P0300 Diagnostic Code - Random Misfire
Symptoms.
Engine may stumble or miss
Engine may be hard to start
you may notice no issues
Cause
Failing spark plugs or spark plug wires
Bad coil or coil pack
Failing oxygen sensor(s)
Bad fuel injector or more than one
Stuck exhaust valve
Bad catalytic converter
EGR valve or valve passage clogging
Bad camshaft position sensor
Bad PCM or ECM
The Fix
Best first action is a tune up, new plugs, wires, inspect all hoses and wire connections then reset the code. If it returns you will need to narrow it down to a system, coils and coil packs should be tested, catalytic converters for function ( do you smell rotten eggs?). A misfire that jumps cylinders could indicate a lean condition, do you have any other codes along with the 300? this will help clue you in to the source, check valve function to make sure they are opening and closing fully.
This is probably pone of the most difficult codes to troubleshoot, so start with the basics and work your way into the more expensive options, in many cases a good old tune up solves the problem, back it up with a fuel system cleaning and see where you stand.
cylinder 5 missfire detected. could be plug, wire, or bad coil...
A bad fuel injector poppet could cause that.
you neede to have the pcm scanned it will tell you which cylinder is misfiring. most prob. cause is the coil pack on that cylinder.
P0300 = random misfire. Could be as simple as needing a tune up.
a leak in a head gasket could cause coolant to go into only one cylinder.
If the cat was damaged and restricting the exhaust it could cause a random misfire (P0300) but you would also have a severe loss of power.
It could have, Just count the spark plugs. 4 plugs= 4 cylinder 6 plugs= 6 cylinder 8 plugs= 8 cylinder
this could be a bad plugwire or sparkplug or a bad coil for cylinder 7.
this could be a coil or the modgul in the dist or broken rotor or bad coil packs depending on what u have also the knock senser could cause this hope this helps
Could be, Out of adjustment Worn camshaft Worn lifters Worn pushrods Worn rockers All of the above.
Anything that could cause a cylinder misfire can cause the check engine light to flash. A restricted fuel filter is one.Anything that could cause a cylinder misfire can cause the check engine light to flash. A restricted fuel filter is one.
trottle control module