbers on them to assure proper location.. Note the rear head has cylinder 1 3 and 5. Some people get that confused.. Providing you have a 3.3, 3.8 or 3.1 liter engine.
Is there a code stored in the PCM isolating #3 cylinder? When was the last time the spark plugs were inspected or replaced? How many miles are on your vehicle?
CYLINDER 3 MISFIRING. MEANS NOT FIRING .CYLINDER 3 IS MISSING FIRE.COULD BE FAULTY OR DIRTY FUEL INJECTOR.YOU COULD HAVE BAD SPARK PLUG OR COIL AND WIRE.CLEAN FUEL INJECTORS CHANGE PLUGS AND COIL TO NUMBER 3 CYLINDER .WHEN YOU DO A LITTLE TUNE UP.THAT WAY YOU WILL KNOW IF YOU HAVE A MECHANICAL PROBLEM TO 3 CYLINDER LIKE LOW COMPRESSION.LEAKING INTAKE AT 3 CYLINDER OR BURNED OUT VALVE.
first code means random/multiple misfire cylinder (s) detected
second code means misfire detected number 1 cylinder, third code, miss=fire number 3 cylinder fourth code misfire number 4 cylinder
causes can be spark plugs, HT leads, ignition coils, injector, wiring fault, low compression/ engine mechanical fault
Number 3 is the 3rd plug back on the passenger side. Coils are notorious for going bad, I would recommend replacing the spark plugs, while you are there. Use Auto Lite, or Motorcraft Platinum Spark plugs only.
CYLINDER NUMBER 5 IS STANDING IN FRONT OF VECHICLE IT WILL BE THE 5 CYLINDER COUNTING FRONT TO THE BACK CYLINDERS IS IN ORDER 1 2 3 4 5 6 THAT YOUR CYLINDER ORDER. YOU HAVE A INLINE 6 CYLINDER ENGINE.YOUR MISS FIRE COULD BE THE COIL - SPARK PLUG - CLOGGED OR FAULTY FUEL INJECTOR. ALSO INTAKE MANIFOLD VACUUM LEAK OR SLIGHT HEAD GASKET LEAK WILL CAUSE MISFIRE.
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